Microstrip dual-mode filter of nesting ring-structured parallel feeder lines

A ring structure and filter technology, which is applied in the field of filters in the field of communication technology, can solve the problem of dual-mode filters occupying a large size, and achieve good frequency selectivity.

Inactive Publication Date: 2009-08-26
SHANGHAI UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies and defects in the prior art, and propose a microstrip dual-mode filter with ...

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  • Microstrip dual-mode filter of nesting ring-structured parallel feeder lines
  • Microstrip dual-mode filter of nesting ring-structured parallel feeder lines
  • Microstrip dual-mode filter of nesting ring-structured parallel feeder lines

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Embodiment Construction

[0022] An advantageous embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention does not Limited to the following examples.

[0023] Such as figure 1 As shown, the microstrip dual-mode filter with nested ring structure parallel feeder includes: metal microstrip line 2 on the front part, metal plating on the back part, intermediate layer dielectric board 1 and input and output ports. The metal microstrip line includes a double-mode resonator 5 with an inner nested ring structure, a U-shaped coupling arm 3 and input\output feeders 4,9. The input\output feeders 4 and 9 are on the same horizontal line, and are connected to a pair of U-shaped coupling arms 3 respectively, and the gap coupling w...

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Abstract

The invention relates to a microstrip dual-mode filter of nesting ring-structured parallel feeder lines, comprising a front part metal microstrip line, a back part metal coating, an interlayer dielectric slab and an input/output port. Structure of the metal microstrip line consists of a multiplex nesting ring-structured dual-mode resonator, an input feeder line and an output feeder line of which are arranged on the same horizontal line; the input feeder line and the output feeder line are gap-coupled with an internal resonator by a pair of U-shaped coupling arms; and a perturbation which is formed by the linewidth difference Delta m between an inter loop line and an outer loop line and the small patch on a perpendicular symmetric line controls degenerate mode and adjusts two output zero positions. Compared with the traditional microstrip dual-mode filter of parallel feeder lines, the invention has the advantages of less size and better frequency selectivity, and can flexibly adjust the output performance curve zero position of the filter. The invention can be used for designing a narrowband band-pass filter of a wireless communication system and be applicable for filter miniaturization requirement of the wireless communication system.

Description

technical field [0001] The invention relates to a filter in the technical field of communication, in particular to a microstrip dual-mode filter with nested ring structure parallel feeders. Background technique [0002] In modern wireless communication systems, miniaturized and high-performance microstrip filters are widely used. The dual-mode resonator can use a single resonator structure as a double-tuned resonant circuit. For a filter with a specified order, the number of resonators is reduced by half, so the size of the filter is greatly reduced. In recent years, microstrip dual-mode filters have become one of the key passive devices in wireless communication systems due to their small size, low loss, and high quality factor, and have also become one of the research hotspots. [0003] Found through literature search to prior art, in 1972 Wolff published "Microstrip bandpass filter using degenerate modes of amicrostrip ring resonator (with the degenerate mode of microstr...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 李国辉张娟王志彬王慧娜邹锋
Owner SHANGHAI UNIV
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