Multi-band reconfigurable microwave filter using dual concentric resonators

Kingsly, Saffrine; Kanagasabai, Malathi; Alsath, M. Gulam Nabi; Subbaraj, Sangeetha; Selvam, Yogeshwari Panneer; Natarajan, Rajesh

doi:10.1002/mmce.21290

Cited by 11 publications

(3 citation statements)

References 24 publications

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“…Tunable tri-band BPF are also presented in [6], but which also has only one tunable passband. In Kingsly et al [7], through the combination of pin diodes, the filter can work in a series of two-band or three-band states, but it can only provide discrete center frequencies and cannot achieve continuous tuning. Compact tri-band filter with three tunable passbands is proposed in [8].…”

Section: Introductionmentioning

confidence: 99%

A novel reconfigurable tri-mode resonator and its application to bandpass filter

2022

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A reconfigurable tri-mode resonator and its application to tri-band bandpass filter have been demonstrated. The proposed filter exhibits 32.8% fractional tuning range of the first passband from 1.12-1.56 GHz and 12.73% of the third pass-band from 2.50-2.84 GHz, and a fixed second passband at 2 GHz, respectively. The first and third frequency passbands can be tuned independently without interfering with each other. Especially, the filter uses a hybrid technique of lumped inductors and microstrip lines, resulting in a very compact mechanical size of 0.12 ?g ? 0.08 ?g, where ?g is the guided wavelength on the substrate at the central of the first passband frequency. The measured results agree well with the simulated ones.

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Section: Introductionmentioning

confidence: 99%

A novel reconfigurable tri-mode resonator and its application to bandpass filter

2022

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“…Reconfigurable and tunable bandpass filters play a vital role in modern wireless communication RF front‐ends, because of their ability to adjust the passband in one circuit according to requirements, using some tunability schemes 1,2 . The varactor diode, with its small size, low cost, and fast tuning, is superior to all other tuning technologies 3‐5 …”

Section: Introductionmentioning

confidence: 99%

Highly‐tunable and wide stopband microstrip bandpass filters

Iqbal

Smida

Waly

et al. 2021

Int J RF Microw Comput Aided Eng

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This paper presents the design of a highly‐tunable single‐ended and balanced filter with improved upper stopband performance. The proposed filters are designed using a spurline and a U‐shaped stepped impedance resonator (SIR) with a varactor diode connected to the open‐circuited end. A spurline is introduced in both designs to achieve wide stopband performance by suppressing the higher‐order modes. The proposed filters have high tunable ranges (single‐ended: 2.35‐3.99 GHz; balanced: 2.39‐4 GHz), low insertion losses (IL) (single‐ended: 0.07‐0.2 dB; balanced: 0.21 to 1.1 dB) and wide upper stopband performance (single‐ended: 3.79f1 with a rejection level higher than 20 dB; balanced: 3.79f1 with a rejection level higher than 20 dB). Performance of both filters are experimentally validated by comparing the experimental results with the simulated ones. Both filters can cover most of the fifth‐generation (5G) wireless communication bands with different biasing voltages (capacitance). When both filters are compared with state‐of‐the‐art filters, the proposed filters are found to achieve high tunable ranges with low IL and wide upper stopband performance.

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“…Varactors [6][7][8][9][10][11] or MEMS capacitors [30] controlled with a common voltage [7,11,29,31] or separate independent voltages [6,8,28,32] are used as the tuning elements. Additionally, a reconfiguration of the filter network can be applied by means of the PIN diodes [33] or MEMS switches [34].…”

Section: Introductionmentioning

confidence: 99%

A Compact Widely Tunable Bandpass Filter Dedicated to Preselectors

et al. 2021

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This article presents a novel compact widely tunable bandpass filter. The filter consists of two resonators that are double-coupled, inductively, where the coupling inductances are elements of the input and output networks. The application of double-coupling enabled the transmission zero next to the upper cutoff frequency. This makes the filter useful for applications in preselector networks used in receiving systems with a low to intermediate frequency with the desired channel frequency lower than the image channel frequency. The article shows the practical realisation of the varactor-tuned example filter fabricated as a microstrip planar network of an overall size of 0.03λg × 0.045λg. The tuning range of the proposed filter is from 410 MHz to 880 MHz with the fractional bandwidth equal to 7.5–8.1% and an in-band insertion loss better than −3.4 dB. The achieved IP3 value exceeds 17.5 dBm.

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Multi-band reconfigurable microwave filter using dual concentric resonators

Cited by 11 publications

References 24 publications

A novel reconfigurable tri-mode resonator and its application to bandpass filter

A novel reconfigurable tri-mode resonator and its application to bandpass filter

Highly‐tunable and wide stopband microstrip bandpass filters

A Compact Widely Tunable Bandpass Filter Dedicated to Preselectors

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