Frequency switchable microstrip filter for microwave frequencies

Chauraya, Alford; Kelly, James R.; Seager, Rob; Vardaxoglou, J.C.

doi:10.1109/eumc.2005.1608795

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…The applications include microstrip lines based filters and substrates for printed antenna structures. Vardaxoglou et al demonstrated frequency switchable filter [2], optically operated phase shifter and optically controlled microstrip patch antenna. A frequency switchable microstrip filter for microwave applications was realised by modifying a single pole parallel-coupled line filter, and the wave propagation in the filter is controlled by varying the structural parameters.…”

Section: Photoconductive Devicesmentioning

confidence: 99%

“…The advantages of the optically controlled microwave devices include high isolation between the controlling optical beam and the controlled microwave signal, short response time, high-power handling capacity, immunity to electromagnetic interference and low cost. Optically controlled antennas [1], filters [2], resonators [3], phase-shifters [4], have been demonstrated recently.…”

Section: Introductionmentioning

confidence: 99%

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Frequency reconfigurable RF circuits using photoconducting switches

Draskovic

Panagamuwa

Vardaxoglou

et al. 2009

Int J RF and Microwave Comp Aid Eng

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Section: Photoconductive Devicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Frequency reconfigurable RF circuits using photoconducting switches

Draskovic

Panagamuwa

Vardaxoglou

et al. 2009

Int J RF and Microwave Comp Aid Eng

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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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