Mixed radio-frequency duplexer based on discrete device

Abstract

The invention discloses a mixed radio-frequency duplexer based on a discrete device, which comprises a hybrid ring and three power dividers, wherein the hybrid ring and the power dividers are formed by discrete inductors, capacitors and resistors; the hybrid ring and the isotonic terminals of the three power dividers are successively connected in series to form a ring; the difference terminal of the hybrid ring is the transmitting terminal of the duplexer; the sum terminal of one power divider adjacent to the hybrid ring is the antennal terminal of the duplexer; the sum terminal of another power divider adjacent to the hybrid ring is connected with an earthing resistor; and the sum terminal of another power divider opposite to the hybrid ring is the receiving terminal of the duplexer. The mixed radio-frequency duplexer based on the discrete device can be used for single-antenna communication systems, radar systems and the like. Especially for a radio-frequency frequency band, the isolation degrees of the transmitting terminal and the receiving terminal can be effectively improved, the production cost of the device is lowered, the area of the duplexer is reduced, and the mixed radio-frequency duplexer is favorable for improving the integration level of the communication circuit, and has an important meaning for the miniaturized development of the communication system.

Description

technical field [0001] The invention relates to a duplexer in a radio frequency band wireless communication system, in particular to a radio frequency hybrid duplexer with high transceiver isolation and based on discrete devices, which belongs to the technical field of wireless communication. Background technique [0002] In systems such as communication and radar, a single-antenna solution is often used to reduce the size of the system. The single-antenna solution requires a circulator for transceiver isolation. The Chinese patent No. 200620069716.8, entitled "Mini Microstrip Circulator and Isolator", discloses a ferrite circulator / isolator, and describes its structure in detail. However, commonly used ferrite circulators have high cost and low isolation, and the transmission power leaks to the receiving end, which easily saturates the low-noise amplifier at the receiving end, which limits its application in communication systems. [0003] In low-cost transceiver systems,...

AI Technical Summary

Problems solved by technology

However, in the radio frequency band of wireless communication, the area of ​​the microstrip passive circuit is large (on the order of centimeters), and this kind of microstrip line hybrid circulator with a large area limits the miniaturization and integration of the radio frequency band communication circuit degree of improvement

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