JPS6133682Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a switch matrix that inputs n RF signals and outputs them to m output signal terminals in any combination, and is particularly applicable to directional couplers of microwave integrated circuits. Regarding the construction method used.

A crossbar type as shown in FIG. 1 has been proposed as a method of configuring a switch matrix that receives high frequency signals such as VHF band and microwave band as input and switches and connects the signals based on arbitrary connection relationships. (IEICE Transactions February 1976 Vol.J59-B No..
2 pp122-129 "Prototype of on-board microwave exchange device called hygiene") 8 input terminals 101-108 and input switches 111-1 that are not related to the present invention in the first country
Apart from 18, it is a 10×8 switch matrix, with inputs 101 to 108 and output 101'
Two directional couplers 201, 202 and diodes 121, 12 are installed at each cross point between ~108'.
2 is placed. Here, the diode can be considered to act as an on/off switch for the RF signal.

However, it is technically extremely difficult to realize a switch matrix having such a configuration using a microwave integrated circuit because the horizontal and vertical wiring lines intersect with each other. Furthermore, since the input and output lines are close to each other, even when the switch is off, the RF signal that leaks directly increases, making it impossible to obtain a sufficiently large on/off ratio.

The purpose of this invention is to use microwave integrated circuits (hereinafter referred to as MIC).
The purpose of the present invention is to provide a switch matrix that can be realized technically easily by using a directional coupler composed of The purpose of the present invention is to provide a switch matrix obtained by the present invention.

FIG. 2 shows an embodiment of the present invention, in which a is a top view, b is a side view, and c is a bottom view, showing the case of a 3-input, 4-output switch matrix. The three input signals IN1, IN2, and IN3 are input to three MIC directional coupler groups 1, respectively. Here, the directional coupler group 1 is composed of four directional couplers connected in series. The coupling terminal 7 of each directional coupler is connected to one terminal 8 of a MIC switch circuit (for example, 121, 122 in FIG. 1) 2. Here, three directional coupler groups and twelve switch circuits are fixed on the same plane on the surface 10 of the carrier 4.

The other terminal 9 of the switch circuit is then connected to one terminal 12 of the feedthrough 6. Here, the 12 feedthroughs 6 are embedded and fixed in the carrier 4, and are coaxial transmission lines that serve to transmit RF signals from the front surface 10 to the back surface 11 of the carrier 4.

The other terminal 13 of the feedthrough 6 is connected to a coupling terminal 14 of the second directional coupler group 3. Here, there are four groups of directional couplers 3, each consisting of three MIC-shaped directional couplers connected in series. These MIC directional couplers are fixed to carrier 5, and then connected to carrier 4.
It is fixed so that it is embedded in the carrier 4, and is arranged on the same plane parallel to the back surface 12 of the carrier 4. Outputs from the four output terminals of the second directional coupler group become output signals OUT1, OUT2, OUT3, and OUT4.

From the above, according to the present invention, the directional coupler group 1 on the input side and the directional coupler group 2 on the output side are respectively arranged in a plane and are in a front-back relationship with each other,
Moreover, the structure can be made such that the directions of the coupler groups intersect with each other at right angles, and a microwave band switch matrix suitable for planar implementation can be realized using the MIC.

In addition, since the input side circuit and the output side circuit are on separate planes, the power leaking directly from the input side circuit to the output side circuit without going through a switch is extremely small, and a sufficient on/off ratio can be obtained. be able to.

Although the switch matrix having three input terminals and four output terminals has been described above for convenience, the same configuration as described above can be used even when the number of input terminals or output terminals is arbitrary, and the same effects can be obtained. In addition, although an example of a configuration in which the directional coupler group on the input side and the switch group are on the same plane has been described, conversely, a configuration in which the directional coupler group on the output side and the switch group are on the same plane is also explained. There is a similar effect on

[Brief explanation of drawings]

FIG. 1 shows a system diagram showing the principle of a crossbar type switch matrix using directional couplers.
FIG. 2 shows an embodiment of the switch matrix according to the present invention, in which a is a top view, b is a side view, and c is a bottom view. In the figure, 1 is a first directional coupler group composed of MICs, 2 is a switch circuit composed of MICs, 3 is a second directional coupler group composed of MICs, and 4 and 5 are carriers. , 6 is the field sle.

Claims (1)

[Scope of utility model registration request] A first directional coupler group 1 (or 3) composed of microwave integrated circuits arranged linearly and connected in series, and each coupling terminal of the first directional coupler group 1 (or 3). a second directional coupler group 3 (or 1) configured of microwave integrated circuits, arranged linearly and connected in series; a feedthrough group 6 connecting the output terminal of the switch circuit group 2 and the coupling terminal of the second directional coupler group 3 (or 1); Combiner group 1 (or 3)
means that they are connected on the same plane, and that the first directional coupler group 1 (or 3) and the second directional coupler group 3 (or 1) are arranged on the back side of each other. A switch matrix using a characteristic microwave integrated circuit.