Design of Dual-Band Bandpass Filters With Fixed and Reconfigurable Bandwidths Based on Terminated Cross-Shaped Resonators

Bi, Xiao‐Kun; Cheng, Teng; Cheong, Pedro; Ho, Sut‐Kam; Tam, Kam‐Weng

doi:10.1109/tcsii.2018.2848667

Cited by 56 publications

(27 citation statements)

References 14 publications

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“…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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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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“…e p-i-n diodes are used as the tuning elements, which can implement three reconfigurable bandwidth states [4]. In [5], the filter is based on the cross-shaped resonator structure with terminal short circuit. e low-frequency band of the first passband can be adjusted by the capacitance value, while the other three band edges remain unchanged.…”

Section: Introductionmentioning

confidence: 99%

Design of Broadband Band-Pass Filter with Cross-Coupled Line Structure

Guan

et al. 2020

International Journal of Antennas and Propagation

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This paper presents a broadband band-pass filter with cross-coupled line structure. The cross-coupled line structure is composed of the parallel coupled lines and an open stub. It can be analyzed by the odd- and even-mode method due to its symmetric structure. There are three transmission poles in the passband and two transmission zeros out of passband. Then, the influence of the impedance parameters on the transmission zeros and transmission poles are analyzed. Then, the physical parameters of the proposed band-pass filter are given. And using HFSS for simulation and optimization, the final insertion loss and return loss of filter are obtained. The simulation and measurement results are in good agreement, which validates the design idea.

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“…Analogous to the design of wideband filters [14,15], an effective method using the multi-mode concept was proposed [16]. To further demonstrate this method, a new wideband SWA is presented in this paper.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Slotted Spherical Waveguide Antenna Based on Multi-Mode Concept

Guo

Zhu

et al. 2020

Electronics

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A wideband slotted spherical waveguide antenna based on the multi-mode concept is presented. The proposed design starts from a metallized spherical cavity fed by a rectangular waveguide. Then, two groups of slots are symmetrically cut on the shell. By suitably choosing the slot dimensions and locations, four radiation modes can be excited in a single radiator and merged with each other, resulting in a wideband radiation characteristic. To verify this, a prototype is designed and fabricated using stereolithography apparatus to achieve a light weight. As the measured fractional bandwidth (FBW) of the proposed antenna can be increased to 70.1% while maintaining stable radiation patterns and high gain, a simple and effective design of wideband slotted waveguide antennas with good radiation characteristics can be validated.

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Design of Dual-Band Bandpass Filters With Fixed and Reconfigurable Bandwidths Based on Terminated Cross-Shaped Resonators

Cited by 56 publications

References 14 publications

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

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

Design of Broadband Band-Pass Filter with Cross-Coupled Line Structure

A Wideband Slotted Spherical Waveguide Antenna Based on Multi-Mode Concept

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