Double-frequency filter

A filter and resonance technology, applied in waveguide devices, electrical components, circuits, etc., can solve the problem of large overall footprint, high insertion loss in the passband, and difficulty in meeting low cost, small size, light weight and high performance etc. to achieve the effects of compact structure, high out-of-band rejection, and filtering out unwanted signals and noise signals

Active Publication Date: 2018-09-04
SHENZHEN WEIYINGZHI TECH CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

The center frequencies of the two passbands of the filter can be adjusted by changing the length of the stub lines in the square ring, but the insertion loss in the passband is high, and the overall occupied area is l

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Embodiment Construction

[0036] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0037]The design methods of the traditional dual-band filter include: (1) by introducing a transmission zero in the single-passband filter, the single-passband is divided into double-passbands, the filter structure is complex, and the design is difficult; (2) using a ladder Impedance dual-mode characteristic design dual-passband filter, each passband of the filter is difficult to control independently; (3) The dual-passband filter is realize...

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Abstract

The invention discloses a double-frequency filter, and the filter is set to be a multilayer circuit. The filter comprises first resonant units disposed on the third layer and the fourth layer of the multilayer circuit; second resonant units disposed on the second layer and the third layer of the multilayer circuit; and third resonant units disposed on the third layer and the fourth layer of the multilayer circuit, wherein the first resonant units and the third resonant units have the same topological structure and are arranged in left-right mirror symmetry, and the second resonant units are cascaded between the first resonant units and the third resonant units. The filter is small in size, is small in insertion loss, has the independently adjustable working band, and can achieve the extraction of signals at multiple bands and the inhibition of interference.

Description

technical field [0001] The invention relates to the technical field of microwave communication, in particular to a dual-frequency filter. Background technique [0002] Filters are frequency-selective to signals, and can pass or block, separate or synthesize signals of certain frequencies in a communication system. Since the electromagnetic spectrum resources are becoming more and more limited and must be allocated according to the application, the filter used for separating / combining signals becomes more and more important, and its performance characteristics directly affect the overall system index. Dual-band filters can work in two different frequency bands at the same time, and are often used in front-end microwave radio frequency modules and multi-channel communication systems. [0003] In recent years, the emergence of new materials and process technologies such as micro-electromechanical systems (MEMS) technology, high-temperature superconducting technology, low-tempe...

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Application Information

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IPC IPC(8): H01P1/203
CPCH01P1/20345
Inventor 钱可伟王洪洋
Owner SHENZHEN WEIYINGZHI TECH CO LTD
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