Triple mode spiral wideband bandpass filter using symmetric dual‐line coupling

Lalbakhsh, Ali; Karimi, Gholamreza; Sabaghi, Fatemeh

doi:10.1049/el.2016.4447

Cited by 25 publications

(15 citation statements)

References 7 publications

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“…Among them, the third‐order tunable filters are one of the popular ones. The third‐order BPFs have been published in several research papers 5,6 . A triple mode BPF using symmetric dual‐line coupling has been proposed to achieve wideband BPF 5 .…”

Section: Introductionmentioning

confidence: 99%

Third‐order tunable filter with CFBW using two quarter‐wavelength resonators

Narayana

Singh

2021

Micro & Optical Tech Letters

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A tunable third‐order bandpass filter (BPF) with constant fractional bandwidth (CFBW) is presented. Only two quarter‐wavelength resonators have been used in comb‐line fashion to design the third‐order BPF. The physical dimensions of the resonators have been decided to satisfy the filter specifications by synthesizing the coupling matrix. Using modal voltage waveform analysis, locations of the varactors to be connected are identified to tune the first three modes of the resonators to form the BPF. The varactors connected symmetrically between the two quarter‐wavelength resonators can only control the odd modes, while the varactors loaded at the resonator ends can control the odd and even modes simultaneously. Moreover, the capacitance ranges of the varactors have been chosen to achieve the desired tuning of the filter. The center frequency of the filter is tunable from 640 to 840 MHz with CFBW of approximately 32%.

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Section: Introductionmentioning

confidence: 99%

Third‐order tunable filter with CFBW using two quarter‐wavelength resonators

Narayana

Singh

2021

Micro & Optical Tech Letters

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“…Microstrip technology has been widely used in modern communication systems since it is a mature and highly reliable technology for microwave-and millimeter-wave applications [1][2][3][4][5][6][7][8][9][10][11]. In particular, multiband bandpass filters (BPFs) have been utilized in wireless communication transceivers to separate frequency spectrum in different bands.…”

Section: Introductionmentioning

confidence: 99%

A Compact C-Band Bandpass Filter with an Adjustable Dual-Band Suitable for Satellite Communication Systems

et al. 2020

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A narrowband dual-band bandpass filter (BPF) with independently tunable passbands is presented through a systematic design approach. A size-efficient coupling system is proposed with the capability of being integrated with additional resonators without increasing the size of the circuit. Two flag-shaped resonators along with two stepped-impedance resonators are integrated with the coupling system to firstly enhance the quality response of the filter, and secondly to add an independent adjustability feature to the filter. The dual passband of the filter is centered at 4.42 GHz and 7.2 GHz, respectively, with narrow passbands of 2.12% and 1.15%. The lower and upper passbands can be swept independently over 600 MHz and 1000 MHz by changing only one parameter of the filter without any destructive effects on the frequency response. According to United States frequency allocations, the first passband is convenient for mobile communications and the second passband can be used for satellite communications. The filter has very good in- and out-of-band performance with very small passband insertion losses of 0.5 dB and 0.86 dB as well as a relatively strong stopband attenuation of 30 dB and 25 dB, respectively, for the case of lower and upper bands. To verify the proposed approach, a prototype of the filter is fabricated and measured showing a good agreement between numerically calculated and measured results.

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“…In recent years, the demand for compact microstrip filters is growing due to the newly expanding microwave and mobile communication systems [1][2][3][4]. In order to reduce the complexity and overall volume of such systems, compact and flexible structures like reconfigurable filters are used [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Design and Development of Compact Reconfigurable Tri-Stopband Bandstop Filter Using Hexagonal Metamaterial Cells for Wireless Applications

Fertas¹,

Ghanem²,

Challal³

et al. 2019

PIER M

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In this paper, a compact reconfigurable tri-band bandstop filter (BSF) with sharp-rejection and high selectivity is presented. The proposed filter is based on a 50 Ohms microstrip feed line, six hexagonal metamaterial cells (HMCs) with different sizes and switches. The structure of the filter has seven different modes of operation characterized. A good agreement between the simulated and measured results is obtained. The results indicate that the proposed filter design, with overall size of 0.28λg × 0.17λg, is a good candidate for multiservice radios applications.

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Triple mode spiral wideband bandpass filter using symmetric dual‐line coupling

Cited by 25 publications

References 7 publications

Third‐order tunable filter with CFBW using two quarter‐wavelength resonators

Third‐order tunable filter with CFBW using two quarter‐wavelength resonators

A Compact C-Band Bandpass Filter with an Adjustable Dual-Band Suitable for Satellite Communication Systems

Design and Development of Compact Reconfigurable Tri-Stopband Bandstop Filter Using Hexagonal Metamaterial Cells for Wireless Applications

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