scholarly journals A MINIATURIZED TUNABLE BANDPASS FILTER WITH CONSTANT FRACTIONAL BANDWIDTH

2015 ◽  
Vol 57 ◽  
pp. 89-97
Author(s):  
Liangzu Cao ◽  
Guangwen Li ◽  
Jian Hu ◽  
Lixia Yin
Keyword(s):  
Bandpass Filter ◽  
Fractional Bandwidth ◽  
Tunable Bandpass Filter

scholarly journals A Compact Widely Tunable Bandpass Filter Dedicated to Preselectors

Electronics ◽  
2021 ◽  
Vol 10 (18) ◽  
pp. 2315
Author(s):  
Mirosław Magnuski ◽  
Dariusz Wójcik ◽  
Maciej Surma ◽  
Artur Noga
Keyword(s):  
Tuning Range ◽  
Bandpass Filter ◽  
Cutoff Frequency ◽  
Intermediate Frequency ◽  
Fractional Bandwidth ◽  
Planar Network ◽  
Image Channel ◽  
Double Coupling ◽  
Better Than ◽  
Tunable Bandpass Filter

This article presents a novel compact widely tunable bandpass filter. The filter consists of two resonators that are double-coupled, inductively, where the coupling inductances are elements of the input and output networks. The application of double-coupling enabled the transmission zero next to the upper cutoff frequency. This makes the filter useful for applications in preselector networks used in receiving systems with a low to intermediate frequency with the desired channel frequency lower than the image channel frequency. The article shows the practical realisation of the varactor-tuned example filter fabricated as a microstrip planar network of an overall size of 0.03λg × 0.045λg. The tuning range of the proposed filter is from 410 MHz to 880 MHz with the fractional bandwidth equal to 7.5–8.1% and an in-band insertion loss better than −3.4 dB. The achieved IP3 value exceeds 17.5 dBm.

Three-Pole Tunable Bandpass Filters With Constant Fractional Bandwidth Using Mixed Comb-line Resonators

Frequenz ◽  
2014 ◽  
Vol 68 (9-10) ◽  
Author(s):  
Zhiyuan Zhao ◽  
Jiang Chen ◽  
Lin Yang ◽  
Kunhe Chen
Keyword(s):  
Frequency Band ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Center Frequency ◽  
Fractional Bandwidth ◽  
Tunable Bandpass Filter

AbstractA novel three-pole tunable bandpass filter using mixed combline resonators with a center frequency band of 0.9–1.8 GHz is proposed in this paper. The varactor-tuned filter is designed on a Rogers substrate with

Tunable Bandpass Filter With Independently Controllable Dual Passbands

2013 ◽  
Vol 61 (9) ◽  
pp. 3200-3208 ◽  
Author(s):  
Xiaoguo Huang ◽  
Lei Zhu ◽  
Quanyuan Feng ◽  
Qianyin Xiang ◽  
Dinghong Jia
Keyword(s):  
Bandpass Filter ◽  
Tunable Bandpass Filter

Fiber laser refractometer based on tunable bandpass filter tailored FBG reflection

2018 ◽  
Vol 99 ◽  
pp. 101-106 ◽  
Author(s):  
Junfa Zhao ◽  
Juan Wang ◽  
Cheng Zhang ◽  
Wei Xu ◽  
Xiaodong Sun ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Bandpass Filter ◽  
Laser Refractometer ◽  
Tunable Bandpass Filter

A Tunable Bandpass Filter with bandwidth or transmission zeros control

2021 ◽  
Author(s):  
Liangzu Cao ◽  
Zijing Li ◽  
Di Deng ◽  
Junmei Yan ◽  
Lixia Yin
Keyword(s):  
Bandpass Filter ◽  
Transmission Zeros ◽  
Tunable Bandpass Filter
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