Compact Quad-Band Bandpass Filter Using Double-Diplexing Structure

Frequenz ◽  
2017 ◽  
Vol 71 (11-12) ◽  
Author(s):  
Jin Xu ◽  
Yan Zhu ◽  
Yong-Qian Du
Keyword(s):  
Bandpass Filter ◽  
Dual Band ◽  
Coupled Lines ◽  
Lumped Elements ◽  
Stepped Impedance Resonator ◽  
Channel Filter ◽  
Channel Filters

AbstractThis paper presents a compact quad-band bandpass filter (QB-BPF) using double-diplexing structure, which consists of two channel filters and a pair of modified manifold-coupled lines. Each channel filter is realized by the asymmetrical coupling shorted stub loaded stepped-impedance resonator (SSLSIR) dual-band bandpass filter (DB-BPF), and the modified manifold line constructed by lumped elements is proposed to connect two channel filters to constitute the QB-BPF. The fabricated QB-BPF occupies a compact circuit size of 0.178λ

Novel Spurious Suppression Approach for SIR Dual-band Bandpass Filter Design

Frequenz ◽  
2014 ◽  
Vol 69 (1-2) ◽  
pp. 65-70
Author(s):  
Jianzhong Chen ◽  
Xuefeng Li ◽  
Hongyu Shi ◽  
Anxue Zhang
Keyword(s):  
Bandpass Filter ◽  
Filter Design ◽  
Stop Band ◽  
Design Approach ◽  
Dual Band ◽  
External Quality ◽  
Resonant Frequencies ◽  
Coupling Property ◽  
Spurious Suppression ◽  
Stepped Impedance Resonator

Abstract A new design approach for a stepped impedance resonator (SIR) dual-band bandpass filter (BPF) with high multi-spurious suppression is proposed in this paper. The external coupling property of an SIR at multi-order resonant frequencies is fully studied. Different input impedances at desired frequencies are achieved by optimizing the unequal impedance transformer. The new solution shows the freedom in the choice of tapping point. The external quality values of multi-order harmonics vary with the shift of the tapping position. Wide upper stop-band rejection is realized by mismatching Qe at the unwanted harmonic frequencies, while keeping the Qe suitable for operating dual band to obtain good in-band performance. A traditional dual-band BPF and a novel practical BPF operated at 2.45/5.25 GHz are designed and fabricated to demonstrate the above idea. Good simulated and measured results are presented.

Dual-Band BPF Using Simple SIR Structure

2013 ◽  
Vol 655-657 ◽  
pp. 1614-1618
Author(s):  
Wen Ko ◽  
Man Long Her ◽  
Yu Lin Wang ◽  
Ming Wei Hsu
Keyword(s):  
Transmission Line ◽  
Bandpass Filter ◽  
Low Frequency ◽  
Basic Structure ◽  
Simulation Software ◽  
Dual Band ◽  
Center Frequency ◽  
Resonant Circuit ◽  
In Series ◽  
Stepped Impedance Resonator

This paper studies a very simple structure for dual-band bandpass filter. Filter is composed of two asymmetric coupled resonator circuit by two sets of different size stepped impedance resonator. This circuit applied microstrip line, coupling principle and impedance ratio by controlling the stepped impedance resonator to control the center frequency 2.6/5.2 GHz of the first and the second bandpass filter. The basic structure of the filter is constituted by the three sections of transmission line and two sets of SIR, that is, in two gaps of the three sections of transmission line parallel connection the equivalent inductances and capacitor of the two sets of SIR in series with the resonant circuit (LCL) to constitute bandpass filter. The low frequency 2.6 GHz is through the upper half of low impedance SIR, and the high frequency 5.2 GHz is through the lower half of high impedance SIR. This paper presents the design of asymmetric SIR-based dual-band bandpass filter, the filter structure is simple, easy to produce and can control the characteristics of the passband center frequency. By electromagnet simulation software( IE3D ) to simulate, the actual production of the circuit using a vector analyzer measurement, simulation and measurement results show good consistency.

Compact Dual-band Bandpass Filter Using Coupled Lines Multimode Resonator

2015 ◽  
Vol 25 (4) ◽  
pp. 235-237 ◽  
Author(s):  
Yatao Peng ◽  
Lijun Zhang ◽  
Jun Fu ◽  
Yudong Wang ◽  
Yongqing Leng
Keyword(s):  
Bandpass Filter ◽  
Dual Band ◽  
Coupled Lines

scholarly journals Design and Analysis of a Wide Stopband Microstrip Dual-band Bandpass Filter

2021 ◽  
Vol 9 (2) ◽  
pp. 83-90
Author(s):  
Salah I. Yahya ◽  
Abbas Rezaei ◽  
Yazen A. Khaleel
Keyword(s):  
Bandpass Filter ◽  
Design Method ◽  
Dual Band ◽  
Equivalent Model ◽  
Harmonic Suppression ◽  
Coupled Resonators ◽  
Transmission Zeros ◽  
Novel Structure ◽  
Compact Size ◽  
Coupled Lines

A novel configuration of a dual-band bandpass filter (BPF) working as a harmonic attenuator is introduced and fabricated. The proposed filter operates at 3 GHz, for UHF and SHF applications, and 6.3 GHz, for wireless applications. The presented layout has a symmetric structure, which consists of coupled resonators. The designing of the proposed resonator is performed by introducing a new LC equivalent model of coupled lines. To verify the LC model of the coupled lines, the lumped elements are calculated. The introduced filter has a wide stopband up to 85 GHz with 28th harmonic suppression, for the first channel, and 13th harmonic suppression, for the second channel. The harmonics are attenuated using a novel structure. Also, the proposed BPF has a compact size of 0.056 λg2. Having several transmission zeros (TZs) that improve the performance of the presented BPF is another feature. The proposed dual-band BPF is fabricated and measured to verify the design method, where the measurement results confirm the simulations.

Dual-Band Bandpass Filter with Reduce Center Isolation Using Stub Loaded-Stepped Impedance Resonator

2017 ◽  
Vol 23 (6) ◽  
pp. 5187-5190
Author(s):  
Zuhani Ismail Khan ◽  
Mohd Khairul Mohd Salleh ◽  
Mohd Shafiq Mohamad ◽  
Norfishah Ab Wahab ◽  
Nur Emileen Ab Rashid
Keyword(s):  
Bandpass Filter ◽  
Dual Band ◽  
Stepped Impedance Resonator

scholarly journals Compact dual‐band bandpass filter using coupled lines and shorted stubs

2020 ◽  
Vol 56 (14) ◽  
pp. 721-724 ◽  
Author(s):  
Donghao Li ◽  
Kai‐Da Xu
Keyword(s):  
Bandpass Filter ◽  
Dual Band ◽  
Coupled Lines
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