scholarly journals Fully reconfigurable hexagonal-shaped comb-line filterplatform for prototyping and education purposes

2019 ◽  
Vol 12 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Daniel Miek ◽  
Michael Höft
Keyword(s):  
Bandpass Filter ◽  
Cross Coupling ◽  
Input Output ◽  
Coupling Matrix ◽  
Transmission Zeros ◽  
Outer Conductor ◽  
Different Types ◽  
Set Up

AbstractIn this paper, a completely reconfigurable comb-line bandpass filter is presented. Due to the modularity, different standard coupling matrix topologies like the folded form, cascaded triplets, and the cul-de-sac form can be implemented and tested. Circuit-based coupling matrices like the extracted pole topology can easily be realized as well. Different types of input-/output- and cross-couplings can be examined before fabrication of a fixed filter set-up takes place. Furthermore, the proposed filter platform can be used to construct a diplexer. By using different heights of the inner and outer conductor of the coaxial resonators, arbitrary center frequencies in the range between 1 and 4 GHz can be realized. Various types of input couplings are available and proposed here to achieve bandwidths between 10 and 110 MHz. A variety of cross-coupling apertures able to realize transmission zeros are presented as well.

A size-miniaturized bandpass filter with selectivity-enhanced and high harmonic suppression performance

2017 ◽  
Vol 9 (9) ◽  
pp. 1809-1815 ◽  
Author(s):  
Tao Huang ◽  
Zhenhai Shao
Keyword(s):  
Bandpass Filter ◽  
Frequency Synthesizer ◽  
High Harmonic ◽  
Magnetic Coupling ◽  
Cross Coupling ◽  
Harmonic Suppression ◽  
Input Output ◽  
Harmonic Frequency ◽  
Transmission Zeros ◽  
Via Hole

In this paper, a novel microstrip bandpass filter is proposed to enhance sideband selectivity, suppress harmonic frequency up to three-order as well as to keep a miniaturized size for frequency synthesizer application. The filter is constructed by four λ/4 folded stepped-impedance resonators (FSIRs) and two λ/2 stepped-impedance resonators at input/output ports to create three pairs of coupling paths and then to produce three cross-coupling transmission zeros (TZs) as well as to achieve a size miniaturization with 96% reduction compared with the conventional filter. By adding a common grounded metallized via hole among four λ/4 FSIRs of the filter, additional four mixed electric and magnetic coupling paths are set to generate extra four TZs. With these seven TZs, the proposed filter achieves a good sideband selectivity and harmonic suppression. Finally, the filter is designed, fabricated, and measured, its measured results are in well agreement with its simulated results.

New compact quad-passband bandpass filter based on multi-layer substrate technique

2014 ◽  
Vol 7 (6) ◽  
pp. 679-683
Author(s):  
Hung-Wei Wu ◽  
Shih-Hua Huang
Keyword(s):  
Bandpass Filter ◽  
Cross Coupling ◽  
Bottom Layer ◽  
The Other ◽  
Input Output ◽  
Coupling Effects ◽  
Layered Substrate ◽  
Stepped Impedance Resonator ◽  
Multi Mode

A new compact quad-passband bandpass filter (BPF) using multi-mode resonators (MMRs) based on multi-layered substrate technique is proposed. The filter consists of a pair of multi-mode resonators (uniform impedance resonator and stepped impedance resonator) operated at 1.8/3.7 GHz on top layer and the other pair of the multi-mode resonators operated at 2.4/3 GHz on bottom layer. Source–load coupling lines are used to be the input/output (I/O) ports for providing the multi-paths propagations by cross-coupling effects in the filter. Specifically, the operated frequencies of the filter at 1.8/2.4/3/3.7 GHz with bandwidths of 6.7, 8.2, 4.6, and 7.2% are successfully designed and implemented. The proposed filter is useful for the multi-passband filters design, especially when the passbands are needed to be very close.

DESIGN OF MINIATURIZED BANDPASS FILTERS USING QUASI-LUMPED MULTILAYER RESONATORS

2014 ◽  
Vol 23 (06) ◽  
pp. 1450083 ◽  
Author(s):  
DEJAN M. MILJANOVIĆ ◽  
MILKA M. POTREBIĆ ◽  
DEJAN V. TOŠIĆ ◽  
ZORAN STAMENKOVIĆ
Keyword(s):  
Design Methodology ◽  
Bandpass Filter ◽  
Filter Design ◽  
Design Procedure ◽  
Filter Bandwidth ◽  
Transmission Zeros ◽  
Electromagnetic Model ◽  
Different Types ◽  
Novel Design ◽  
Good Agreement

A novel design procedure for a compact multilayer bandpass filter is proposed and examined. The filter is realized using quasi-lumped multilayer resonators. Based on the orientation of these coupled-resonator pairs, a second-order bandpass filter is realized with transmission zeros. In order to achieve a low external quality factor, i.e., a wider filter bandwidth, different types of feeder realization are considered. The design methodology with all relevant steps is presented and the equivalent-circuit of the resonator is also derived and verified. The filter design is simulated using a 3D electromagnetic model and validated by measurements on the fabricated filter. The simulation and experimental results are in good agreement.

Tri-band microstrip bandpass filter using input/output cross coupling

2013 ◽  
Vol 101 (3) ◽  
pp. 405-409 ◽  
Author(s):  
Wenjie Feng ◽  
Liming Gu ◽  
Wenquan Che ◽  
Haidong Chen
Keyword(s):  
Bandpass Filter ◽  
Cross Coupling ◽  
Input Output

scholarly journals Techniques for the generation of multiple additional transmission zeros in H-plane waveguide filters

2020 ◽  
Vol 12 (8) ◽  
pp. 723-732
Author(s):  
Daniel Miek ◽  
Patrick Boe ◽  
Fynn Kamrath ◽  
Michael Höft
Keyword(s):  
Cross Coupling ◽  
Plane Waveguide ◽  
Destructive Interference ◽  
Proof Of Concept ◽  
Filter Order ◽  
Transmission Zeros ◽  
Waveguide Filters ◽  
Set Up ◽  
Good Agreement ◽  
Ku Band

AbstractIn this paper, different techniques for the generation of additional transmission zeros (TZs) in planar waveguide filters are investigated. In the classical theory, TZs are generated only by destructive interference of non-adjacent cavities, limiting the available number of TZs to the filter order itself. However, more approaches for the generation of TZs are known, including bypass-coupling in oversized cavities, frequency-dependent coupling apertures as well as dispersive/resonant TZs which can be realized by the direct source to load cross-coupling. The aim of this paper is to combine several of the strategies in one physical filter set-up to increase the maximal number of TZs beyond the filter order. Different Ku-band fourth-order filter set-ups are presented, showing in total between six and eight real as well as complex TZs. Three filters are manufactured as a proof of concept and compared with the simulation, showing very good agreement.

Miniature UWB Filter Using Three-Quarters Wavelength Resonator with Direct-Connected Feed Method

2012 ◽  
Vol 571 ◽  
pp. 721-724
Author(s):  
Cai Peng
Keyword(s):  
Transmission Lines ◽  
Linear Structure ◽  
Ultra Wideband ◽  
Input Output ◽  
Transmission Zeros ◽  
Full Wave ◽  
Quarter Wavelength ◽  
Ring Structures ◽  
Loss Characteristic ◽  
Better Than

A miniature ultra-wideband (UWB) bandpass filter using three-quarters wavelength resonators is presented in this paper. Direct-connected feed method is employed between the input/output ports and the resonators in order to overcome the shortcomings due to the gap-coupled feed method and produce two transmission zeros in the lower and upper stopbands. On the other hand, two quarter-wavelength matching transmission lines are introduced to the input/output ports to improve the reflection loss characteristic in the passband of the filter. In addition, the resonators are folded to be open ring structures, which are more miniaturized than the conventional linear structure. As a consequence, the filter is compact in size and exhibits good performance. The filter is successfully realized in theory and verified by full wave EM simulation, and simulated frequency response results show that the fabricated filter has an insertion loss of better than 1dB in the passband and two rejections of greater than 25dB in most of the stopbands.

Design of differential-mode bandpass filter with common-mode suppression using ring dielectric resonator

2016 ◽  
Vol 9 (5) ◽  
pp. 1029-1035 ◽  
Author(s):  
Jugul Kishor ◽  
Binod K. Kanaujia ◽  
Santanu Dwari ◽  
Ashwani Kumar
Keyword(s):  
Dielectric Resonator ◽  
High Performance ◽  
Bandpass Filter ◽  
Ring Resonator ◽  
Differential Mode ◽  
Common Mode ◽  
Mode Suppression ◽  
Transmission Zeros ◽  
System A ◽  
Good Agreement

Synthesis of differential-mode bandpass filter (BPF) with good common-mode suppression has been described and demonstrated on the basis of ring dielectric resonator (RDR) for high-performance communication system. A RDR with two pairs of feeding lines has been used to excite TE01δ-mode. This unique combination of feeding lines and the ring resonator creates a differential passband. Meanwhile, TM01δ-mode of the DR can also be excited to achieve common-mode rejection in the stopband. Transmission zeros are created in the lower and upper stopband to further improve the selectivity of the proposed BPF. A second-order differential BPF is designed, fabricated and its performance is measured to validate the concept. There is good agreement between simulated and measured results.

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