A Simple Compact Microstrip Wideband Bandpass Filter

2013 ◽  
Vol 760-762 ◽  
pp. 236-240
Author(s):  
Jian Kang Xiao ◽  
Wu Zhu ◽  
Yong Li ◽  
Wei Zhao
Keyword(s):  
Bandpass Filter ◽  
Bandpass Filters ◽  
Size Reduction ◽  
Transmission Zeros ◽  
Good Agreement

Two wideband bandpass filters with miniature size and wide stopband are proposed by using cascaded U-shaped resonators. The filters exhibit bandwidths of 31.1% and 28.8% at about 5.3GHz and 5.6GHz, respectively. Both designed filters have simple structures and compact sizes, wide passband, excellent out-band performance with wide lower and upper stopbands, and a pair of transmission zeros on both sides of passband. The new designs have evident circuit size reduction compared with relative reports. A wideband microstrip BPF is fabricated and measured, and the measurement exhibits good agreement with the prediction.

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 Transversely Compact Single-Ended and Balanced Bandpass Filters with Source–Load-Coupled Spurlines

Electronics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 416 ◽  
Author(s):  
Fang Yan ◽  
Yong Mao Huang ◽  
Tao Huang ◽  
Shuai Ding ◽  
Kenian Wang ◽  
...  
Keyword(s):  
Bandpass Filter ◽  
Signal Transmission ◽  
Wireless Systems ◽  
Bandpass Filters ◽  
Coupling Scheme ◽  
Passive Components ◽  
Differential Signal ◽  
Transmission Zeros ◽  
Stepped Impedance Resonator ◽  
Good Agreement

Multi-function wireless systems demand multi-channel transmit/receive (TR) modules, particularly as multiple functions are required to operate simultaneously. In each channel, passive components, including bandpass filters, must be compact, or at least transversely compact; thus, the entire circuitry of the channel will be slender, and consequently multiple channels can be parallel-arranged conveniently. In this work, single-ended and balanced bandpass filters for multi-channel applications are presented. As a unique resonator, the U-shaped stepped impedance resonator (USIR) can achieve size miniaturization compared with its corresponding uniform impedance resonator (UIR) counterpart. Hence, with the utilization of USIRs, the proposed bandpass filters are able to acquire compact transverse sizes. Moreover, by using the source–load coupling scheme, two transmission zeros (TZs) are respectively generated at the lower and upper sides of the passbands, which is useful for improvement of the selectivity performance. In addition, spurlines are introduced at the input and output ports to produce another TZ to further enhance the stopband performance, which cannot be acquired by the UIR or stepped impedance resonator (SIR). To verify the aforementioned idea, one single-ended and one balanced bandpass filter are implemented, with experimental results in good agreement with the corresponding simulations. Meanwhile, as compared with some similar works, the proposed balanced filter achieves compact transverse size, sharp selectivity skirt, and wide stopbands up to the fourth-order harmonic with suppression over 20 dB, which illustrates its suitability for differential signal transmission application in microwave circuits and systems.

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.

Compact dual-mode microstrip bandpass filter based on slotted square patch resonator

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Karthie S. ◽  
Zuvairiya Parveen J. ◽  
Yogeshwari D. ◽  
Venkadeshwari E.
Keyword(s):  
Bandpass Filter ◽  
Filter Design ◽  
Center Frequency ◽  
Dual Mode ◽  
Content Type ◽  
Transmission Zeros ◽  
Compact Size ◽  
Mode Response ◽  
Better Than ◽  
Good Agreement

Purpose The purpose of this paper is to present the design of a compact microstrip bandpass filter (BPF) in dual-mode configuration loaded with cross-loop and square ring slots on a square patch resonator for C-band applications. Design/methodology/approach In the proposed design, the dual-mode response for the filter is realized with two transmission zeros (TZs) by the insertion of a perturbation element at the diagonal corner of the square patch resonator with orthogonal feed lines. Such TZs at the edges of the passband result in better selectivity for the proposed BPF. Moreover, the cross-loop and square ring slots are etched on a square patch resonator to obtain a miniaturized BPF. Findings The proposed dual-mode microstrip filter fabricated in RT/duroid 6010 substrate using PCB technology has a measured minimum insertion loss of 1.8 dB and return loss better than 24.5 dB with a fractional bandwidth (FBW) of 6.9%. A compact size of 7.35 × 7.35 mm2 is achieved for the slotted patch resonator-based dual-mode BPF at the center frequency of 4.76 GHz. As compared with the conventional square patch resonator, a size reduction of 61% is achieved with the proposed slotted design. The feasibility of the filter design is confirmed by the good agreement between the measured and simulated responses. The performance of the proposed filter structure is compared with other dual-mode filter works. Originality/value In the proposed work, a compact dual-mode BPF is reported with slotted structures. The conventional square patch resonator is deployed with cross-loop and square ring slots to design a dual-mode filter with a square perturbation element at its diagonal corner. The proposed filter exhibits compact size and favorable performance compared to other dual-mode filter works reported in literature. The aforementioned design of the dual-mode BPF at 4.76 GHz is suitable for applications in the lower part of the C-band.

Multilayer SIW Dual-Band Filters with Independent Band Characteristics and High Selectivity

Frequenz ◽  
2019 ◽  
Vol 73 (9-10) ◽  
pp. 293-300
Author(s):  
Dinghong Jia ◽  
Jianqin Deng ◽  
Yangping Zhao ◽  
Ke Wu
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Large Range ◽  
Metal Layer ◽  
Dual Band ◽  
Effective Dimension ◽  
Dual Mode ◽  
Transmission Zeros ◽  
Design Freedom ◽  
Good Agreement

Abstract This work presents an approach to developing dual-mode dual-band substrate integrated waveguide (SIW) bandpass filter based on multilayer process. TE102/TE201 and TE101/TE102 modes are used to feature the two passbands, respectively. To begin with, large range of band location ratios are decided by the effective dimension of the SIW resonator. With reference to the field distribution, independent coupling schemes of the dual-modes are then realized by slots or circular apertures etched on the middle metal layer. It allows to not only introduce a large design freedom of bandwidth but also keep compactness. Finally, source-load and mixed couplings are deployed to produce transmission zeros around the passband in providing a sharp selectivity in the two filters, respectively. The details to independently control the center frequencies and bandwidth of two passbands are also presented. A two-order double-layered and a triple-layered SIW dual-band bandpass filter are prototyped to evaluate the proposed design approach, respectively. Results show a good agreement between simulations and measurements. The proposed filter exhibits flexible design freedom, high selectivity as well as good out-of-band rejection.

scholarly journals Dual-Band Bandpass Filter With Controllable Stopband Bandwidth

2022 ◽  
Vol 9 ◽  
Author(s):  
Nan Wang ◽  
Haokun Wei ◽  
Kun Gao ◽  
Xiting Ruan ◽  
Xiaojian Chen ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Bandpass Filter ◽  
Dual Band ◽  
Lowpass Filter ◽  
Microstrip Filter ◽  
Design Specifications ◽  
Transmission Zeros ◽  
Good Agreement

A novel dual-band bandpass filter (BPF) is proposed with independently controllable transmission zeros (TZs) which can realize widely tunable stopband bandwidth (BW). The planar microstrip filter consists of a three-degree L-C ladder lowpass filter loaded with two unsymmetrical shorted stubs which are used to produce different TZs. By tuning the parameters of the two unsymmetrical shorted stubs, the TZs can be independently controlled. Therefore, the BPF has independent controllable center frequencies (CFs), passband bandwidths, and stopband bandwidths between adjacent passbands. All the L-C values in the equivalent circuit of the proposed filter are optimized to fulfill the design specifications. For demonstration, a dual-band BPF is designed. The measured results show good agreement with the simulated ones.

scholarly journals Harmonic-Rejection Compact Bandpass Filter Using Defected Ground Structure for GPS Application

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Haiwen Liu ◽  
Baoping Ren ◽  
Xiang Xiao ◽  
Zhichong Zhang ◽  
Shen Li ◽  
...  
Keyword(s):  
Design Methodology ◽  
Bandpass Filter ◽  
Second Order ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Transmission Zeros ◽  
Harmonic Rejection ◽  
Rejection Level ◽  
Better Than ◽  
Good Agreement

A miniaturized bandpass filter (BPF) using defected ground structure (DGS) resonator with the characteristic of harmonic rejection is developed in this paper. The second and third harmonics of the proposed BPF are rejected by the characteristic of stepped-impedance DGS resonator. Moreover, open stubs are established so that two adjustable transmission zeros can independently be created to extend the stopband and improve the rejection level. Finally, a second-order BPF, centered at 1.62 GHz with a stopband extended up to 5.6 GHz and a rejection level better than 20 dB, is designed and implemented for GPS application. A good agreement between simulation and measurement verifies the validity of this design methodology.

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.

Differential BPFs with Multiple Transmission Zeros Based on Terminated Coupled Lines

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 231-235
Author(s):  
Yiming Niu ◽  
Guo Yang ◽  
Wen Wu
Keyword(s):  
Noise Suppression ◽  
Bandpass Filters ◽  
Differential Mode ◽  
Common Mode ◽  
Multiple Zeros ◽  
Transmission Zeros ◽  
Coupled Lines ◽  
Multiple Transmission ◽  
Good Agreement

AbstractDifferential bandpass filters (BPFs) named Filter A and Filter B based on Terminated Coupled Lines (TCLs) are proposed in this letter. The TCLs contributes to not only three poles in differential-mode (DM) for wideband filtering response but also multiple zeros in both DM and common-mode (CM) offering wide DM out-of-band rejection and good CM suppression. Fabricated filters centred at 3.5 GHz with wide DM passband and wideband CM suppression have been designed and measured. The filters improved the noise suppression capability of the communication and radiometer systems. The simulated and measured results are in good agreement.

scholarly journals Pseudo-elliptic narrow bandpass filter using shorted coupled-line of higher order design

2019 ◽  
Vol 14 (1) ◽  
pp. 388
Author(s):  
Mohd Nasiruddin Hushim ◽  
Norfishah Ab Wahab ◽  
Muhammad Farid Abdul Khalid ◽  
Tn. Syarifah Atifah Tn. Mat Zin
Keyword(s):  
Bandpass Filter ◽  
Coupled Line ◽  
Transmission Zeros ◽  
Quarter Wavelength ◽  
Measurement Results ◽  
Coupled Lines ◽  
Tan Δ ◽  
Straight Lines ◽  
Good Agreement ◽  
Narrow Bandpass Filter

This paper presents an implementation of quarter wavelength single-shorted coupled-lines for narrow bandpass filter application. It is shown as a new way of creating a single resonance bandpass filter by inter-connected of two <br /> single-shorted quarter wavelength coupled-line sections. By adding more single-shorted coupled-line into the configuration, the form of halfwavelength resonator can increase the degree of order of the filter. For the design of 4<sup>th</sup> order resonator, the coupledlines are arranged inter-connected to each other forming five-fingers lines layout. Due to the interconnection of the coupledlines, transmission zeros appear at the two stopbands which improves the selectivity of the filter response. Investigation on the parametric of the 4<sup>th</sup> order resonator is conducted to observe the controlling parameters and it’s realiability responses of the resonator. For compactness, five-fingers meandered lines is proposed. It is found that the size of the meandered lines resonator was successfully reduced by 33% compared to the five-fingers straight lines resonator of the same order. For validation of concept, the 4<sup>th</sup> order meandered lines resonator was designed at 1 GHz and fabricated on RO3210 microstrip substrate with characteristics given as h = 1.27 mm, Ɛr = 10.2 and tan δ = 3x10<sup>-3</sup>. The measurement results show good agreement with the simulation results.

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