A tunable open ring coupling structure and its application in fully tunable bandpass filter

2019 ◽  
Vol 11 (08) ◽  
pp. 782-786
Author(s):  
Zhonghai Zhang ◽  
Fei Zhao ◽  
Aiting Wu
Keyword(s):  
Bandpass Filter ◽  
Design Procedure ◽  
Tunable Filter ◽  
Operating Frequency ◽  
Coupling Structure ◽  
Open Ring ◽  
Tunable Coupling ◽  
Tunable Resonator ◽  
Good Agreement ◽  
Tunable Bandpass Filter

AbstractThis letter presents a novel tunable coupling structure to simplify the design complexity of the miniaturized fully tunable filter by using open ring and varactors. Based on the proposed novel tunable coupling structure, a fully tunable bandpass filter is implemented with independently tunable operating frequency and bandwidth. The tunable resonator and tunable coupling structure can be easily combined to improve Out-of-band suppression performance. The design procedure of a fully tunable bandpass filter consists of five tunable cavities and tunable coupling rings is also proposed. A prototype of the proposed fully tunable filter is built to verify the design experimentally. Good agreement between simulated and measured results is obtained.

Bandwidth Balancing Design of Miniaturized Tunable Coaxial Cavity Filter

2010 ◽  
Vol 40-41 ◽  
pp. 453-456
Author(s):  
Xin Hui Wu ◽  
Jing Li ◽  
Chang Hai Qin ◽  
Zhong Hai Zhang
Keyword(s):  
Insertion Loss ◽  
Bandpass Filter ◽  
Tunable Filter ◽  
Theoretic Analysis ◽  
High Quality ◽  
Coaxial Cavity ◽  
Coupling Structure ◽  
Novel Model

This paper proposes a method of the coupling modal, which is able to miniaturize the tunable cavity filter while keeping its bandwidth balancing. The filter consists of a tunable cavity dual-bandpass filter and a triangular twin-loop as its inter-cavities coupling structure. We analyzed and calculated the bandwidth of the filter changing with the size and position of the triangular twin-loop. To prove the advancement of the design, a tunable coaxial cavity dual-bandpass filter operating at 230MHz and 409MHz was fabricated and measured. The size is less then a half that of the conventional tunable filter with same specifications. The insertion loss is lower than 1.2dB at operating frequencies. And the bandwidth in lowband and highband are both more than 2.5MHz with the insertion loss less then 3dB. Experiment results and theoretic analysis agree well. This novel model can contribute to the miniaturization of RF and microwave systems with high quality.

scholarly journals High Selectivity Dual-Band Bandpass Filter with Tunable Lower Passband

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Wei-Qiang Pan ◽  
Xiao-Lan Zhao ◽  
Yao Zhang ◽  
Jin-Xu Xu
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Dual Band ◽  
Transmission Zeros ◽  
Resonant Modes ◽  
Novel Method ◽  
Good Agreement ◽  
Tunable Bandpass Filter

This paper presents a novel method to design dual-band bandpass filters with tunable lower passband and fixed upper passband. It utilizes a trimode resonator with three controllable resonant modes. Discriminating coupling is used to suppress the unwanted mode to avoid the interference. Varactors are utilized to realize tunable responses. The bandwidth of the two bands can be controlled individually. Transmission zeros are generated near the passband edges, resulting in high selectivity. For demonstration, a tunable bandpass filter is implemented. Good agreement between the prediction and measurement validates the proposed method.

scholarly journals Frequency-Tunable and Pattern Diversity Antennas for Cognitive Radio Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
A. H. Ramadan ◽  
J. Costantine ◽  
Y. Tawk ◽  
C. G. Christodoulou ◽  
K. Y. Kabalan
Keyword(s):  
Cognitive Radio ◽  
Bandpass Filter ◽  
Microstrip Antennas ◽  
Open Loop ◽  
Tunable Filter ◽  
Radiation Characteristics ◽  
Wideband Antenna ◽  
Pattern Diversity ◽  
Frequency Tunable ◽  
Good Agreement

Frequency-tunable microstrip antennas, for cognitive radio applications, are proposed herein. The approach is based on tuning the operating frequency of a bandpass filter that is incorporated into a wideband antenna. The integration of an open loop resonator- (OLR-) based adjustable bandpass filter into a wideband antenna to transform it into a tunable filter-antenna is presented. The same technique is employed to design a cognitive radio pattern diversity tunable filter-antenna. A good agreement between the simulated and measured results for the fabricated prototypes is obtained. The radiation characteristics of each designed tunable filter-antenna are included herein.

Tunable Balanced Bandpass Filter with High Common-mode Suppression Based on SLSRs

Frequenz ◽  
2017 ◽  
Vol 71 (11-12) ◽  
Author(s):  
Feng Wei ◽  
Xin Yi Wang ◽  
Dun Wei Liao ◽  
Xiao Wei Shi
Keyword(s):  
Frequency Band ◽  
Design Theory ◽  
Bandpass Filter ◽  
Design Procedure ◽  
Operating Frequency ◽  
Differential Mode ◽  
Common Mode ◽  
Operating Frequency Band ◽  
Mode Suppression ◽  
Transition Structures

AbstractA tunable balanced bandpass filter (BPF) with a good common-mode (CM) suppression based on slotline resonators is proposed in this letter. Two novel stub-loaded slotline resonators (SLSRs) terminated with varactors are designed to obtain tunable differential-mode (DM) responses. It is found that a high and wideband CM suppression can be achieved by employing balanced stepped-impedance microstrip-slotline transition structures. Moreover, the DM passbands are independent from the CM ones, which can significantly simplify the design procedure. To validate the design theory, a compact tunable balanced BPF with an operating frequency band ranging from 3.09 GHz to 3.6 GHz is designed and fabricated. The measured results are found to agree well with the simulated ones.

Electronically Reconfigurable Varactor-Loaded HMSIW Bandpass Filter

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 227-230
Author(s):  
Jing-Pan Song ◽  
Xin-Yi Wang ◽  
Feng Wei ◽  
Xiao-Wei Shi
Keyword(s):  
Reverse Bias ◽  
Tuning Range ◽  
Bandpass Filter ◽  
Tunable Filter ◽  
Ring Resonators ◽  
Reverse Bias Voltage ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Filter Size ◽  
Good Agreement

AbstractA varactor-loaded half-mode substrate integrated waveguide (HMSIW) reconfigurable bandpass filter (BPF) is proposed in this paper. The proposed BPF is composed of complementary split-ring resonators (CSRRs) and varactors. Meanwhile, a nonmetalized via is employed in the center of the CSRR. It is noted that the varactor is embedded into the nonmetalized via, which can significantly reduce the tunable filter size. By changing the reverse bias voltage of the varactor, the resonant frequency of the proposed filter can be adjusted. Moreover, low insert loss (IL) and wide tuning range can be achieved. In order to validate its practicability, a BPF with the frequency ranging from 1.9 GHz to 2.5 GHz is fabricated and good agreement between the simulated and measured results is observed.

A Balanced Dual-Band BPF with High CM Suppression and Improved Selectivity

Frequenz ◽  
2019 ◽  
Vol 73 (7-8) ◽  
pp. 261-265
Author(s):  
Feng Wei ◽  
Hao-Jie Yue ◽  
Xiao-Wei Shi
Keyword(s):  
Design Procedure ◽  
Ring Resonators ◽  
Dual Band ◽  
Design Strategies ◽  
Differential Mode ◽  
Split Ring ◽  
Transmission Zeros ◽  
Coupling Structure ◽  
Transition Structures ◽  
Good Agreement

Abstract In this paper, a balanced dual-band bandpass filter (BPF) is designed based on microstrip folded stepped impedance split ring resonators (SISRRs) and balanced microstrip/slotline transition structures. The center frequencies and the fractional bandwidths (FBWs) of the two differential-mode (DM) passbands can be tuned by changing the physical lengths of two SISRRs and the gaps between the two resonators, respectively. The balanced microstrip/slotline transition structures can achieve a wideband common-mode (CM) suppression. Moreover, the DM passbands are independent from the CM responses, which significantly simplifies the design procedure. In addition, due to 0-degree feed structure and cross coupling structure, more transmission zeros can be realized, which can improve the passbands selectivity greatly. In order to validate the design strategies, a balanced dual-band BPF centered at 2.47 GHz and 5.21 GHz was fabricated and a good agreement between the simulated and measured results is observed.

A Compact Quad-Band Bandpass Filter Based on Defected Microstrip Structure

Frequenz ◽  
2017 ◽  
Vol 71 (7-8) ◽  
Author(s):  
Lei Chen ◽  
Xiao Yan Li ◽  
Feng Wei
Keyword(s):  
Bandpass Filter ◽  
Band Pass Filter ◽  
Pass Filter ◽  
High Isolation ◽  
Transmission Zeros ◽  
Passive Devices ◽  
Coupling Structure ◽  
Band Pass ◽  
Microstrip Structure ◽  
Good Agreement

AbstractA compact quad-band band-pass filter (BPF) based on stub loaded resonators (SLRs) with defected microstrip structure (DMS) is analyzed and designed in this paper. The proposed resonator is created by embedding DMS into the SLR and can achieve four narrow passbands. By employing the pseudointerdigital coupling structure between the two resonators, transmission zeros among each passband are generated to improve the passband selectivity and a high isolation is achieved. In order to validate its practicability, a prototype of a quad-band BPF centred at 1.57, 2.5, 4.3 and 5.2 GHz is designed and fabricated. The proposed filter is more compact due to the slow-wave characteristic of DMS. The simulated and measured results are in good agreement with each other. In addition, the DMS idea can be extended to the design of other microstrip passive devices.

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.

scholarly journals A UHF THIRD ORDER 5-BIT DIGITAL TUNABLE BANDPASS FILTER BASED ON MIXED COUPLED OPEN RING RESONATORS

2016 ◽  
Vol 64 ◽  
pp. 89-96
Author(s):  
Mingye Fu ◽  
Qian-Yin Xiang ◽  
Dan Zhang ◽  
Dengyao Tian ◽  
Quanyuan Feng
Keyword(s):  
Bandpass Filter ◽  
Ring Resonators ◽  
Third Order ◽  
Open Ring ◽  
Tunable Bandpass Filter
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