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A dual-band-pass balanced filter with double-layer structure

A balanced filter and dual-band pass technology, which is applied in the field of wireless communication, can solve the problems of large size and achieve the effects of high selectivity, strong out-of-band suppression ability, and excellent common-mode rejection characteristics

Inactive Publication Date: 2018-04-27
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 3) In 2012, Yen-Ju Lu et al. published a paper titled "A Differential-Mode Wideband Bandpass Filter With Enhanced Common-Mode Suppression Using Slotline Resonator" on IEEE Microwave and Wireless Components Letters to design a broadband balanced filter using slot line resonators The bandwidth of the differential mode -10dB echo reflection reaches 105%, and the common mode rejection reaches more than 47.5dB, but the size of this structure is too large

Method used

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  • A dual-band-pass balanced filter with double-layer structure
  • A dual-band-pass balanced filter with double-layer structure
  • A dual-band-pass balanced filter with double-layer structure

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Embodiment 1

[0035] Such as Figure 1 ~ Figure 3 As shown, the dual-band bandpass balanced filter of this embodiment includes an upper layer structure and a lower layer structure, the upper layer structure includes a first dielectric substrate 1 and a first microstrip line structure 2, and the lower layer structure includes a second dielectric substrate 3 and a The second microstrip line structure 4, the first microstrip line structure 2 is arranged on the top surface of the first dielectric substrate 1, and the second microstrip line structure 4 is arranged on the bottom surface of the second dielectric substrate 3, so A metal sheet 5 is provided between the upper structure and the lower structure;

[0036] The first microstrip line structure 2 includes a first resonator 6, a first step impedance branch 7, a first port feeder 8 and a second port feeder 9, and the first step impedance branch 7 is loaded at the The center of a resonator 6 constitutes an upper-layer single-frequency bandpas...

Embodiment 2

[0046] In this embodiment, a dual-band band-pass balanced filter with a double-layer structure is designed. First, two single-band band-pass balanced filters are designed on the two-layer dielectric substrate (i.e., the first dielectric substrate and the second dielectric substrate in Embodiment 1). , and use slot coupling to synthesize them into a dual-band bandpass balanced filter, using Figure 4 with Figure 5 The odd and even mode method of the step impedance resonator can be analyzed, and the method of designing different passband frequencies can be obtained; for the parameter L i1 The adjustment of can change the frequency of the passband, while adjusting the impedance (admittance) ratio R can improve the performance in the band, such as Image 6 with Figure 7 shown. In order to verify the correctness of the design, a dual-band bandpass balanced filter with center frequencies of 1.9GHz and 2.8GHz was designed and processed, and the dimensions of each part are shown ...

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Abstract

The invention discloses a dual-band bandpass balanced filter with a double-layer structure, which includes an upper structure and a lower structure, the upper structure includes a first dielectric substrate and a first microstrip line structure, and the lower structure includes a second dielectric substrate and a second A microstrip line structure, the first microstrip line structure is arranged on the top surface of the first dielectric substrate, and the second microstrip line structure is arranged on the bottom surface of the second dielectric substrate; the first microstrip line structure includes a first resonator, The first step impedance branch, the first port feeder and the second port feeder, the second microstrip line structure includes the second resonator and the second step impedance branch, the first step impedance branch is loaded on the first resonator The center of the second step impedance branch is loaded on the center of the second resonator; a metal sheet is arranged between the upper structure and the lower structure, and a gap is opened on the metal sheet, and the upper structure is coupled with the lower structure through the gap. The filter of the invention has good in-band performance, strong out-of-band suppression ability and excellent common-mode suppression performance.

Description

technical field [0001] The invention relates to a band-pass balanced filter, in particular to a dual-frequency band-pass balanced filter with a double-layer structure, which belongs to the field of wireless communication. Background technique [0002] Wireless communication technology is playing an increasingly important role in real social life. As an important part of the wireless communication field, the demand for band-pass filters is also increasing. Dual-band band-pass filter (DB-BPF) has received great attention due to its wide application in modern wireless communication systems. Balanced filters have excellent anti-interference ability, so they are widely used in advanced wireless communication systems. Dual-band bandpass balanced filter is one of the current research hotspots. At present, most balanced filters need to introduce additional lumped parameter elements to suppress common-mode interference. Recently, the slot-line structure is mostly used in the desig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
Inventor 任康宇曹俊杰张云楚汪凯陈志涵王世伟唐敏褚庆昕
Owner SOUTH CHINA UNIV OF TECH
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