Tunable Filters With Nonuniform Microstrip Coupled Lines

Koochakzadeh, Masoud; Abbaspour-Tamijani, A.

doi:10.1109/lmwc.2008.922115

Cited by 21 publications

(3 citation statements)

References 5 publications

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“…On the other hand, low-cost components such as varactors [13,14] and PIN [15,16] diodes are used in tunable microwave structures. One or more varactors can be integrated to modify the central frequency of the resonators and PIN diodes are frequently used to provide the switching function (ON/OFF states).…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Microfluidically Tunable Microwave Filters

Habbachi

Besbes

2022

Electronics

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This paper presents a contribution to evaluating the performances of tunable devices devoted to RF applications. It is based on reconfiguration by fluids of a capacitor/inductor associated in a monolithic substrate. Indeed, the association of two microfluidic passive devices on the same wafer allows us to increase the total frequency response of microwaves structures. The study evokes the presence and displacement of different conductive and dielectric liquids in the structure microchannels. The theoretical analysis concerns the association of microfluidic devices, a capacitor and inductor, in parallel topology. The obtained results show a good agreement between electrical parameters and the microwave response. Furthermore, a significant frequency variation from 370 MHz to 1720 MHz is achieved, with a tuning range that reaches 364.8%. The experimental part exhibits the fabrication and characterization of two structures in order to evaluate the response of microfluidic actuation for two architectures: a pass-band filter (presented in prior work) and a stop-band filter. The obtained results are in good agreement with the modeled behavior and demonstrate a large tuning range for the stop-band filter.

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Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Microfluidically Tunable Microwave Filters

Habbachi

Besbes

2022

Electronics

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“…Thus, tunable bandpass filters constitute an interesting solution to this problem since they can perform over all operating bands. For planar filters, the frequency tunability can be achieved by using various technologies like MEMS [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], ferromagnetic [16], ferroelectric [17][18][19], optical [20], piezoelectric [21,22], mechanical [23], or semiconductor [23][24][25][26][27][28][29][30][31][32] tuning elements.…”

Section: Introductionmentioning

confidence: 99%

Novel factor of merit for center‐frequency tunable bandpass filters comparison

Pistono

Kaddour

Duvillaret

et al. 2009

Micro & Optical Tech Letters

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fifth harmonic signal is also suppressed and suppressed level at the fifth harmonic of 10 GHz is 30 dB. The measurements show similar fundamental responses while the proposed hybrid achieves a suppression improvement of 22 dB at the third harmonic frequency and 27 dB at the fifth harmonic frequency. The sizes of the conventional and second proposed hybrids are commeasurable. The phase difference between Port 2 and Port 3 is 88.8°at fundamental frequency. CONCLUSIONSTwo improved quadrature hybrids with the harmonic suppression are proposed. In comparison to the conventional quadrature hybrid, the proposed quadrature hybrid with the third harmonic suppression achieves not only a 29.5% size reduction but also a 18-dB suppression at the third harmonic frequency, and the other proposed quadrature hybrid achieves a 23-dB suppression at the third harmonic frequency and a 30-dB suppression at the fifth harmonic frequency. The proposed hybrids do not need lumped elements or via-hole grounding, which leads to low cost, simple fabrication process, and excellent design accuracy. ACKNOWLEDGMENTS

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“…Throughout the current decade, tunable bandpass filters (BPFs) have been an attractive research topic because they can be favourably utilised in multiband wireless systems. For frequency tuning, varactor and pin diodes have been employed in filter designs [1][2][3]. These designs use solid-state components and require other circuit elements such as RF coupling capacitors, RF chokes, DC block capacitors and DC bias lines.…”

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confidence: 99%

Piezoelectric transducer-controlled tunable hairpin bandpass filter

2012

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A piezoelectric transducer (PET)-controlled tunable hairpin bandpass filter (BPF) is introduced. A dielectric perturber is attached to a PET cantilever beam and suspended above the hairpin BPF. The PET actuator vertically lifts up or pulls down the attached dielectric perturber using a DC bias voltage. The dielectric perturber changes the effective permittivity, causing a variation in the BPF's effective capacitance. This changes the centre frequency and passband of the BPF. The hairpin BPF is designed at 5.8 GHz with a fractional bandwidth (FBW) of 0.414%. The fabricated BPF shows a measured insertion loss of less than 2.5 dB and a return loss of greater than 12 dB in the frequency tuning range.

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Tunable Filters With Nonuniform Microstrip Coupled Lines

Cited by 21 publications

References 5 publications

Performance Evaluation of Microfluidically Tunable Microwave Filters

Performance Evaluation of Microfluidically Tunable Microwave Filters

Novel factor of merit for center‐frequency tunable bandpass filters comparison

Piezoelectric transducer-controlled tunable hairpin bandpass filter

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