Theoretical and experimental investigation of novel varactor-tuned switchable microstrip ring resonator circuits

Martin, T.S.; Wang, F.; Chang, Kai

doi:10.1109/22.17407

Cited by 37 publications

(12 citation statements)

References 12 publications

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“…Three different coupling techniques are studied in order to determine the most suitable technique for use with the simple ring resonator. The three different techniques are: a) Loose-coupling, b) Enhanced-coupling and c) Matched-stub-coupling [6].…”

Section: Coupling Methodsmentioning

confidence: 99%

Analysis of different types of coupling for microstrip ring resonator

Preetha

Jayanthy²

2014

2014 International Conference on Science Engineering and Management Research (ICSEMR)

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Microstrip ring resonators are frequently employed RF/Microwave circuits. Resonator structures such as rectangular, circular and ring resonators have been widely studied in filters and oscillators as well as for dielectric material characterisation. This paper deals with the design and study of coupling efficiency between the microstrip feed lines and the annular microstrip ring elements. Simulation models are developed for different ring resonator coupling techniques: Loose-coupling, Enhanced-coupling and Matched-stub-coupling technique. Finally, a comparison among the developed simulation models is performed in order to evaluate each technique and conclusions are extracted.

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Section: Coupling Methodsmentioning

confidence: 99%

Analysis of different types of coupling for microstrip ring resonator

Preetha

Jayanthy²

2014

2014 International Conference on Science Engineering and Management Research (ICSEMR)

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“…In other words, the proposed switchable filters can have both the advantages of a high-performance switch and a bandpass filter with good stopband rejection. It is observed that the previously published switchable filters could not provide a good stopband rejection as a bandpass filter at the on state and wideband isolation at the off state [14]- [16]. Compare with the bandpass filters with the same order and 3-dB bandwidth [12]: the passband insertion losses increased is about 1 dB, while it can trade for high and wideband isolations in the off state.…”

Section: Compact Spdt Switchable Filter With Common Resonatorsmentioning

confidence: 99%

Electronically Switchable Bandpass Filters Using Loaded Stepped-Impedance Resonators

Chao

Tsai

et al. 2006

IEEE Trans. Microwave Theory Techn.

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Stepped-impedance resonators with diodes loaded at one end are used to develop switchable bandpass filters in this paper. The loaded diodes are used to switch the resonance conditions of the stepped-impedance resonators. The equations for resonance conditions of the stepped-impedance resonators with different loads at one end are derived and discussed. With these derived equations, the switchable filters can be easily designed and synthesized using the coupled-resonator filter theory. When the switchable filter is switched on, a bandpass filter response with a wide stopband rejection is achieved by making the on-state coupled resonators have the same fundamental resonant frequency, but different higher order resonant frequencies. When switched off, a high and wideband isolation is obtained by properly misaligning the resonant modes of the off-state resonators. The design concept is demonstrated by two single-pole-single-throw fourth-order Butterworth-type switchable microstrip bandpass filters, which utilize two and three switched stepped-impedance resonators, respectively. Finally, a compact single-pole-double-throw switchable microstrip bandpass filter using common resonators is demonstrated for wireless communication applications.Index Terms-Coupled-resonator bandpass filter, steppedimpedance resonator, switch, switchable filter.

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“…The bandwidth of the second-order filter is controlled by tight coupling characteristics between two rings shown in Fig. 8 [ [24][25][26][27][28][29][30][31][32]. From the input admittance of resonator, the parallel and series resonant frequency can easily be derived.…”

Section: Design Of Passive Tunable Bandpass Filtersmentioning

confidence: 99%

Microwave Planar Varactor Tuned Bandpass Filters: Historical Overview

Lee¹,

Yun²

2006

IEICE Transactions on Electronics

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This paper overviews the history of a class of varactor tuned bandpass filters. Since the miniaturization as well as the high performance of the tunable bandpass filters is required for the next generation mobile communication systems, the discussion is focused on the various planar type tunable filters including active configurations. Brief design concepts of various tunable filter configurations as well as their characteristics are discussed.

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Theoretical and experimental investigation of novel varactor-tuned switchable microstrip ring resonator circuits

Cited by 37 publications

References 12 publications

Analysis of different types of coupling for microstrip ring resonator

Analysis of different types of coupling for microstrip ring resonator

Electronically Switchable Bandpass Filters Using Loaded Stepped-Impedance Resonators

Microwave Planar Varactor Tuned Bandpass Filters: Historical Overview

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