Common port coupling device and microwave cavity device

Abstract

The invention provides a common port coupling device, which comprises a cavity, a cover plate, signal ports and a common port, wherein the signal ports are arranged on one end of the cavity and used for being connected with resonant circuits in the cavity, and the common port is arranged at the other end of the cavity; the resonant circuits comprise a high-frequency circuit and a low-frequency circuit, each resonant circuit is at least composed of one resonant column, the high-frequency resonant column close to the common port is the first high-frequency resonant column, and the low-frequency resonant column close to the common port is the first low-frequency resonant column; a coupling hole is formed in one side, facing the common port, of the first low-frequency resonant column, and a coupling rod which is connected with the first low-frequency resonant column in a capacitive coupling manner is inserted in the coupling hole; and the first high-frequency resonant column is connected with a coupling piece, and the coupling piece is parallel to and coupled with the coupling rod. The common port coupling device is applicable to arbitrary one of microwave cavity devices such as a combiner, a duplexer, a filter and a feed, can meet the bandwidth requirements of the high and low frequency resonant circuits with broad bandwidths, is simple in structure and requires no welding, significantly reduces the impact of nonlinear factors on the stability of the ports, and is suitable for mass production.

Description

technical field [0001] The invention relates to the field of mobile communication devices, in particular, the invention relates to a common port coupling device and a microwave cavity device adopting the structure of the device. Background technique [0002] With the development of modern mobile communication, microwave devices composed of microwave filters have become an indispensable part of mobile communication technology, and in order to meet the application requirements, the market has higher and higher requirements for microwave devices. While the port bandwidth is sufficiently wide, strict intermodulation index requirements must also be met. Among them, the microwave cavity combiner is composed of multiple filter channels. When the cavity combiner includes high-frequency and low-frequency channels, the design of its common port is particularly complicated. [0003] In the prior art, there is a port coupling structure design with a very wide port bandwidth, such as th...

AI Technical Summary

Problems solved by technology

Among them, the microwave cavity combiner is composed of multiple filter channels. When the cavity combiner includes high-frequency and low-frequency channels, the design of its common port is particularly complicated.

[0003] In the prior art, there is a port coupling structure design with very wide port bandwidth, such as the cavity device and its resonant channel connection port coupling structure disclosed in CN102306860A , the design is a rod-insert coupling structure that can achieve a wide coupling bandwidth, but its limitation is that it can only be applied to the case of an average high-frequency path or a low-frequency path, and cannot meet the application requirements that include both high-frequency and low-frequency paths

[0004] The utility model patent with the publication number CN203326071U discloses an ultra-wideband dual-frequency combiner, which passes through a ladder network with series branches and parallel branches The dual-band filter circuit composed of the above-mentioned form realizes a wide bandwidth design and can include high-frequency and low-frequency channels at the same time. The influence of non-linear factors is large

Images