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Small differential tee band-pass filter

A filter and differential technology, applied in the field of microwave communication, can solve the problems of difficult independent control bandwidth, narrow common-mode rejection bandwidth, and low suppression level, and achieve good in-band return loss, small size, and obvious suppression Effect

Active Publication Date: 2015-07-29
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the mutual influence between different passbands, it is difficult to independently control the bandwidth of the second and third passbands, and its common mode rejection bandwidth is narrow and the rejection level is low, which limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Differential multi-frequency filters can cover multiple communication standards and effectively suppress common-mode noise, and are increasingly used in modern communication systems. Not only can it be used independently, but it can also be integrated in the front end of the radio frequency system for filtering.

[0029] refer to figure 1 , the present invention is a miniaturized differential three-pass filter, including a microstrip feeder 1, a microstrip dielectric substrate 2, a metal ground plate 3, and a defective ground structure 4, wherein:

[0030] The microstrip dielectric substrate 2 adopts a copper-clad dielectric substrate with a dielectric constant of 2.2 and a thickness of 0.787mm, and its size is 30mm×48.4mm. The upper surface is symmetrically provided with a microstrip feeder 1 with respect to the longitudinal axis; the microstrip feeder 1 includes two U-shaped differential input ports 11 and differential output ports 12 on the same side, and the ports ...

Embodiment 2

[0035] The overall composition of the miniaturized differential three-pass band-pass filter is the same as in Embodiment 1, and different structural parameters are provided below:

[0036] refer to figure 2 , the openings of the outermost complementary split resonant ring 41 and the innermost complementary split resonant ring 43 are provided with mouth edge extensions, and the extensions are provided for the convenience of controlling the center frequencies of the three passbands. The mouth edge extension section of the outermost complementary split resonant ring 41 is located outside the split ring, and the line length is 2.7 mm, which are respectively bent to both sides. The mouth edge extension section of the innermost complementary split resonator ring 43 is located inside the split ring, and the line length is The length is 0.6 mm.

[0037] The wiring on the left and right sides of the complementary split resonant ring 42 in the middle layer and the complementary split ...

Embodiment 3

[0042] The overall composition of the miniaturized differential three-pass band-pass filter is the same as in Embodiment 1-2, and different structural parameters are given below:

[0043] The innermost complementary split resonant ring 43 opens downward, the middle complementary split resonator 42 opens upward, and the outermost complementary split resonant ring 41 opens downward.

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Abstract

The invention discloses a small differential tee band-pass filter and solves the problems of multi-frequency operation of a differential band-pass filter and common-mode noise suppression. The filter comprises a micro band structure, a micro band medium substrate, a metal grounding plate and a defective ground structure; the micro band structure is transversely symmetric about the longitudinal central axis of a filter body; two side U-type differential input and output ports in the same structures are provided and are located on the upper surface of the micro band medium substrate; the defective ground structure is arranged on the metal grounding plate in an etched manner, and the defective ground structure is transversely symmetric about the longitudinal central axis of the filter body and comprises three complementary opened resonant rings, an input clearance line and an output clearance line; the complementary opened resonant rings are embedded mutually in a surrounded manner corresponding to the center of the metal grounding plate from interior to exterior, the input and output clearance lines are in stepped impedance types, and the defective ground structure is reduced accordingly. The differential filter miniaturization is realized, the central frequency and bandwidth of three differential mode pass bands are controlled independently, and the fine broadband common mode suppression features are provided.

Description

technical field [0001] The invention belongs to the technical field of microwave communication, in particular to a differential bandpass filter, in particular to a miniaturized differential three-pass bandpass filter, which can be applied to a multi-frequency communication system in a radio frequency front-end circuit of a wireless communication system. Background technique [0002] In recent years, with the rapid development of mobile communication technology, a communication system often needs to work in multiple communication modes. If a filter is used for each mode, the communication system will be large in size and high in cost, and the multi-frequency filter can It covers multiple communication modes at the same time, occupies a small volume, and has low cost, and has been extensively studied. On the other hand, since the differential filter has a good suppression effect on noise, it can improve the sensitivity of the system and meet the high-quality communication requ...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 魏峰丁晨李姣黄丘林史小卫
Owner XIDIAN UNIV
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