Ultra-wideband annular coupler

Abstract

The invention discloses an ultra-wideband annular coupler. The coupler comprises a PCB; four transmission lines are arranged on the front surface of the PCB; each transmission line comprises a first quarter-wavelength transmission line, an n-shaped second transmission line and a third quarter-wavelength transmission line which are connected in sequence; ports of the first quarter-wavelength transmission lines are arranged at the edge of the PCB; ports of the four third quarter-wavelength transmission lines are sequentially connected through three connecting microstrip lines; and ports of the two third quarter-wavelength transmission lines at the head and the tail are connected with coplanar coupling strip lines with one ends grounded in a short-circuit mode. According to the annular coupler, a three-fourths wavelength transmission line of a traditional annular coupler is replaced by a mode that quarter-wavelength transmission lines with one short-circuited ends are coupled with one another, so that the size of a circuit is reduced, and the working bandwidth of the circuit is expanded; and meanwhile, the broadband characteristic of the circuit is realized by using the matching network, and the requirement of a future communication system on the broadband of the device is met.

Description

technical field [0001] The present application relates to the field of ring couplers, in particular to an ultra-wideband ring coupler. Background technique [0002] With the continuous development of modern communication technology, people's demand for ultra-wideband microwave devices in communication systems is also increasing. As an important microwave passive device, people's research on broadband ring couplers is also increasing. Broad and deep. [0003] In the prior art, the ring couplers commonly used in communication systems are often narrow-band. When a wide-band ring coupler is needed, the traditional method is to cascade a single narrow-band ring coupler to achieve broadband characteristics, or The broadband characteristics of the circuit are realized by cascading multiple quarter-wavelength impedance matching transformation sections at the four ports of the ring coupler, but the circuit structure is relatively complicated and the manufacturing cost is high. Con...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the ring couplers commonly used in communication systems are often narrow-band. When a wide-band ring coupler is needed, the traditional method is to cascade a single narrow-band ring coupler to achieve broadband characteristics, or The broadband characteristics of the circuit are realized by cascading multiple quarter-wavelength impedance matching transformation sections at the four ports of the ring coupler, but the circuit structure is relatively complicated and the manufacturing cost is high.

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