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A Differential Dual Coaxial Cavity Bandpass Filter

A band-pass filter and dual-coaxial technology, applied in the field of communication, can solve the problems of stray harmonics and harmonics that are not easy to control separately, and achieve the effect of suppressing common mode signals

Active Publication Date: 2019-05-28
NANTONG RES INST FOR ADVANCED COMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main disadvantage of the dielectric resonator is that its own spurious harmonics are relatively close and the harmonics are not easy to achieve separate control

Method used

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  • A Differential Dual Coaxial Cavity Bandpass Filter
  • A Differential Dual Coaxial Cavity Bandpass Filter
  • A Differential Dual Coaxial Cavity Bandpass Filter

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Embodiment Construction

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] The structure of a traditional coaxial cavity resonator is to place only one metal rod in a single metal cavity, which can be equivalent to a quarter-wavelength resonator. The resonant frequency of a traditional coaxial cavity resonator is mainly determined by the length of the metal rod and the size of the cavity. The fundamental mode of the traditional coaxial cavity resonator is the TEM mode, the electric field mainly diverges at the top of the metal rod, and the magnetic field mainly surrounds the bottom of the metal rod. This mode is not suitable for being excited by a differential signal with a 180 degree phase difference.

[0023] refer to figure 1 , is a schematic diagram of the structure of the differe...

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Abstract

The invention discloses a differential dual-coaxial cavity band-pass filter. The differential dual coaxial cavity band-pass filter comprises at least two dual-coaxial cavity resonator units coupled in order, wherein each dual-coaxial cavity resonator unit is provided with a metal cavity and two metal bars arranged in the metal cavity and provided with the same size; two metal bars are respectively fixed on the roof and the bottom wall of the metal cavity, each of the dual-coaxial cavity resonator units at two ends is provided with a docking port connected with two metal bars therein and used for inputting a signal or outputting the signal; compared with a dielectric filter, the differential dual-coaxial cavity band-pass filter has less harmonic component and lower production cost; and two metal bars are arranged in single metal cavity, differing from the traditional coaxial resonator, the dual-coaxial cavity resonator is more suitable for being motivated by a differential signal, and the differential band-pass filter designed based on the resonator can effectively inhibit a common-mode signal in a differential mode pass-band.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a differential double-coaxial cavity band-pass filter. Background technique [0002] Differential circuits and systems are increasingly used to implement and design radio frequency / microwave wireless systems because of their better noise suppression and anti-electromagnetic interference capabilities. As an indispensable part of the differential communication front-end transceiver system, the differential bandpass filter plays a very important role. There are many forms of technology used to design differential filters in existing design schemes, such as printed circuit board (PCB), low temperature co-fired ceramics (LTCC), substrate integrated waveguide (SIW) and so on. However, the above-mentioned several technologies have disadvantages such as low Q value and low power capacity. It is also proposed to use a dielectric resonator with a high Q value to design a differenti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/212
CPCH01P1/212
Inventor 陆清源陈建新秦伟
Owner NANTONG RES INST FOR ADVANCED COMM TECH CO LTD
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