High-isolation duplexer with coupled electromagnetic shunt

Abstract

The invention discloses a high-isolation duplexer based on a coupled electromagnetic shunt. The high-isolation duplexer mainly solves the problem that an existing duplexer is large in volume and complex in structure and design. The high-isolation duplexer comprises a medium substrate and three ports, wherein a metal conduction band structure (2) is arranged on the front surface of the medium substrate, and an earth plate (3) is arranged on the back surface of the medium substrate; the ports are respectively connected with the metal conduction band structure; the metal conduction band structure is divided into a left part and a right part which are in the same shape and have different sizes, and two wave filters with different frequencies in the symmetrical structure are formed; each wave filter consists of an isosceles right-angled triangle micro-strip ring (7) with an open top, a curved micro-strip line section (8) and a broken line micro-strip line section (9) surrounding the lower part of a triangle; a magnetic coupling through hole (10) is formed in the middle position of the bottom edge of the triangle, an electric coupling opening (11) is formed in the middle of the broken line micro-strip line section (9), and two transmission zeros of each wave filter are respectively controlled by electric coupling and magnetic coupling. The high-isolation duplexer disclosed by the invention is high in isolation and simple in structure, and can be used for a small-scale radio frequency communication system.

Description

technical field

[0001] The invention belongs to the technical field of microwave devices, in particular to a novel miniaturized duplexer with a channel isolation amplitude above 40 dB, which can be used in miniaturized radio frequency communication systems. Background technique

[0002] In a wireless communication system, a radio frequency transceiver and an antenna are connected together to complete the processing tasks of receiving and sending signals. If one antenna is configured for the receiver and the transmitter, it will not only increase the size and cost of the circuit, but also cause mutual interference between the two antennas, which will reduce the stability and reliability of the system. A duplexer allows transceivers to share an antenna without interfering with each other.

[0003] Duplexers include transceiver switches and frequency band duplexers. If the transceivers use the same frequency band, the duplexer is equivalent to a transceiver switch. When the ...

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