Results 181 to 190 of about 19,862 (222)

ELECTRONICALLY TUNABLE MICROWAVE BANDPASS FILTER

1967
Abstract : An equivalent circuit of two orthogonal striplines coupled by a ferrite (yttrium iron garnet) sphere is derived, using the scattering matrix method. This derivation shows that a nonreciprocal phase shifter can be represented by gyrator networks. Based on this analysis, a YIG bandpass filter, electronically tunable over a very broad frequency
Frank Reggia, Ting Hei Mak
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Tunable and programmable optical bandpass filter

Journal of Optics A: Pure and Applied Optics, 2007
We demonstrate a novel tunable and programmable optical bandpass filter with a transmission peak less than 5 pm wide that is tunable over 18.5 nm. The number of transmission windows within the stop band, as well as each window's position and strength, is set by applying a heat profile to a chirped fibre Bragg grating with the aid of a thermal printer ...
I Petermann, S Helmfrid, O Gunnarsson, L Kjellberg   +3 more
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A Tunable Microwave Bandpass Filter

2019
A convenient prototype of a reconfigurable microwave filter is presented in this paper. The transmission on defined frequencies are achieved by tunable combined lines. The measured performance of a narrow-band reconfigurable band-pass filter is realized using diodes, capacitors, and a voltage sweep of DC feed.
Mohamed Al Khatib, Alaa Saleh, Mohamad Chakaroun, Mohamed Shehade   +3 more
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Wideband bandpass filter with tunable passband

2015 Asia-Pacific Microwave Conference (APMC), 2015
In this paper, a tunable wideband bandpass filter based on stub-loaded stepped-impedance ring resonator is proposed. By changing the characteristic impedances of the loaded stubs, the bandwidth of the passband can be controlled with the center frequency unchanged. The even-and odd-mode method is applied to obtain the expression of S11 and S21.
Cong Tang, Xianqi Lin, Yong Fan, Kaijun Song   +3 more
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Tunable microwave fiber-optic bandpass filters

IEEE Photonics Technology Letters, 1999
A new photonic filter which can realize both high-resolution bandpass microwave response and which is also widely tunable is presented. This is based on the use of long chirped Bragg gratings and a section of active fiber, and tuning is obtained by changing the carrier wavelength.
D.B. Hunter, R.A. Minasian
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A spurious-free tunable bandpass filter

2008 Asia-Pacific Microwave Conference, 2008
This paper presents a simple structure for suppressing the second-harmonic of tunable filters. The proposed resonator for the filter possesses the advantage that its resonant frequencies of odd-mode can be electrically tuned, whereas the even-mode harmonics can be suppressed. In addition, it is very simple and compact in structure.
null Xiu Yin Zhang, null Jian-Xin Chen, null Jin Shi, null Quan Xue   +3 more
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Micromachined micropackaged filter banks and tunable bandpass filters

Proceedings of 1997 Wireless Communications Conference, 2002
Low cost alternatives to conventional switched filter banks and tunable bandpass filters are investigated. Both types of filters in conventional form suffer from high cost, intricate packaging, and large weight and size. Micromachining and micropackaging were used to allow for a high performance, monolithic design on a single low cost substrate with ...
A.R. Brown, G.M. Rebeiz
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Tunable Bandpass Filter Using a Switched Tunable Diplexer Technique

IEEE Transactions on Industrial Electronics, 2017
In this paper, a new technique using two p-i-n diodes to switch between two channels of a tunable diplexer with constant return loss is proposed to design a tunable bandpass filter (BPF) with wide frequency tuning range (FTR). The used third-order tunable diplexer with two independently tuned channels consists of one common varactor-tuned lumped ...
Jin Xu, Yan Zhu
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Hairpin Tunable Bandpass Filter with Improved Selectivity and Tunability

2007 Asia-Pacific Microwave Conference, 2007
In this paper, a hairpin tunable bandpass filter which has enhanced selectivity and tunability is proposed. The varactors loaded open stubs between quarter-wavelength resonators are introduced to exhibit transmission zeros near the passband and thus better selectivity in the tuning range.
Seung-Un Choi, Moon-Seok Chung, Sang-Won Yun   +2 more
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Tunable bandpass filters with constant absolute bandwidth

Proceedings of the 9th International Symposium on Antennas, Propagation and EM Theory, 2010
This paper presents the design of novel tunable bandpass filters with constant absolute bandwidth. A novel mixed electric and magnetic coupling scheme is utilized. Theoretical analysis indicates that it is able to achieve desired coupling coefficients between the proposed resonators at various frequencies so as to obtain constant absolute bandwidth ...
null Hong-Lin Zhang, Xiu Yin Zhang, null Bin-Jie Hu   +2 more
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