High Performance Single-Ended Wideband and Balanced Bandpass Filters Loaded With Stepped-Impedance Stubs

Wu, Yongle; Cui, Liwei; Zhang, Weiwei; Jiao, Lingxiao; Zhuang, Zheng; Liu, Yuanan

doi:10.1109/access.2017.2695220

Cited by 37 publications

(12 citation statements)

References 24 publications

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“…Table 1 compares the performance of the proposed filter with other planar microstrip wideband filters published recently. Compared to the cited References 1‐11 the proposed filter has a significantly sharper selectivity, comparable passband insertion‐loss, and a significantly wider stopband. In particular, the selectivity factor of the proposed filter of 93% is much better than that obtained with the high‐temperature superconductor bandpass filter whose selectivity is 87.9% 11 .…”

Section: Wideband Microstrip Bandpass Filter Fabrication and Resultsmentioning

confidence: 99%

High selectivity wideband BPF with very wide stopband characteristic

Riaz¹,

Virdee

Alibakhshikenari

et al. 2020

Int J RF Microw Comput Aided Eng

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This paper describes the design and evaluation of a highly selective wideband microstrip bandpass filter with a near brick‐shaped transmission response and a very wide stopband characteristic. The proposed filter structure excites multimode resonances that combine to realize a wideband filter response and excited too are transmission zeros that create a highly selective filter with wideband suppression in the upper and lower stopbands. The filter configuration comprises electromagnetically coupled resonators that are stub loaded. The input and output feedlines are interdigitally coupled to the resonators. Measured results confirm the low‐loss and via‐free wideband filter exhibits an elliptical response with a wide stopband with a rejection greater than 30 dB. The selectivity factor and stopband performance of the proposed filter is better than that obtained with the high‐temperature superconductor (HTS) filters. Design of the filter is relatively simple and easy to manufacture using standard PCB technology. There is good correlation between the simulation and measured results. The proposed wideband bandpass filter is suitable for applications in high interference environments and cognitive radio systems.

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Section: Wideband Microstrip Bandpass Filter Fabrication and Resultsmentioning

confidence: 99%

High selectivity wideband BPF with very wide stopband characteristic

Riaz¹,

Virdee

Alibakhshikenari

et al. 2020

Int J RF Microw Comput Aided Eng

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show abstract

“…Because of the desired properties, i.e., low cost and profile, compact size, and easy integration with other devices, the microstrip filters have been extensively used in the wireless communications systems, such as, 4G, WiFi, and sensing radars. To satisfy different requirements, the microstrip filters with individual characteristics have been designed, including low-pass filters [1], wideband bandpass filters (BPFs) [2]- [4], balanced BPFs [5]- [7], multi-band BPFs [8]- [11], and high-pass filters [12].…”

Section: Introductionmentioning

confidence: 99%

Design of Notched-Wideband Bandpass Filters With Reconfigurable Bandwidth Based on Terminated Cross-Shaped Resonators

Zhang

Wong

et al. 2020

IEEE Access

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In this paper, a series of novel reconfigurable-bandwidth notched-wideband bandpass filters (NWB BPFs) with controllable notch bands are proposed. The proposed filters start from a passive filtering structure, which is formed by a terminated cross-shaped resonator (TCSR) with a pair of parallel-coupled lines and two open-ended stubs. Theoretical analysis finds that the filter bandwidth can be independently controlled by the TCSR, while the center frequencies and bandwidth of notch bands are mainly controlled by the rest parts. According to this, a BPF with controllable notch bands can be designed. To achieve the reconfigurable-bandwidth NWB BPFs with controllable notch band, whose bandwidth and center frequency can be maintained unchanged under different work states, two PIN diodes and a varactor are employed. By controlling the work states of PIN diodes, three bandwidth states can be achieved with fixed center frequency. By controlling the applied voltage on the varactor, other NWB BPF with independently tunable lower passband edge can be realized. For verification, three prototypes are designed and measured. The measured results agree well with the theoretical analysis and simulated ones, verifying a simple and effective design approach of reconfigurable-bandwidth NWB BPFs. INDEX TERMS Notched-wideband bandpass filter (NWB BPF), terminated cross-shaped resonator, PIN diode and varactor, reconfigurable bandwidth, controllable notch bands. XIAO ZHANG (Member, IEEE) was born in Gaozhou, China. He received the B.Eng. degree in information engineering and the M.Eng. degree in communication and information systems from the

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“…As an extension here, two additional short circuited stubs are connected to the square loop to implement a compact wideband BPF, with equiripple response in both delay and magnitude simultaneously. The stub‐load technique is popular for BPF design in recent years, however, the delay responses are still uncontrolled in those configurations. The detailed discussion about the proposed filter is in the following parts.…”

Section: Introductionmentioning

confidence: 99%

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

Jin

Huang

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

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It is shown that a stub loaded square loop filter, composed of six sections of commensurate transmission line, can achieve equiripple response in both magnitude and group delay simultaneously, when the admittances of the lines are properly chosen. Design formulas are given to calculate the admittances by given specifications such as fractional bandwidth and in‐band magnitude ripple. An interesting property of this filter is that the group delay can be adjusted while the in‐band magnitude response keeps almost unchanged. For verification, a filter sample is designed, fabricated and measured. In experiment, it exhibits a delay variation of 0.22 ns and minimal insertion loss of 0.21 dB within its passband (|S11| < −13.8 dB) from 0.48 to 1.52 GHz, which agree well with the theoretical predictions.

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High Performance Single-Ended Wideband and Balanced Bandpass Filters Loaded With Stepped-Impedance Stubs

Cited by 37 publications

References 24 publications

High selectivity wideband BPF with very wide stopband characteristic

High selectivity wideband BPF with very wide stopband characteristic

Design of Notched-Wideband Bandpass Filters With Reconfigurable Bandwidth Based on Terminated Cross-Shaped Resonators

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

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