scholarly journals Design of 2.4 GHz Microwave Bandpass Filter

2019 ◽  
pp. 773-779
Author(s):  
Mohanad Abdulhamid ◽  
Atanasio Mugambi
Keyword(s):  
Development Process ◽  
Bandpass Filter ◽  
Filter Design ◽  
Cross Coupling ◽  
Bandpass Filters ◽  
Software Tools ◽  
Open Loop ◽  
Design Approach ◽  
Single Pair ◽  
Coupled Lines

This paper presents in detail the design of highly selective microstrip bandpass filters that consist of microstrip open-loop resonators with a cross coupling that exhibit a single pair of attenuation poles at finite frequencies. The design approach enables one to use advanced fullwave EM simulators to complete the filter design, namely, to determine the physical dimensions of the filter. The results acquired through research & development process are simulated, analyzed and verified by using parallel-coupled lines filter topology, which are later, enhanced by various value-aided software tools such as MATLAB-7.0, CorelDraw-12, Microwave Office-2012

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.

Novel Dual-band Bandpass Filter Design Using Microstrip Open-loop Resonators

2008 ◽  
Vol 22 (2-3) ◽  
pp. 219-225 ◽  
Author(s):  
X.-W. Dai ◽  
C.-H. Liang ◽  
B. Wu ◽  
J.-W. Fan
Keyword(s):  
Bandpass Filter ◽  
Filter Design ◽  
Open Loop ◽  
Dual Band

Two- and Four-Pole Multilayer SIW Filter with High Selectivity and Higher-Order Mode Suppression

Frequenz ◽  
2019 ◽  
Vol 73 (5-6) ◽  
pp. 209-217 ◽  
Author(s):  
Dinghong Jia ◽  
Quanyuan Feng ◽  
Qianyin Xiang
Keyword(s):  
High Selectivity ◽  
Filter Design ◽  
Design Method ◽  
Single Layer ◽  
Cross Coupling ◽  
Bandpass Filters ◽  
Coupling Scheme ◽  
Transmission Zeros ◽  
Compact Size ◽  
Spurious Mode

Abstract This letter presents an approach to design two-pole source-load coupling and four-pole cross-coupling substrate integrated waveguide (SIW) bandpass filters based on multilayer process. Utilizing the field distribution, the vertical magnetic and electric coupling of fundamental mode is designed by suppressing the first spurious mode. Then, source-load and cross-coupling schemes are realized with controllable features in two-pole and four-pole filters, respectively. The harmonic passband produced by TE102 mode can be suppressed by proper coupling technique enabling the connection with TE102 mode in two- and four-pole filter designs, respectively. Three transmission zeros, which are derived from source-load coupling, are introduced around the passband of two-pole filter to improve its selectivity. In the four-pole filter design, a six-order cross-coupling scheme including source and load produces four transmission zeros around the passband, leading to a sharp selectivity. In addition, another transmission zero is generated at the adjacent location of the passband to improve the out-of-band rejection. Compared with conventional horizontally coupled filters made of single layer, the proposed filters show a compact size. To demonstrate the proposed design method, a two-pole and a four-pole double-layered SIW bandpass filters are fabricated and measured. Measured results show that the proposed filters exhibit high selectivity and good out-of-band rejection, as well as a good agreement between simulated and measured results.

scholarly journals Quasi-Reflectionless Microstrip Bandpass Filters With Improved Passband Flatness and Out-of-band Rejection

2020 ◽  
Author(s):  
Xiaohu Wu ◽  
Yingsong Li ◽  
Xiaoguang Liu
Keyword(s):  
Impedance Matching ◽  
Cross Coupling ◽  
Bandpass Filters ◽  
Output Analysis ◽  
Design Concepts ◽  
Frequency Responses ◽  
Transmission Zeros ◽  
Prior Art ◽  
Coupled Lines ◽  
Stopband Attenuation

High-order quasi-reflectionless bandpass filters with improved passband flatness and good impedance matching both in-band and out-of-band are proposed in this work. The proposed design consists of conventional coupled-lines bandpass sections loaded with the presented absorptive stubs at the input and output. Analysis shows that the absorptive stub is equivalent to a 2-pole bandstop filter. Compared to the prior art, the higher-order nature of the presented absorptive stub enables a flatter passband and better out-of-band rejection. The overall filter stopband attenuation can be readily improved by increasing the number of coupled-lines sections without altering the passband responses. Furthermore, cross-coupling between the two absorptive stubs can be used to improve the out-of-band rejection by introducing two transmission zeros without affecting the absorption characteristics. The proposed design concepts are experimentally validated by the design and fabrication of a set of 2.4-GHz 1-, 2-, and 3-pole microstrip quasi-reflectionless bandpass filters. Measured frequency responses of these filters closely match those of the simulation.

A Quasi-Elliptic Bandpass Filter-Integrated Single-Pole Double-Throw Switch

Frequenz ◽  
2017 ◽  
Vol 71 (5-6) ◽  
Author(s):  
Yu-Xue Ji ◽  
Jin Xu ◽  
Zhao-Zhao Li ◽  
Huan Wang ◽  
Jin-Jie Huang
Keyword(s):  
Insertion Loss ◽  
Bandpass Filter ◽  
Impedance Matching ◽  
Bandpass Filters ◽  
Design Approach ◽  
Fractional Bandwidth ◽  
Central Frequency ◽  
Low Insertion Loss ◽  
Parallel Configuration

AbstractThis paper proposes a quasi-elliptic bandpass filter-integrated single-pole double-throw (SPDT) switch. The series-parallel configuration of p-i-n diodes embedded into the impedance matching circuit is proposed to combine two quasi-elliptic response bandpass filters to constitute the proposed SPDT switch. To validate our design approach, a proposed quasi-elliptic bandpass filter-integrated SPDT switch is designed and fabricated with a central frequency of 1.25 GHz and a 3 dB fractional bandwidth of 16 %. Low insertion loss in the on state and good isolation in the off state are achieved. The switch size including bias circuits but excluding feeding lines is 0.447λ

Ultra-Wideband (UWB) Bandpass Filter Using Multi-Mode SIR

2013 ◽  
Vol 760-762 ◽  
pp. 241-245
Author(s):  
Jian Kang Xiao ◽  
Wu Zhu ◽  
Yong Li ◽  
Wei Zhao
Keyword(s):  
Return Loss ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Ultra Wideband ◽  
Input And Output ◽  
Quarter Wavelength ◽  
Coupled Lines ◽  
Multi Mode ◽  
Multiple Transmission

New ultra-wideband (UWB) bandpass filters are proposed by using stepped-impendence resonators (SIRs) and stub-loaded SIRs, aiming at transmitting the signals in the whole UWB passband of 3.1GHz-10.6GHz. Each of the proposed UWB filters consists of two parallel but oppositely arranged compact SIR with tri or quad-section or stub-loaded SIR. In the design, the first two or three resonances of the proposed resonators are properly adjusted to be placed within the UWB. In order to enhance the coupling degree, pairs of quarter-wavelength parallel-coupled lines are longitudinally stretched in both the input and output sides. The UWB bandpass filters behave multiple transmission poles and good return loss of no less than 15dB. A proposed UWB filter is fabricated and measured, and the experiment demonstrates the design.

Dual-mode dual-band bandpass filter design using open-loop resonators

2012 ◽  
Vol 54 (10) ◽  
pp. 2370-2372 ◽  
Author(s):  
Haiwen Liu ◽  
Yulong Zhao ◽  
Liyun Shi ◽  
Hui Luo
Keyword(s):  
Bandpass Filter ◽  
Filter Design ◽  
Open Loop ◽  
Dual Band ◽  
Dual Mode
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