A kind of Taiji type resonator, adjusting method of filter and filter

Abstract

The invention discloses a Taiji type resonator, a filter and an adjustment method thereof, wherein the Taiji type resonator includes a substrate, a resonator circuit pattern formed on the substrate, and the shape of the resonator circuit pattern is a yin-yang fish A Yang or Yin fish shape in a Tai Chi pattern, where the circuit is grounded at the eye of the head of the patterned Yang or Yin fish, and the tail of the Yang or Yin fish is connected to the feeder. The filter of the present invention adopts a resonator structure with gradually changing λg / 4 of cathode and anode, and is grounded at the end. The structure has the characteristics of gradually stepped impedance (SIR), and at the same time, the ground hole is introduced to make the resonant size of the resonator approximately λg / 4, further reducing the size of the filter. In addition, the filter structure design is relatively simple.

Description

technical field [0001] The invention belongs to the technical field of microwave and millimeter wave passive devices, and in particular relates to a Taiji type resonator, a filter and an adjustment method thereof. Background technique [0002] RF microwave filters are important components of communication systems, radar systems, and measurement systems, and their performance is related to the performance of the system. Therefore, RF microwave filters have always been the focus and hotspot of research in the field of wireless communication. With the development of modern wireless communication technology, the system has higher and higher requirements for electromagnetic compatibility and anti-interference. [0003] The traditional microwave filter design is mostly directly based on the design index requirements, using the low-pass prototype to derive and design the reactance and resistance values ​​of the required filter, and then deduce the characteristic impedance value of...

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Problems solved by technology

This method is more accurate in design, but the design process is more cumbersome and the design cycle is longer. In the prior art, the coupling coefficient matrix has been used to design a bandpass filter. This method is simple and fast and the design cycle is shorter, but the filter uses λ g / 2 parallel coupled line structure, larger filter structure

At the same time, there is also a further use of λ g The interdigital coupling structure of / 4 greatly reduces the volume of the filter, but due to the uniform parallel short-circuit structure, the volume of the filter is still too large, which cannot well meet the design requirements

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