A Reconfigurable Bandpass Filter Based on a Varactor-Perturbed, T-Shaped Dual-Mode Resonator

Tsai, Hui Lien; Huang, Bo-Chih; Chen, Nan-Wei; Jeng, Shyh‐Kang

doi:10.1109/lmwc.2014.2306893

Cited by 40 publications

(20 citation statements)

References 9 publications

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“…Generally, the frequency agility can be realized via resonance perturbation of the resonant structures using incorporated lumped circuit elements, such as varactor diodes [1 ]- [5]. With these voltage-controlled elements, passband center frequency can be relocated and passband response might be reconfigured.…”

Section: Introductionmentioning

confidence: 99%

“…Early effort has been primarily focused on the development of the BPFs with tunable center frequency/bandwidth, viz. tunable BPFs [l]/reconfigurable BPFs [2]- [5]. For the sake of relevancy, past works on the filters of both center frequency and bandwidth tuning capabilities are outlined herein to highlight performance improvements from this work.…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, the so-called coupling reducers were employed between microstrip comblines for a wide band width tuning range [4]. Recently, the authors exploited the varactor perturbed dual-mode resonator for development of a reconfigurable microstrip BPF [5].With the even-and odd mode resonance perturbations, the BPF has wide center frequency and bandwidth tuning ranges.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to [5], the proposed approach aims to synthesize a compact, tune-all BPF of greater bandwidth tuning capability. With regard to compactness, the quasi-lumped dual-mode resonator is exploited as the main building structure.…”

Section: Introductionmentioning

confidence: 99%

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Tune-all microstrip bandpass filter

Hsu

Chow

Chen

2015

2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

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A compact, varactor-incorporated microstrip bandpass filter of controllable center frequency and bandwidth, as well as reconfigurable response is presented. The quasi lumped dual-mode resonator is adopted for filter compactness, and the incorporated varactors are employed for resonance perturbation and mode coupling control pertinent to frequency agility. Compared to the authors' previous design, the electrical size is significantly reduced (4 times smaller), and the largest to smallest bandwidth ratio (6:1) is greatly extended.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tune-all microstrip bandpass filter

Hsu

Chow

Chen

2015

2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

Self Cite

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“…Compared with all methods mentioned above, varactor diodes have been more widely used to realise reconfigurable filters [43]- [45]. [54], stub-loaded resonators [55] and T-shaped dual-mode resonator [56].…”

Section:  Other Techniquesmentioning

confidence: 99%

Multi-functional and Tunable Microwave Devices and Sub-systems for Wideband Applications

Zhu¹

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Microwave components and sub-systems have been widely investigated in recent years since they play essential roles in microwave systems. With the rapid development and explosive extension of microwave techniques, high speed, large data volume, and electromagnetic compatibility are not the only issues that concern designers, practitioners, and researchers. Features like multi-functionality, reconfigurability, portability, low energy consumption, miniaturization of circuit size and simple construction have come into focus more and more in recent years. Currently, microwave devices are suffering from several drawbacks: huge losses from a lack of integration of individual components, lack of new functionality, poor adaptability to different environments, low efficiency, flexibility and controllability, high cost and energy consumption, and insufficient miniaturization of circuit size.With these existing challenges and the huge call for innovation in microwave components and subsystems, new design approaches and structures are extremely in demand and a high point of focus.This thesis aims to solve some of the current challenges mentioned above by making four main contributions.The first contribution is the development of new design approaches to design microwave devices with multiple functions to replace cascaded devices with a single function. The main target is to reduce the overall number of components used in constructing microwave systems. With a large number of cascaded devices, huge losses will be produced which decrease systems" reliability and overall performance, not to mention the current large circuit volumes, high cost, and energy consumption. Multi-functional componentry is a suitable and proper solution to solve these problems. In wireless microwave systems, power dividers are usually cascaded with bandpass filters, to get rid of unwanted signals and transmit the desired ones. When the number of output terminations is raised, more filters are required, which makes it more difficult for design and implementation. A four-way power divider integrated with filtering characteristics is proposed to replace the cascaded structures. The proposed design shows equal power division, great selection of filtering signals and reduction in device numbers and overall cost.The second contribution is the development of multiple tunable microwave devices which can be controlled and adapted to different environments. An electrical tuning method is used by loading varactors on microstrip lines. To begin with, tunable bandpass filters were investigated to achieve high tunability of both centre frequency and bandwidth. To that end, several new designs with varactor-loaded coupled-line sections were proposed and verified. Relocatable transmission zero was realised to control the cut-off of the passband at two edges. The concept was applied in the II design of a tunable balanced bandpass filter with a wide tuning range and high common-mode suppression. Wideband power dividers with tunable power division at output termi...

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Filtennas for wireless application: A review

Mishra

Lalitha

2019

Int J RF Microw Comput Aided Eng

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In recent year, various filtenna circuits have been developed satisfying the objectives and prerequisites of wireless communication. Some of these developed designs are new or some are the improved version of previous works whereas the others are the combination of conventional methods. This article presents the review of filtenna circuits starting from the beginning to the improvements until date. This article starts with brief overview of various filters with their design strategies and ends in its implementation in filtenna designs followed by discussion on several filtenna designs in term of size and overall performances. Among various designs, bandpass, and bandstop filters are extensively used in filtenna realization as it provides a better selectivity in desired band. Various planar filtenna circuits, based on either defected ground structure (DGS) or resonator or SIW filters are reviewed and presented. Besides, planar filtennas, these filters are also integrated to the aperture of horn antennas for the realization of horn filtennas, applicable for high frequency operations. It is observed that SIW based filtennas exhibited narrow impedance bandwidth. This feature can be improved by doubling substrate layer as well as the number of metallic ways. Whereas, resonator based filtennas use resonator based filters along with DGSs to enhance impedance bandwidth as well as minimize mutual coupling and cross‐polar radiation. Apart from single element filtenna, filtenna arrays, and reconfigurable filtennas (including planar and horn reconfigurable filtennas) are presented. This review article may be helpful for beginners working on filtenna circuits and also such a review process is not available in the open literature to the best of author's knowledge.

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A Reconfigurable Bandpass Filter Based on a Varactor-Perturbed, T-Shaped Dual-Mode Resonator

Cited by 40 publications

References 9 publications

Tune-all microstrip bandpass filter

Tune-all microstrip bandpass filter

Multi-functional and Tunable Microwave Devices and Sub-systems for Wideband Applications

Filtennas for wireless application: A review

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