Results 251 to 260 of about 85,450 (309)

A Tunable Bandpass Filter with Switchable Bandwidth

Journal of Electromagnetic Waves and Applications, 2011
A novel bandpass filter with tunable center frequency and switchable bandwidth is presented in this paper. This work is devoted to demonstrate a new approach to tune bandwidth of filters by changing the size of perturbation patch of dual-mode resonator.
B. Liu, F. Wei, H. Zhang, X. Shi, H. Lin
openaire   +1 more source

Ultra-broadband terahertz bandpass filter with dynamically tunable attenuation based on a graphene-metal hybrid metasurface.

Applied Optics, 2021
We propose an ultra-broadband terahertz bandpass filter with dynamically tunable attenuation based on a graphene-metal hybrid metasurface. The metasurface unit cell is composed of two metal stripes enclosed with a graphene rectangular ring.
Wenli Huang, Xiaoqing Luo, Yuanfu Lu, F. Hu, Guangyuan Li   +4 more
semanticscholar   +1 more source

Frequency- and Bandwidth-Tunable Absorptive Bandpass Filter

IEEE Transactions on Microwave Theory and Techniques, 2019
In this paper, an analytic design method for a frequency- and bandwidth-tunable absorptive bandpass filter is introduced. The presented design method relies on the transformation from the normalized absorptive low-pass filter prototype to a bandpass ...
Seong-Wook Jeong, Tae-Hak Lee, Juseop Lee   +2 more
exaly   +2 more sources

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
openaire   +1 more source

A dual‐mode tunable bandpass filter for GSM, UMTS, WiFi, and WiMAX standards applications

International journal of circuit theory and applications, 2019
This paper presents a dual‐mode tunable bandpass filter (BPF) for global system for mobile communication, universal mobile telecommunications system, wireless fidelity, and worldwide interoperability for microwave access standard applications.
Samaneh Sedighi Maragheh, M. Dousti, M. Dolatshahi, B. Ghalamkari   +3 more
semanticscholar   +1 more source

High- $Q$ -Factor Tunable Bandpass Filter With Constant Absolute Bandwidth and Wide Tuning Range Based on Coaxial Resonators

IEEE transactions on microwave theory and techniques, 2019
This paper presents a method for designing low-loss varactor-based tunable bandpass filters (BPFs) with constant absolute bandwidth (CABW) and wide tuning range based on coaxial resonators. The whole structure consists of a metallic cavity and a piece of
Jin-Xu Xu, Lian Yang, Yang Yang, Xiu Yin Zhang   +3 more
semanticscholar   +1 more source

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
openaire   +1 more source

Progress of a tunable active bandpass filter

Annales Des Télécommunications, 1992
A review of a tunable active bandpass filter developed in our research group is given here. Presented first is the basic structure of an end-coupled microstrip-line bandpass filter. Next discussed is the concept of using coupled negative resistance to compensate the loss of tank circuit.
Jenshan Lin, Chi-Yang Chang, Yukio Yamamoto, Tatsuo Itoh   +3 more
openaire   +1 more source

Active varactor tunable bandpass filter

IEEE Microwave and Guided Wave Letters, 1993
A microstrip active varactor tunable bandpass filter is presented. The filter is based upon the negative resistance method using a microstrip combline network. A 1.8-GHz, two-pole device with a bandwidth of 2% was constructed. 0.6 octave tuning with significant improvement in passband performance was achieved compared with its passive counterpart. >
S.R. Chandler, I.C. Hunter, J.G. Gardiner   +2 more
openaire   +1 more source

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
openaire   +1 more source