JPH05129980A - Wireless communication device having a planar antenna - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to reduce the transmission loss of the high-frequency line on the antenna substrate and increase the number of antenna elements, thereby improving the performance of the planar antenna. Is to provide a wireless communication device. [Structure] On a back surface of a planar antenna formed by disposing a plurality of antenna elements ANT1 to ANTn on a transmitting antenna substrate 31, a plurality of modulation circuits MOD1 to MODn are dispersed in proximity to the antenna elements ANT1 to ANTn. These modulation circuits MOD1 to MODn and the corresponding antenna elements are connected to each other via a high-frequency line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device used in a wireless communication system such as a satellite communication system,
In particular, the present invention relates to a wireless communication device having a planar antenna.

[0002]

2. Description of the Related Art In recent years, various communication systems using communication satellites have been operated. In the earth station device of this type of communication system, a reflector antenna such as a parabolic antenna is generally widely used as the antenna device. In particular, recently, with the start of operation of broadcasting satellites (BS), various small earth stations including general public, so-called VSAT (Very
Small-diameter offset parabolic antennas for small aperture terminals are rapidly spreading.

By the way, in such a reflector antenna widely used as an antenna for a satellite earth station, it is necessary to take measures against the influence of strong wind when installing the reflector antenna because of its structure. For example, when the offset parabola antenna is installed on the rooftop of a tenant building or the like with the opening of the small earth station, a very wide antenna installation space must be secured on the floor surface. The reason is that the antenna body does not take up much space during installation, but when the antenna is pushed by wind pressure, the floor of the building supporting the antenna is very stressed, so the weight equivalent to that stress is applied. This is because it is equivalently necessary to make the installation space very large.

As described above, when the antenna is set up on the roof of a building, there is a problem that a very wide space is occupied for the antenna installation. Due to such circumstances, there is a case where the antenna installation permission is not obtained in the tenant building and the like, and as a result, the installation of the antenna may have to be abandoned.

In order to solve the above problems, it has been considered to use a plane antenna. Planar antennas usually have antenna elements arranged in a matrix on a printed wiring board.
The plurality of antenna elements are configured to have desired directivity and gain. By mounting such a plane antenna on the wall surface of a building as shown in FIG. 6, for example, the influence of the wind pressure as described above can be almost ignored. Therefore, especially in an environment where wind pressure resistance is required, such as on the rooftop of a high-rise building, if the above-mentioned planar antenna is used, it is sufficient to secure an area for the planar antenna body only on the wall surface of the building when installing. This solves the problem that a huge space is occupied for installing the antenna.

[0006]

However, the planar antenna having such an advantage that it is hardly affected by wind pressure has the following problems to be solved. That is,
For example, the modulated wave output from the transmission modulation stage at the time of transmission is fed from the feeding end to each of the above antenna elements via different strip lines. However, the modulated wave output from the modulation stage has a high frequency and is greatly attenuated by the transmission loss (feeding loss) of the strip line before it reaches each antenna element. Therefore, it is generally preferable that the strip line length is as short as possible.

On the other hand, in order to improve the performance of the planar antenna, if the number of antenna elements arranged on the printed wiring board is increased and the size of the antenna is increased, the number of antenna elements moving away from the modulation section is increased accordingly. As the antenna element is farther from the modulation stage, the strip line connecting between the antenna elements becomes longer, and the influence of the power feeding loss cannot be ignored. That is, even if the number of antenna elements is increased unnecessarily, there is a possibility that the transmission power is not sufficiently supplied to the antenna elements far from the modulation stage. Further, regarding reception, the received signal input from the antenna element is considerably attenuated on the strip line by the time it reaches the frequency conversion unit.

As described above, as the antenna element becomes farther away from the radio frequency stage as the antenna element becomes larger, the signal attenuation on the strip line becomes more remarkable. Therefore, the planar antenna should be practically small. Therefore, the conventional planar antenna cannot sufficiently satisfy the required performance as a satellite communication antenna.

Therefore, an object of the present invention is to reduce transmission loss in a high frequency line and increase the number of antenna elements,
Accordingly, it is an object of the present invention to provide a wireless communication device including a planar antenna that can improve the performance of the planar antenna.

Another object of the present invention is to make it possible to easily change the directivity of the planar antenna so that the planar antenna can be easily and reliably operated with respect to a plurality of partner stations without mechanically moving the planar antenna. Another object of the present invention is to provide a wireless communication device equipped with a planar antenna that can be captured.

[0011]

In order to achieve the above object, the present invention provides a wireless communication device having a planar antenna in which a plurality of antenna elements are dispersedly arranged on a substrate, and wireless transmission is performed from a transmission baseband circuit. At least the wireless transmission high-frequency circuits among the circuits constituting the transmission system up to the high-frequency circuit are arranged in a distributed manner on the substrate in the state of being close to the plurality of antenna elements, and correspond to these wireless transmission high-frequency circuits. The antenna element is connected via a high-frequency line.

The present invention further comprises transmission directivity control means,
At least one of the phase and amplitude of the signal supplied to each radio transmission high-frequency circuit is variably controlled by the transmission directivity control means according to the arrangement position of the corresponding antenna element, and the transmission directivity by each antenna element is controlled. Another feature is that the sex is variable.

Further, the present invention further comprises, as the transmission baseband circuit, carrier wave reference signal generating means for generating a reference signal having a frequency lower than that of a carrier wave and supplying the reference signal to a radio transmission high frequency circuit. It is also characterized in that it is provided with a multiplication means for frequency-multiplying the reference signal transmitted from the reference signal generation means to generate a carrier wave.

According to another aspect of the present invention, in a radio communication device having a planar antenna in which a plurality of antenna elements are dispersedly arranged on a substrate, a reception system from a radio reception high frequency circuit to a reception baseband circuit is constituted. At least the radio receiving high frequency circuit of each circuit is disposed in a distributed manner on the substrate in the state of being close to the plurality of antenna elements, and these radio receiving high frequency circuits and corresponding antenna elements are provided via a high frequency line. It was designed to be connected.

Still another aspect of the present invention is provided with reception directivity control means, and at least one of the phase and amplitude of a signal passing through or after passing through each of the radio receiving high frequency circuits is handled by the reception directivity control means. It is also characterized in that the reception directivity by each of the antenna elements is varied by variably controlling each antenna element according to the arrangement position of the antenna element.

Still another aspect of the present invention is the reception baseband circuit, wherein a reference signal having a frequency lower than that of a local oscillation signal required for frequency conversion of a reception high frequency into an intermediate frequency signal or a baseband signal is generated and wirelessly received. A local oscillation reference signal generating means for supplying to the high frequency circuit is provided, and a multiplying means for frequency-multiplying the reference signal transmitted from the local oscillation reference signal generating means to generate a local oscillation signal is provided as the radio receiving high frequency circuit. It is also characterized.

[0017]

As a result of taking the above measures, the following effects occur. That is, since a plurality of wireless high frequency circuits are prepared for each antenna element and these wireless high frequency circuits are disposed on the substrate in the state of being close to each antenna element, each antenna element corresponds to this element. The lengths of the high-frequency lines that connect to the wireless high-frequency circuit are very short. Therefore, the power feeding loss between the antenna element and the radio frequency circuit is extremely small and substantially uniform regardless of the array state and the number of arrayed antenna elements. Therefore, it is possible to prevent a problem that an antenna element that does not sufficiently supply the transmission power is generated, and it is possible to improve the performance.

Further, by controlling at least one of the phase and the amplitude of the signal transmitted and received by each antenna element in accordance with the arrangement position of each antenna element, the directivity of the antenna can be arbitrarily changed during transmission and reception. This makes it possible to easily and selectively capture a plurality of partner stations without mechanically moving the antenna.

Further, the low-frequency local oscillation reference signal and carrier reference signal generated from the baseband circuit are frequency-multiplied by each radio high-frequency circuit and converted into the required local oscillation signal and carrier signal. That is, it is not necessary to generate and supply a high-frequency local oscillation signal and a carrier wave signal from the baseband circuit, so that it is possible to reduce the transmission loss between the baseband circuit and the wireless high-frequency circuit.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment in which the present invention is applied to a radio transmitter used as an earth station of a satellite communication system will be described.

FIG. 1 is a perspective view showing a partially cut-away external view of an antenna section of a radio transmitting apparatus according to an embodiment of the present invention. In the figure, reference numeral 31 is an antenna substrate of the wireless transmission device.

First, a plurality of antenna elements ANT1 to ANTn are arranged in a matrix on the surface of a flat antenna substrate 31. Further, on the back surface of the antenna substrate 31, a plurality of modulation circuits MOD1 to MODn are arranged corresponding to each of the above antenna elements. Each of these modulation circuits MOD to MODn is configured by an integrated circuit (MMIC) that is made into one chip. The antenna elements and the modulation circuit are connected to each other by a strip line of a minute length (not shown). Reference numeral 32 is a signal line for supplying a transmission baseband signal from the transmission baseband signal processing unit, which will be described later, to each of the modulation circuits.

FIG. 2 is a block diagram showing the circuit arrangement of the radio transmitting apparatus according to this embodiment. In the figure, this device is composed of a transmission baseband processing unit 1 and an antenna unit 2.

The transmission baseband processing section 1 includes a reference signal generation circuit 1a and a transmission baseband control circuit 1b. The reference signal generation circuit 1a generates a predetermined carrier wave reference signal in synchronization with the transmission, and supplies the generated carrier wave reference signal to a plurality of modulation circuits described later.
The transmission baseband control circuit 1b first performs predetermined digital signal processing on the transmission data input from a terminal device (not shown) to generate I and Q transmission baseband signals. Then, the transmission baseband signals are branched into the number of the antenna elements ANT1 to ANTn, and the phase control is performed so that the transmission wave beam of the antenna is directed toward the satellite with respect to the branched transmission baseband signal pairs. And the phase-controlled transmit baseband signal pair I
1 (t), Q1 (t) to In (t), Qn (t) are supplied to the modulation circuits MOD1 to MODn, respectively.

The antenna section 2 includes a plurality of antenna elements ANT1 to ANTn and modulation circuits MOD1 to MOD paired with the antenna elements ANT1 to ANTn as shown in FIG.
n and. These modulation circuits MOD1 to MOD
As shown in FIG. 4, each n is a frequency multiplier 11, a bandpass filter 12, a 90 ° distributor 13, an I signal mixer 14, a Q signal mixer 15, and a 0 ° combiner 16.
It has and. The frequency multiplier 11 multiplies the carrier reference signal output from the reference signal generation circuit 1a by M and then amplifies the carrier reference signal to output a high frequency carrier signal. The band pass filter 12 removes unnecessary components of the carrier signal output from the frequency multiplier 11. The 90 ° distributor 13 distributes the carrier signal output from the band-pass filter 12 into two signals orthogonal to each other, and then the I-data mixer 1
4 and Q data mixer 15 respectively. I
The data mixer 14 and the Q data mixer 15 respectively apply the transmission baseband control circuit 1b to the carrier signal.
From the transmitted baseband signal I (t) or Q
Each of (t) is mixed, and the modulated wave signal whose phase is modulated by this is output. The 0 ° combiner 16 combines the two series of modulated wave signals output from the I data mixer 14 and the Q data mixer 15 and outputs a QPSK modulated wave signal. Antenna elements ANT1 to ANT
n is the QPSK output from the 0 ° combiner 16 respectively
The modulated wave signal is converted into a transmission wave and radiated in the air. Next, the operation of the wireless transmission device configured as described above will be described.

It is assumed that transmission data is input from the terminal device to the transmission baseband control circuit 1b with the start of communication. Then, in the transmission baseband control circuit 1b, first, the transmission data is subjected to digital signal processing, whereby two transmission baseband signals corresponding to the I axis and the Q axis are generated. Then, each of the transmission baseband signals is transmitted to the modulation circuits MOD1 to M
After branching into the number n of ODn, phase control for adjusting the direction of the transmission beam of the antenna unit 2 to the direction of the communication satellite is performed on these transmission baseband signals. Then, these phase-controlled transmission baseband signal pairs I1 (t), Q1 (t) to In (t), Qn
(T) is supplied to the corresponding modulation circuits via the signal lines.

On the other hand, in each of the modulation circuits MOD1 to MODn, the carrier reference signal supplied from the reference signal generation circuit 1a is multiplied by the frequency multiplier 11 to become a carrier signal, and this carrier signal is filtered by the band pass filter 12. After that, the 90 ° distributor 13 distributes the two carrier signals which are orthogonal to each other, and inputs them to the I data mixer 14 and the Q data mixer 15, respectively. And these I
In the data mixer 14, the carrier signal is the transmission baseband signals I1 (t), Q1 (t) to In.
(T) and Qn (t) are mixed with each other, and thereby a quadrature phase modulated carrier signal is obtained. Then, the modulated wave signals are combined by the 0 ° combiner 16 and supplied to the antenna elements ANT1 to ANTn, respectively, and transmitted from these antenna elements ANT1 to ANTn toward the communication satellite.

As described above, according to this embodiment, the modulation circuits MOD1 to MODn whose number is equal to the number n of antenna elements arranged on the surface of the planar antenna are set to the antenna elements ANT1 to ANT.
Since it is provided on the back surface of the substrate close to NTn,
Each antenna element ANT1 to ANTn and modulation circuit MOD1
The length of the strip line connecting to MODn is always constant and very short regardless of the arrangement state and the number of arrangement of the antenna elements ANT1 to ANTn. Therefore, the feed loss is almost negligible on all of the above strip lines, which causes the antenna elements ANT1 to ANT1 to
Even if the number of ANTn is increased and the size of the antenna is increased, it is possible to prevent a problem that an antenna element in which transmission power is not sufficiently supplied is generated. Therefore, it becomes possible to provide a large-sized and high-performance planar antenna.

Further, since the frequency multiplier 11 for multiplying and amplifying the carrier wave reference signal is provided in each of the modulation circuits MOD1 to MODn, the oscillation frequency and the output level of the carrier wave reference signal generated by the reference signal generation circuit 1a are set. Can be made smaller. As a result, the transmission loss that the carrier wave reference signal receives between the reference signal generation circuit 1a and each of the modulation circuits MOD1 to MODn can be made extremely small. In addition, a plurality of antenna elements A provided on the planar antenna
Since the transmission waves are synthesized in the air by NT1 to ANTn, the transmission output in each of the modulation circuits MOD1 to MODn can be small. Therefore, less heat is dissipated by the modulation circuit, and the heat dissipation efficiency is good because the modulation circuits are scattered on the back surface of the antenna. This eliminates the need for a high-power amplifier, which is indispensable to the transmission output stage and has poor heat dissipation efficiency.

Further, the transmission baseband control circuit 1b generates a plurality of transmission baseband signals in which the transmission baseband signals are individually phase-controlled for each modulation circuit, and these transmission baseband signals are concerned. By supplying each to the modulation circuit, it becomes possible to easily change the transmission directivity of the antenna during transmission. Next, an embodiment in which the present invention is applied to a wireless receiver will be described.

Like the antenna unit 2 of the radio transmitter, the antenna unit 3 of this embodiment also has a plurality of antenna elements ANTT1 to ANTT on the surface of a flat antenna substrate 51.
TTn are arranged in a matrix. Further, on the back surface of the antenna substrate 51, a plurality of frequency conversion circuits FCT1 to FCTn are arranged corresponding to each of the above antenna elements. These frequency conversion circuits FCT to FCTn
Are each formed by an integrated circuit (MMIC) that is made into one chip. The antenna elements and the frequency conversion circuit are connected to each other by a strip line of a minute length (not shown). Reference numeral 52 is a signal line for supplying an intermediate frequency signal from each of the frequency conversion circuits to a reception baseband signal processing unit described later.

On the other hand, FIG. 4 is a block diagram showing the circuit configuration of the radio receiving apparatus of this embodiment. In the figure, this device is composed of an antenna unit 3 and a reception baseband processing unit 4.

The antenna section 3 includes a plurality of antenna elements ANTT1 to ANTTn and frequency conversion circuits FCT1 to FCTn which form a pair with each of these antenna elements. As shown in FIG. 5, each of these frequency conversion circuits FCT1 to FCTn includes a low noise variable amplifier 21, a frequency multiplier 22, a band pass filter 23, and a mixer 24.
And a phase shifter 25. Low noise variable amplifier 21
Outputs low-noise amplified received high-frequency signals input from the corresponding antenna elements. The frequency multiplier 22 multiplies a local oscillation reference signal supplied from a reference signal generating circuit, which will be described later, by M and then amplifies the signal to output a local oscillation signal.
The band pass filter 23 removes unnecessary components of the local oscillation signal output from the frequency multiplier 22. The mixer 24
The received high frequency signal output from the low noise variable amplifier 21 is mixed with the local oscillation signal supplied from the band pass filter 23 to output a frequency converted predetermined intermediate frequency signal. The phase shifter 25 performs predetermined phase control on the intermediate frequency signal output from the mixer 24, and outputs the intermediate frequency signal.

The reception baseband processing unit 4 also includes a reference signal generation circuit 4a, a reception directivity control circuit 4b, an IF signal synthesis circuit 4c, a demodulation circuit 4d, and a reception baseband circuit 4e. The reference signal generation circuit 4a generates a predetermined local oscillation reference signal in synchronization with reception and supplies it to the frequency conversion circuits FCT1 to FCTn. The reception directivity control circuit 4b is for controlling the reception directivity of the antenna unit 3. The amplitude control signal A is supplied to the low noise variable amplifier 21 and the phase control signal is supplied to the phase shifter 25. Supply P respectively. The IF signal synthesizing circuit 4c phase-synthesizes the received intermediate frequency signals output from each of the frequency converting circuits FCT1 to FCTn. Demodulation circuit 4d
Is a two-series digital demodulation signal I obtained by QPSK demodulating the received intermediate frequency signal output from the IF signal synthesis circuit 4c.
Play (t) and Q (t). Further, the reception baseband circuit 4e subjects the demodulated signals I (t) and Q (t) to predetermined digital processing and outputs them. Next, the operation of the wireless reception device configured as above will be described.

It is now assumed that a QPSK modulated wave arrives at the above radio receiving apparatus from a transmitting earth station (not shown) via a satellite. Then, the QPSK modulated wave is converted into a received high frequency signal by the antenna elements ANTT1 to ANTTn and input to the frequency conversion circuits FCT1 to FCTn, respectively. The received high frequency signals input to the frequency conversion circuits FCT1 to FCTn are first input to the low noise variable amplification circuit 21, and the antennas are respectively received according to the amplitude control signals A1 to An supplied from the reception directivity control circuit 4b. The signal level is controlled so that the reception directivity of the signal is directed to the satellite and then input to the mixer 24.

On the other hand, in each of the above frequency conversion circuits, the local oscillation reference signal supplied from the reference signal generation circuit 4a is multiplied by the frequency multiplier 22 to become the local oscillation signal,
After being filtered by the band pass filter 23, it is input to the mixer 24. Then, in the mixer 24, the received high frequency signal output from the low noise variable amplifier circuit 21 is mixed with the local oscillation signal to be a received intermediate frequency signal (IF signal). This received intermediate frequency signal is transferred to the phase shifter
5, the phase is controlled so that the reception directivity of each antenna is directed to the satellite in accordance with the phase control signals A1 to An supplied from the reception directivity control circuit 4b.

Now, each frequency conversion circuit FCT1 to FCT
The received intermediate frequency signal output from n is input to the IF signal synthesis circuit 4c, where the phases are synthesized and output.
At this time, the noise component included in each received intermediate frequency signal is hardly phase-synthesized due to its randomness.

The synthesized reception intermediate frequency signal output from the IF signal synthesis circuit 4c is input to the demodulation circuit 4d, where Q
PSK demodulated and two series of received baseband signals I
(T) and Q (t) are played. The reproduced reception baseband signals I (t) and Q (t) are subjected to digital signal processing in the reception baseband circuit 4e to reproduce the original data, and transmitted to a terminal (not shown) or the like.

As described above, in this embodiment, the number of frequency conversion circuits FCT1 to FCTn equal to the number n of antenna elements arranged on the surface of the planar antenna are set to the antenna element ANT.
Since it is arranged on the back surface of the substrate 51 close to T1 to ANTTn, the antenna elements ANTT1 to ANTTn are provided.
The strip line connecting between the frequency conversion circuits FCT1 to FCTn is very short. Therefore, it is possible to significantly reduce the transmission loss received by the received high frequency signal on all of the above strip lines, and even if the number of antenna elements is increased to increase the size of the antenna, the received high frequency signal received by each antenna element can be efficiently used at each frequency. It is supplied to the conversion circuit. Therefore, it is possible to provide a large-scale and high-performance receiving planar antenna.

Further, since the frequency multiplier 22 for multiplying and amplifying the local oscillation reference signal is provided in each of the frequency conversion circuits, the oscillation frequency and the output level of the local oscillation reference signal generated by the reference signal generating circuit 4a are set. It can be made as small as possible. As a result, the reference signal generation circuit 4a
The transmission loss received by the local oscillation reference signal between the frequency conversion circuit and each frequency conversion circuit can be made extremely small.

Further, by the control of the reception directivity control circuit 4b, an intermediate frequency signal in which the phase and amplitude of the received high frequency signal is individually controlled for each frequency conversion circuit is generated, and these received intermediate frequency signals are generated. By performing phase combination in the IF combination circuit 4b, it becomes possible to easily change the reception directivity of the antenna during reception.

The present invention is not limited to the above embodiments. For example, in each of the above-described embodiments, only the modulation circuit or only the frequency conversion circuit is provided on the back surface of the antenna substrate so as to correspond to each antenna element. Both the circuit and the frequency conversion circuit may be provided.
By doing so, a planar antenna for both transmission and reception can be constructed. Further, in the above-described embodiment, the modulation circuit or the frequency conversion circuit is provided for each of the arrayed antenna elements, but the modulation circuit and the frequency conversion circuit are provided for each arbitrary plurality of antenna elements. It may be provided. Further, in the above embodiment, a frequency multiplier is provided in each of the modulation circuit and the frequency conversion circuit, and the carrier wave reference signal or the local oscillation reference signal generated from the reference signal generation circuit is frequency-multiplied by the frequency multiplier. However, a phase-locked oscillator that issues a carrier wave reference signal or a local oscillation reference signal may be provided in each of the modulation circuit and the frequency conversion circuit. In addition, it goes without saying that various modifications can be made to the applied communication system, modulation system, etc. without departing from the scope of the present invention.

[0043]

Since the antenna element and the radio frequency circuit can be made very close to each other, the transmission loss generated between the antenna element and the radio frequency circuit depends on the arrangement state and the number of the antenna elements. Instead, it becomes almost negligible. Therefore, it is possible to increase the size of the antenna by increasing the number of antenna elements to be arranged, and thereby to improve the performance of the antenna.

Further, since at least one of the phase and the amplitude of the transmitted / received signal can be independently controlled for each antenna element according to the arrangement position of the antenna element, the directivity of the antenna can be easily changed. As a result, it is possible to provide a wireless communication device equipped with a planar antenna that can capture a plurality of partner stations without mechanically moving the antenna body.

[Brief description of drawings]

FIG. 1 is a perspective view showing a partially cut-away appearance of an antenna unit of a wireless transmission device or a wireless reception device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a wireless transmission device according to an embodiment of the present invention.

FIG. 3 is a circuit block diagram showing a configuration of a modulation circuit shown in FIG.

FIG. 4 is a block diagram showing a circuit configuration of a wireless reception device according to an embodiment of the present invention.

5 is a circuit block diagram showing a configuration of a frequency conversion circuit shown in FIG.

FIG. 6 is a diagram showing an installation state when the planar antenna is installed in a building.

[Explanation of symbols]

1 ... Transmission baseband processing unit, 1a ... Reference signal generation circuit, 1b ... Transmission baseband control circuit, 2, 3 ... Antenna unit, 4 ... Reception baseband processing unit, 4a ... Reference signal generation circuit, 4b ... Reception directivity Control circuit, 4c ... IF signal synthesis circuit, 4d ... Demodulation circuit, 4e ... Reception baseband circuit, 11 ... Frequency multiplier, 12 ... Band pass filter, 1
3 ... 90 ° distributor, 14 ... I signal mixer, 15 ... Q signal mixer, 16 ... 0 ° combiner, 21 ... Low noise variable amplifier, 22 ... Frequency multiplier, 23 ... Bandpass filter, 2
4 ... Mixer, 25 ... Phase shifter, 31, 51 ... Antenna substrate, 32, 52 ... Feed line, ANT1 to ANTn, A
NTT1-ANTTn ... Antenna element, MOD1-MO
Dn ... Modulation circuit, FCT1 to FCTn ... Frequency conversion circuit.

Claims (6)

[Claims] 1. In a wireless communication device including a planar antenna in which a plurality of antenna elements are dispersedly arranged on a substrate, at least one of respective circuits constituting a transmission system from a transmission baseband circuit to a radio transmission high frequency circuit. A plurality of the wireless transmission high-frequency circuits are arranged on the substrate in a state of being close to the plurality of antenna elements, and the wireless transmission high-frequency circuits and the corresponding antenna elements are connected via a high-frequency line. A wireless communication device having a planar antenna. 2. At least one of a phase and an amplitude of a signal supplied to each radio transmission high-frequency circuit is variably controlled in accordance with an arrangement position of a corresponding antenna element,
The wireless communication device having a planar antenna according to claim 1, further comprising a transmission directivity control unit that varies the transmission directivity of each antenna element. 3. The transmission baseband circuit comprises carrier wave reference signal generation means for generating a reference signal of a frequency lower than that of a carrier wave and supplying the reference signal to the wireless transmission high frequency circuit, and the wireless transmission high frequency circuit is provided from the carrier wave reference signal generation means. The wireless communication device having a planar antenna according to claim 1, further comprising: a multiplication unit that frequency-multiplies the supplied reference signal to generate a carrier wave. 4. A wireless communication device having a planar antenna in which a plurality of antenna elements are dispersedly arranged on a substrate, and at least one of respective circuits constituting a receiving system from a wireless receiving high frequency circuit to a receiving baseband circuit. A plurality of the radio receiving high frequency circuits are arranged on the substrate in a state of being close to the plurality of antenna elements, and the radio receiving high frequency circuits and the corresponding antenna elements are connected through a high frequency line. A wireless communication device having a planar antenna. 5. The antenna elements are variably controlled at least one of a phase and an amplitude of a signal passing through or after passing through each radio receiving high-frequency circuit according to an arrangement position of a corresponding antenna element. The wireless communication device having the planar antenna according to claim 4, further comprising a reception directivity control unit that varies the reception directivity. 6. The reception baseband circuit generates a reference signal having a frequency lower than that of a local oscillation signal necessary for frequency-converting a reception high frequency into an intermediate frequency signal or a baseband signal, and supplies the reference signal to the radio reception high frequency circuit. 7. The local oscillation reference signal generating means is provided, and the radio receiving high frequency circuit is provided with a multiplying means for frequency-multiplying the reference signal supplied from the local oscillation reference signal generating means to generate a local oscillation signal. 4. A wireless communication device including the planar antenna according to item 4.