Bidirectional coupling circuit based on orthogonal field

Abstract

The invention discloses a bidirectional coupling circuit based on an orthogonal field. The circuit comprises a main transmission line, a coupling transmission line, a coupling matching part, a matching resistor, and a gold strip, wherein the main transmission line and the coupling transmission line are arranged at an angle of 90 degrees, and the tail end of the coupling transmission line is connected with the gold strip through the coupling matching part. The gold strip crosses the main transmission line and is connected with the grounding bonding pad on the dielectric substrate through the coupling matching part and the matching resistor; symmetric coupling circuits from the port 1 to the port 3 and from the port 2 to the port 3 are formed. Compared with the prior art, the circuit designstructure for realizing transceiving bidirectional coupling through an orthogonal field has the advantages that effective coupling of bidirectional transmission signals cannot be realized by an existing coupling circuit, the coupling circuit does not occupy extra circuit size, and a good scheme for realizing circuit miniaturization integration and solving bidirectional coupling detection of a transceiving system is realized.

Description

technical field [0001] The invention belongs to the field of radio frequency microwave circuit design, in particular to coupling circuit design. Background technique [0002] In the design of RF microwave circuits, coupling circuits are very common. Usually, coupling circuits are used to extract signal parameters for self-test / self-calibration of microwave channels. [0003] The traditional coupling circuit is the broadside coupling mode of the microstrip line (such as figure 1 As shown), this coupling circuit is easy to achieve broadband coupling characteristics, but it can only achieve coupling extraction in one signal direction, that is, the coupling is directional. The signal transmission direction is: Port1-Port2, and the coupling direction is: Port1-Port3. Another disadvantage is that the circuit size is large, such as figure 1 The length dimension L is related to the working frequency, especially in the case of two-way coupling applications, it is necessary to use ...

AI Technical Summary

Problems solved by technology

Another disadvantage is that the circuit size is large, such as figure 1 The length dimension L is related to the working frequency, especially in the case of two-way coupling applications, it is necessary to use two couplers to switch between active devices.

[0004] Traditional coupling circuits cannot meet the application requirements of miniaturized integration and bidirectional coupling, especially in the case of transceiver system applications, so there is an urgent need for new structural forms and methods to realize miniaturized bidirectional coupling circuits

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