CN206225538U - A kind of wideband dual polarized plane antenna for base station of differential feed - Google Patents

Abstract

The utility model discloses a differential feed broadband dual-polarization planar base station antenna, which comprises an antenna radiation unit, a reflection plate and a four-port feed network, the antenna radiation unit is fixed above the reflection plate through a support column, and the antenna The radiation unit is a planar structure, including a dielectric substrate, a first polarizer, a second polarizer and a coupling unit. The first polarizer is etched on the lower surface of the dielectric substrate, and the second polarizer is etched on the dielectric substrate. On the upper surface of the substrate, the coupling unit is etched on the upper surface and the lower surface of the dielectric substrate, and the four-port feeding network is located at the center of the dielectric substrate. The antenna has the advantages of large bandwidth, high isolation, high gain, stable radiation pattern, simple and compact structure, etc. It is suitable for mobile communication base station antennas and is easy to integrate with differential circuits.

Description

A Differential Feed Broadband Dual Polarized Planar Base Station Antenna

technical field

The utility model relates to the field of mobile communication base station antennas, in particular to a differential feed broadband dual-polarization planar base station antenna.

Background technique

The rapid development of the mobile communication system has made the competition in the mobile communication market more intense, making the communication channel crowded, and the requirements for the communication system have been continuously improved. The base station antenna is an important part of the mobile communication system, and its performance plays an important and even decisive role in the communication system. Today, the development trend of base station antennas is no longer a single antenna that works independently, but more and more integrated with other communication units to jointly complete signal processing and propagation.

Because the balanced circuit can greatly reduce crosstalk, the RF front-end usually uses a differential circuit to transmit signals, and in the existing antenna technology, most antennas are designed to be fed by a single port. The connection between the single-port antenna and the RF front-end differential system usually uses a balun to convert the differential signal into a single-ended signal and feed it into the single-port antenna. However, the use of the balun will cause RF front-end loss, lower system efficiency, and lower integration. The differential antenna changes the traditional single-port feed, adopts dual-feed ports, directly inputs differential signals to the two feed ports, avoids the use of baluns, reduces the signal loss at the input port, and improves the efficiency of the antenna. Moreover, the use of differential base station antennas can enable a higher integration level of the radio frequency front end, so differential base station antennas are of great significance to mobile communication systems.

Utility model content

In order to overcome the shortcomings and deficiencies of the prior art, the utility model provides a differential feed broadband dual-polarized planar base station antenna.

This antenna is a differentially fed dual-polarized planar antenna with large impedance bandwidth, high isolation, high gain, and stable pattern.

The utility model adopts the following technical solutions:

A differential feed broadband dual-polarized planar base station antenna, comprising an antenna radiating unit, a reflector and a four-port feed network, the antenna radiating unit is fixed above the reflector through a support column, and the antenna radiating unit is a planar structure , including a dielectric substrate, a first polarizer, a second polarizer and a coupling unit, the first polarizer is etched on the lower surface of the dielectric substrate, and the second polarizer is etched on the upper surface of the dielectric substrate, The coupling unit is etched on the upper surface and the lower surface of the dielectric substrate, and the four-port feeding network is located at the center of the dielectric substrate.

The first polarizer includes two pairs of first half-wave polarizers and a first coplanar microstrip line, and the two pairs of first half-wave polarizers are connected by a first coplanar microstrip line. The first half-wave polarizer is symmetrical about the center of the dielectric substrate;

The second polarizer includes two pairs of second half-wave polarizers and a second coplanar microstrip line, and the two pairs of second half-wave polarizers are connected by a second coplanar microstrip line. The second half-wave polarizer is symmetrical about the center of the dielectric substrate;

The first and second coplanar microstrip lines are perpendicular to the center of the dielectric substrate, and the angle between adjacent first and second half-wave polarizers is 90 degrees.

The structural dimensions of the first polarizer and the second polarizer are the same, and the size of the first polarizer and the second polarizer is 0.42λ ₀ , where λ ₀ is the wavelength of the central resonant frequency of the antenna in free space .

The coupling unit includes eight coupling arcs, four of which are printed on the upper and lower surfaces, and the four coupling arcs are located at the four corners of the dielectric substrate, specifically at the periphery of the angle between the first and second half-wave polarizers.

The four-port network includes a first differential feed network for feeding the first polarizer and a second differential feed network for feeding the second polarizer, the first differential feed network It includes two first differential feed ports and a first feed stub, the first feed stub is etched on the upper surface of the dielectric substrate, and the second differential feed network includes two second differential feed An electrical port and a second feeding stub, the second feeding stub is etched on the lower surface of the dielectric substrate, and the first and second feeding stubs are perpendicular to each other.

The first and second differential feed ports are both coaxial lines, the two first differential feed ports are located at both ends of the first feed stub, and the inner conductors are connected to the first feed stub, Its outer conductor is connected to the first coplanar microstrip line;

The two second differential feed ports are located at both ends of the second feed stub, the inner conductors of which are connected to the second feed stub, and the outer conductors are connected to the second coplanar microstrip line.

Both the reflection plate and the dielectric substrate are square.

The support column is made of insulating material.

The structural dimensions of the first feeding stub and the second feeding stub are the same.

The beneficial effects of the utility model:

(1) The antenna uses two pairs of polarized oscillators to be printed orthogonally on both sides of the dielectric substrate, and the antenna structure is simple;

(2) The utility model adopts a four-port feed network, wherein the feed network only uses two feed stubs and four ports, and the feed network is simple.

(3) The feed network of the antenna is directly connected to the coplanar microstrip line of the polarized oscillator to realize differential feed, and the structure is simple and novel.

(4) The antenna bandwidth can cover 1710-2690MHz, the polarization isolation can reach 60dB, and the pattern is stable.

Description of drawings

Fig. 1 is the three-dimensional structural diagram of the differential feed broadband dual-polarization planar base station antenna of the utility model;

Fig. 2 is the top view of the differentially fed broadband dual-polarized planar base station antenna of the present invention;

Fig. 3 is the enlarged view of the four-port feed network of the differential feed broadband dual-polarization planar base station antenna of the present utility model;

Fig. 4 is the sectional view of the differential feed broadband dual-polarization planar base station antenna of the present utility model;

Fig. 5 is the impedance bandwidth of the differential feed broadband dual-polarization planar base station antenna of the present utility model;

Fig. 6 is the gain of the differentially fed broadband dual-polarized planar base station antenna of the present utility model;

Fig. 7 is a horizontal plane direction diagram of the differentially fed broadband dual-polarized planar base station antenna of the present invention.

detailed description

The utility model will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example

As shown in Figures 1 and 4, a differentially fed broadband dual-polarized planar base station antenna includes an antenna radiation unit 1, a reflector 2 and a four-port feed network 4, and the antenna radiation unit 1 passes through four support columns 3 is fixed above the reflecting plate 2 with a distance of 40mm.

As shown in Figure 2, the antenna radiation unit 1 is a planar structure, including a dielectric substrate 5, a first polarizer 7, a second polarizer 10 and a coupling unit 6, and the first polarizer 7 is specifically +45 degrees The polarizer, the second polarizer is a -45 degree polarizer, the first polarizer 7 is etched on the lower surface of the dielectric substrate 5, and the second polarizer 10 is etched on the upper surface of the dielectric substrate 5 , the coupling unit 6 is etched on the upper surface and the lower surface of the dielectric substrate 5 , and the four-port feed network 4 is located at the center of the dielectric substrate 5 .

The first polarizer 7 is composed of two pairs of the first half-wave polarizer 8A and the first coplanar microstrip line 9A, the first half-wave polarizer 8A is a +45 degree half-wave oscillator, and the two pairs The first half-wave polarizer 8A is connected by a first coplanar microstrip line 9A, the two pairs of first half-wave polarizers 8A are symmetrical about the center of the dielectric substrate 5, and the two pairs of first half-wave polarizers 8A and the second A coplanar microstrip line 9A is etched on the lower surface of the dielectric substrate 5 .

The second polarizer 10 includes two pairs of second half-wave polarizers 8B and a second coplanar microstrip line 9B, and the two pairs of second half-wave polarizers 8B pass through the second coplanar microstrip line 9B connection, the second half-wave polarizer 8B is specifically a -45-degree half-wave oscillator, and the two pairs of second half-wave polarizers 8B and the second coplanar microstrip line 9B are etched on the upper surface of the dielectric substrate 5 .

The two pairs of second half-wave polarizers 8B are symmetrical about the center of the dielectric substrate 5;

The first and second coplanar microstrip lines 9A, 9B are perpendicular to the center of the dielectric substrate 5, and the angle between the adjacent first and second half-wave polarizers 8A, 8B is 90 degrees.

The structural dimensions of the first polarizer 7 and the second polarizer 10 are the same, and the dimensions of the first polarizer 7 and the second polarizer 10 are 0.42λ ₀ , where λ ₀ is the central resonant frequency of the antenna at a free The wavelength in space, the dimension in this embodiment is specifically the length dimension.

The coupling unit 6 is etched on the upper and lower surfaces of the dielectric substrate, and four coupling arcs are printed on each side. The four coupling arcs are located at the four corners of the dielectric substrate 5, specifically at the first and second half-wave poles. The periphery of the included angle of vibrator 8A, 8B.

As shown in Figure 3, the four-port feed network 4, the first differential feed network includes the first differential feed ports 12A, 12B and the first feed stub 11A, the first differential feed network is the first Polarized oscillator feed. The second differential feed network includes second differential feed ports 13A, 13B and a second feed stub 11B, and the second differential feed network feeds the second polarizer. The first feeding stub 11A is etched on the upper surface of the dielectric substrate 5 , and the second feeding stub 11B is etched on the lower surface of the dielectric substrate 5 .

As shown in Figure 3, the two feed ports of the first differential feed network are implemented by two coaxial cables, after the upper end of the coaxial cable passes through the reflector 2, the outer conductors at the upper end are respectively connected to the first coplanar micro The strip line 9A is connected, and the inner conductors respectively pass through the dielectric substrate 5 and are connected to the first feeding stub 11A; the two feeding ports of the second differential feeding network are also realized by two coaxial cables, and the coaxial cables After the upper end passes through the reflection plate 2, the outer conductors at the upper end pass through the dielectric substrate 5 and are respectively connected to the second coplanar microstrip lines 9B, and the inner conductors are respectively passed through the dielectric substrate 5 to be connected to the second feeding stub 11B.

The structural dimensions of the first feeding stub and the second feeding stub are the same, and the characteristic impedance of the first and second feeding stubs is 50 ohms.

Both the reflector and the dielectric substrate are square, and the dielectric substrate 5 is Ro4350B with a thickness of 0.76mm.

As shown in Figure 5, the bandwidth of the differential feed broadband dual-polarized planar base station antenna obtained in this embodiment has a return loss of -15dB within 1.69-2.73GHz, which can cover the 1710- 2690MHz, and the polarization isolation is over 60dB.

As shown in FIG. 6 , it is the gains of two polarizations of the differentially fed broadband dual-polarization planar base station antenna obtained in this embodiment, and the gains of the two polarizations reach about 9 dBi within 1.7-2.7 GHz.

As shown in FIG. 7 , it is the horizontal plane pattern at 2.2 GHz of the broadband dual-polarized differentially fed planar antenna obtained in this embodiment. From this figure, it can be concluded that the utility model differential feed broadband dual-polarized planar base station antenna has a stable pattern.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the described embodiment, and any other changes, modifications, modifications, Substitution, combination, and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (9)

1. the wideband dual polarized plane antenna for base station of a kind of differential feed, it is characterised in that including antenna radiation unit, reflecting plate and Four port feeding networks, the antenna radiation unit is fixed on the top of reflecting plate, the antenna radiation unit by support column It is planar structure, including medium substrate, the first polarization oscillator, the second polarization oscillator and coupling unit, the first polarization oscillator The lower surface of medium substrate is etched in, the second polarization oscillator is etched in the upper surface of medium substrate, the coupling unit erosion The upper and lower surface of medium substrate is engraved on, four port feeding network is located at the center of medium substrate.

2. the wideband dual polarized plane antenna for base station of a kind of differential feed according to claim 1, it is characterised in that described One polarization oscillator includes two pairs the first half wave polarization oscillators and the first coplanar microstrip lines, and described two pairs the first half wave polarization oscillators lead to Cross the first coplanar microstrip line connection, described two pairs the first half wave polarization oscillators are on medium substrate Central Symmetry；

The second polarization oscillator includes two pairs the second half wave polarization oscillator and the second coplanar microstrip lines, two pairs of second half-waves Polarization oscillator is connected by the second coplanar microstrip line, and described two pairs the second half wave polarization oscillators are on medium substrate Central Symmetry；

Described first and second coplanar microstrip line is mutually orthogonal in medium substrate center, and first and second adjacent half wave polarization shakes The angle of son is 90 degree.

3. the wideband dual polarized plane antenna for base station of a kind of differential feed according to claim 2, it is characterised in that described One polarization oscillator and the second polarization oscillator structure size all same, the first polarization oscillator and the second polarization oscillator size are 0.42 λ₀,λ₀It is the center resonant frequency wavelength in free space of the antenna.

4. a kind of wideband dual polarized plane antenna for base station of differential feed according to claim 1, it is characterised in that the coupling Closing unit includes eight coupling circular arcs, and upper and lower surface respectively prints four, and four coupling circular arcs are located at four angles of medium substrate, tool Body is located at the periphery of first and second half wave polarization oscillator angle.

5. the wideband dual polarized plane antenna for base station of a kind of differential feed according to claim 1, it is characterised in that described four Port network is included for the first differential feed network to the first polarization oscillator feed and for the second polarization oscillator feed The second differential feed network, the first differential feed network include two the first differential feed ports and first feed cutting back Line, the first feed stub is etched in the upper surface of medium substrate, and the second differential feed network includes two second Differential feed port and the second feed stub, the second feed stub are etched in the lower surface of medium substrate, and described the One and second feed stub be mutually perpendicular to.

6. the wideband dual polarized plane antenna for base station of a kind of differential feed according to claim 5, it is characterised in that described First, the second differential feed port is coaxial line, and two the first differential feed ports are located at the two ends of the first feed stub, its Inner wire is connected with the first feed stub, and its outer conductor is connected with the first coplanar microstrip line；

Two the second differential feed ports are located at the two ends of the second feed stub, and its inner wire and the second feed stub connect Connect, its outer conductor is connected with the second coplanar microstrip line.

7. the wideband dual polarized plane antenna for base station of a kind of differential feed according to claim 1, it is characterised in that described anti- Penetrate plate and medium substrate be it is square.

8. a kind of wideband dual polarized plane antenna for base station of differential feed according to claim 1, it is characterised in that the branch Dagger is made up of insulating materials.

9. the wideband dual polarized plane antenna for base station of a kind of differential feed according to claim 5, it is characterised in that described The physical dimension of one feed stub and the second feed stub is identical.