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Balanced filter branch line coupler

A coupler and branch line technology, applied in the field of radio frequency communication, can solve problems such as complex structure, high cost, and frequency selectivity to be improved, and achieve the effects of simplified structure, high frequency selectivity, and reduced processing costs

Inactive Publication Date: 2016-10-12
NANTONG UNIVERSITY
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Problems solved by technology

[0004] The present invention aims at the technical problems existing in the prior art that the balanced filter branch line coupler has a double-layer design, complex structure, high cost, and frequency selectivity needs to be improved, and provides a balanced filter branch line with a single-layer structure The coupler realizes the power distribution, filter processing and common-mode signal suppression of the differential signal while simplifying the structure of the coupler, reducing the processing cost and obtaining higher frequency selectivity.

Method used

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Embodiment 1

[0036] Please refer to figure 1 , an embodiment of the present invention provides a balanced filter branch line coupler, including:

[0037] The first single port 1, the second single port 2, the third single port 3, the fourth single port 4, the fifth single port 5, the sixth single port 6, the seventh single port 7 and the eighth single port arranged at intervals in sequence 8; wherein, the impedance of any one of the first to eighth single ports (1 to 8) is 50 ohms;

[0038] The first single port 1 is connected to the second single port 2 through the first transmission line 10, the third single port 3 is connected to the fourth single port 4 through the second transmission line 20, and the fifth single port 5 and the sixth single port 6 are connected through the third single port 6. The transmission line 30 is connected, and the seventh single port 7 and the eighth single port 8 are connected through the fourth transmission line 40; wherein, the first to the fourth transmi...

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Abstract

The invention discloses a balanced filter branch line coupler, and aims at solving the technical problems that the balanced filter branch line coupler in the prior art is of a dual-layer design and is complicated in structure and high in cost, and the frequency selectivity needs to be improved. The coupler comprises eight single ports (1-8), four half-wave coupled transmission lines (10, 20, 30 and 40) for connecting the single ports, and four quarter-wave uncoupled transmission lines (50, 60, 70 and 80) for connecting differential ports, wherein the single ports (1 and 2) form the differential port (A); the single ports (3 and 4) form the differential port (B); the single ports (5 and 6) form the differential port (C); and the single ports (7 and 8) form the differential port (D). The structure of the coupler is simplified and the processing cost is reduced when power distribution, filter processing and common-mode signal suppression on differential signals are achieved; and the technical effect of higher frequency selectivity can be obtained.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a balanced filter branch line coupler. Background technique [0002] Nowadays, with the rapid development of radio frequency communication systems, balanced circuits are widely used due to their strong anti-electromagnetic interference capability, good common-mode rejection, and easy connection with other balanced circuits. As an important type of device in the microwave system, the branch line coupler can realize the power and phase distribution of the microwave signal, and plays an important role in the microwave components, the feed network and the whole machine that realize various functions. Therefore, the balanced branch line coupler design is very important. [0003] In addition, fusion design has more advantages in multifunctional integration, because fusion design can realize multifunctional integration of devices, and further promote miniaturizati...

Claims

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Application Information

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IPC IPC(8): H01P5/12
CPCH01P5/12
Inventor 施金强俊曹青华张威秦伟陈建新包志华
Owner NANTONG UNIVERSITY
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