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Double frequency band filter of SIR coaxial cavity

A dual-band filter, coaxial cavity technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve the problems of size reduction, complex design process, large duplexer volume, etc., and achieve reduced size and high selectivity. , Improve the effect of harmonic suppression ability

Inactive Publication Date: 2013-06-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a SIR coaxial cavity double-pass band filter, which adopts the step impedance coaxial cavity resonance As the basic resonant unit, the SIR (SIR) introduces cross-coupling between the cavities to generate two transmission zeros, which greatly improves the out-of-band suppression ability. After simulation and actual measurement analysis, compared with the traditional duplexer, the dual-band filter of the present invention Significantly reduced in size, and the dual frequency selectivity of the filter is very good

Method used

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  • Double frequency band filter of SIR coaxial cavity
  • Double frequency band filter of SIR coaxial cavity
  • Double frequency band filter of SIR coaxial cavity

Examples

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Embodiment 1

[0051] see Figure 1 to Figure 12 , the SIR coaxial cavity dual-band filter is composed of a passband resonator and a stopband resonator. There are electrical coupling and magnetic coupling between the passband resonators, and only magnetic coupling between the stopband resonator and the passband resonator. The entire filter The device uses the SIR coaxial cavity resonator as the basic unit. The SIR coaxial cavity resonator consists of three parts: a rod-shaped inner metal transmission line 7, an intermediate dielectric layer 4, and an outer cylindrical metal wall 1 coaxial with the inner metal transmission line. The intermediate dielectric layer 4 is located on the outer cylindrical metal In the resonant cavity between the wall 1 and the inner metal transmission line 7, the upper and lower ends of the outer cylindrical metal wall 1 are provided with outer cover plates to fix the intermediate dielectric layer 4 in the resonant cavity, which is characterized in that: The layer...

Embodiment 2

[0079] see Figure 1 to Figure 19 , the present embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0080] The depth of the coaxial digging hole 5 at the open-circuit end can be adjusted by the overhang of the tuning screw 6, one end of the coupling screw 12 is also connected to the outer cover plate, and the other end of the coupling screw 12 is overhanging and probed into the opening gap 11. The depth is also adjustable, and the size of the coupling rod 14 cannot be adjusted when it is determined to be processed after simulation. In this embodiment, according to the needs of specific resonator design and manufacture, the tuning screw 6 and the coupling screw 12 can be welded on the outer cover plate, or the tuning screw 6 and the coupling screw 12 can be connected to the outer layer through a mechanical connection mechanism. The layer cover plate is fixedly connected, which is convenient for tuning and strengthens the coupling effect...

Embodiment 3

[0082] see Figure 1 to Figure 19 , this embodiment is basically the same as Embodiment 1 and Embodiment 2, and the special features are:

[0083] said Figure 13 is the topology structure diagram of the SIR coaxial cavity dual-band filter, a , b , c , d For 4 passband coaxial cavity resonators, a ', b ', c ', d' are 4 stopband coaxial cavity resonators, Figure 14 for corresponding to Figure 13 Vertical view of SIR coaxial cavity dual-band filter topology, a , b , c , d , a ', b ', c ', d' are corresponding to Figure 4 The SIR coaxial resonant cavity has the same size except for the insertion depth of the tuning screw 6. In (Out) means that the signal input (output) structure corresponds to Figure 5 or Image 6 8 and 9 in. K indicates that there is a magnetic coupling between the two resonators corresponding to Figure 9 In the 11 and 12 structures, -K indicates that there is an electrical coupling between the two resonators corresponding to Figure 11...

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Abstract

The invention discloses a double frequency band filter of a SIR coaxial cavity. The double frequency band filter of the SIR coaxial cavity comprises a CQ-type topological structure formed by coupling of a coaxial SIR in magnetic and galvanic modes. The coaxial SIR is composed of a rod-shaped inner layer metal transmission line, an outer layer barrel-shaped metal wall and a middle medium layer, wherein the outer layer barrel-shaped metal wall shares the same axis with the inner layer metal transmission line which is formed by connecting of two coaxial transmission lines with different diameters. A terminal opening end coaxial borehole is formed at the top end of a terminal opening end of the metal transmission line, and a tuning screw is placed at the top end of the terminal opening end of the metal transmission line to tune. The double frequency band filter is provided with the CQ-type topological structure of 8 cavities, two transmission zeroes are generated on the outside of a double frequency band, so that out-of-band suppression performances are greatly improved. Compared with a traditional duplexer, the double frequency band filter is improved on the aspects of size miniaturization and design complexity in quality mode. The double frequency band filter has the advantages of being small, low in insertion loss, high in double frequency selection properties and the like. The demands on filter performances by a modern communication system are met, and the double frequency band filter can be widely applied in double frequency band mobile communication systems.

Description

Technical field [0001] The present invention involves a dual -frequency strap filter applied in the field of wireless communication, which specifically involves a dual -frequency strap filter that can realize miniaturization and high -performance SIR.The volume of the filter to increase the integration of the base station system. Background technique [0002] The transmitted and receiving end in the 3G communication system requires filtering devices. The quality of the microwave filter directly affects the quality of the entire communication system.At present, the low -frequency band of radio frequency and microwave bands is the main application frequency domain of the mobile communication system, which makes the spectrum resources very crowded, improve the use of spectrum utilization to become a research hotspot, and develop frequency selection devices with dual -frequency characteristics. [0003] The advantages of coales cavity filter have the advantages of large power capacit...

Claims

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Application Information

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IPC IPC(8): H01P1/212
Inventor 李国辉胡海平程孝奇鉴浩周华伟
Owner SHANGHAI UNIV
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