CN2113557U

CN2113557U - High Stability Microwave Bandpass Filter

Info

Publication number: CN2113557U
Application number: CN 92213386
Authority: CN
Inventors: 刘顺康
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 1992-03-13
Filing date: 1992-03-13
Publication date: 1992-08-19

Abstract

The utility model relates to a high stable microwave strip-pass filter, which is suitable for mobile radio equipment. The utility model is composed of an input end, an output end, a cylinder metal chamber and a cylinder dielectric post resonator. Both ends of the dielectric post stretch in the axial line hole of the end cover of the metal chamber. The inner sides of the metal chamber and the end cover of the metal chamber can be provided with a dielectric barrel and a dielectric cover, and the surface of the inner sides can be plated with silver. The utility model has the advantages of small size, simple structure, easy manufacturing, low cost, good temperature stability, etc. Having no response of parasitic modes within the range of frequency doubling.

Description

High stable microwave strip-pass filter

The utility model is a kind of mini zone bandpass filter that is used for mobile communication equipment, belongs to microwave passive component.

Domestic developing rapidly needs various mini zone bandpass filters in the mobile communication equipment, require particularly that power is big, good stability, band pass filter that volume is little.Existing wire chamber microwave band-pass filter has good character of frequency response, but volume is bigger, and temperature stability can not satisfy the requirement of high-power applications occasion.

The purpose of this utility model is at the deficiencies in the prior art, and a kind of small microwave band pass filter with high stability is provided.

The utility model is made up of input, output and cylindrical metal chamber, and its characteristics are to put in the cylindrical metal chamber cylinder shape medium bar resonator, both deads in line, and the two ends of resonator are the short circuit of wire chamber end cap institute, and its resonance master mould is TM ₀₁₀Mould.The input and output of energy are coupled by probe.According to the resonance frequency and the ideograph of resonator, can design the size of dielectric rod diameter, shielded metal chamber diameter and the coupling probe of different size according to the needs of different-waveband.

The utility model compared with prior art has that volume is little, simple in structure, handling ease.Characteristics such as with low cost, no parasitic mode response in octave, and have better temperature stability than general copper chamber band pass filter.

Accompanying drawing is a structural representation of the present utility model.

The utility model can adopt scheme shown in the drawings to realize.There are wire chamber end cap (4) and (11) in the two ends in cylindrical metal chamber (1); There is medium tube (2) the wire chamber inboard, and there are dielectric cap (3) and (13) in medium tube two ends; Input and output are fixed on the wire chamber end cap (4), and input is made of input probe and input coaxial fitting, and output is made of output probe and output coaxial fitting; Tuning medium (10) and (12) are positioned at wire chamber end cap (11) one ends, and tuning medium cross section is a rectangle, can change the distance between it and the dielectric rod (7) during rotation, play the frequency tuning effect; Dielectric rod (7) is positioned at the axial location of wire chamber.In order to improve temperature stability, dielectric rod (7) two ends are stretched in the axis hole of wire chamber end cap (4) and (11), and a gap are arranged at the bottom of the hole; Medium tube, dielectric cap and dielectric rod adopt identical dielectric material, for example adopt high-k (ε _r=35～40) ceramic material; Medium tube, dielectric cap inner surface are silver coated.Distance between the length of probe and it and the dielectric rod can be taked the experimental and adjustment methods decision.Yan Zhi S-band band pass filter for example, its centre frequency is 2.58GHZ, and in-band insertion loss is 0.8dB, and three dB bandwidth is 25MHZ, no parasitic mode in the octave band.

Claims

1. A high-stability microwave bandpass filter for mobile communication equipment, consisting of an input end, an output end and a cylindrical metal cavity, characterized in that a cylindrical dielectric rod resonator is placed in the cylindrical metal cavity, and the two The axes are coincident, and both ends of the resonator are short-circuited by the end caps of the metal cavity.

2. The high-stable microwave bandpass filter according to claim 1, characterized in that both ends of the dielectric rod (7) extend into the axial holes of the metal cavity end covers (4) and (11), and there is a gap with the bottom of the hole .

3. The high stability microwave bandpass filter according to claim 1 or 2, characterized in that there is a dielectric cylinder (2) inside the metal cavity, and dielectric covers (3) and (13) are located at both ends of the dielectric cylinder.

4. The high stability microwave bandpass filter according to claim 3, characterized in that the inner surfaces of the dielectric cylinder and the dielectric cover are plated with a silver layer (14).

5. The high stability microwave bandpass filter according to claim 4, characterized in that the dielectric cylinder, dielectric cover and dielectric rod are made of the same dielectric material.