A Novel Microwave Tunable Band-Pass Filter Integrated Power Divider Based on Liquid Crystal

This paper proposes a novel microwave continuous adjustable band-pass filter integrated power divider based on nematic liquid crystals (LCs). The proposed power divider uses liquid crystal (LC) as the dielectric material. It can realize phase shift by changing the dielectric anisotropy, when biasing the high anisotropy nematic liquid crystal. It is mainly used in microwave frequencies. It has a large number of advantages compared to conventional filter integrated power divider, such as low loss, multifunction integration, continuous adjustable, miniaturization, low processing costs, low operating voltage, high phase shift, and convenient manufacture. Therefore, it has shown great potential for application.

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A Microwave Tunable Bandpass Filter for Liquid Crystal Applications

Frequenz ◽

10.1515/freq-2016-0068 ◽

2017 ◽

Vol 71 (7-8) ◽

Cited By ~ 1

Author(s):

Weiping Cao ◽

Di Jiang ◽

Yupeng Liu ◽

Yuanwang Yang ◽

Baichuan Gan

Keyword(s):

Liquid Crystal ◽

Bandpass Filter ◽

Tunable Filter ◽

Dielectric Anisotropy ◽

Band Pass Filter ◽

Microwave Band ◽

Pass Filter ◽

Practical Applications ◽

Electro Optic ◽

Band Pass

AbstractIn this paper, a novel microwave continuously tunable band-pass filter, based on nematic liquid crystals (LCs), is proposed. It uses liquid crystal (LC) as the electro-optic material to mainly realize frequency shift at microwave band by changing the dielectric anisotropy, when applying the bias voltage. According to simulation results, it achieves 840 MHz offset. Comparing to the existing tunable filter, it has many advantages, such as continuously tunable, miniaturization, low processing costs, low tuning voltage, etc. Thus, it has shown great potentials in frequency domain and practical applications in modern communication.

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Liquid crystal dual-mode band-pass filter with improved performance

Opto-Electronics Review ◽

10.1515/oere-2015-0020 ◽

2015 ◽

Vol 23 (2) ◽

Cited By ~ 1

Author(s):

J. Torrecilla ◽

C. Marcos ◽

V. Urruchi ◽

J.M. Sánchez-Pena ◽

O. Chojnowska

Keyword(s):

Liquid Crystal ◽

Liquid Crystals ◽

Return Loss ◽

Simulation Software ◽

Dielectric Anisotropy ◽

Band Pass Filter ◽

Dual Mode ◽

Pass Filter ◽

Filter Performance ◽

Band Pass

AbstractOver the last twenty years, there has been a growing interest in the design of tunable devices at microwave frequencies by us- ing liquid crystals technology. In particular, the use of liquid crystals with high dielectric anisotropy allows manufacturing voltage-controlled devices to operate in a wide frequency range. In this work the frequency response of a liquid crystal band-pass filter with dual-mode microstrip structure has been studied in depth by using a simulation software tool. A reshap- ing of a conventional dual-mode square patch resonator bandpass filter with a square notch, studied in the literature, has been proposed with the goal of improving the filter performance. The main features achieved are a significant increase in the return loss of the filter and a narrowing of a 3-dB bandwidth. Specifically, a reduction in the filter bandwidth from 800 MHz to 600 MHz, which leads to a return loss increase from 6 dB to 12.5 dB, has been achieved. The filter centre frequency can be tuned from 4.54 GHz to 5.19 GHz.

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Electrically controlled terahertz band pass filter with liquid crystal

10.1117/12.821500 ◽

2008 ◽

Author(s):

Hui Li ◽

Xinyu Zhang ◽

Tianxu Zhang ◽

Xubang Shen

Keyword(s):

Liquid Crystal ◽

Band Pass Filter ◽

Pass Filter ◽

Terahertz Band ◽

Band Pass

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A Band-Pass Filter Based on Half-Mode Substrate Integrated Waveguide and Spoof Surface Plasmon Polaritons

Scientific Reports ◽

10.1038/s41598-019-50056-9 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 2

Author(s):

Lei Zhao ◽

Yuan Li ◽

Zhao-Min Chen ◽

Xin-Hua Liang ◽

Jun Wang ◽

...

Keyword(s):

Surface Plasmon ◽

Surface Plasmon Polaritons ◽

Band Pass Filter ◽

Substrate Integrated Waveguide ◽

Pass Filter ◽

Microwave Frequencies ◽

Potential Applications ◽

Band Pass ◽

Plasmon Polaritons ◽

Spoof Surface Plasmon Polaritons

Abstract In this paper, a band-pass filter based on half-mode substrate integrated waveguide (HMSIW) and double-layer spoof surface plasmon polaritons (SSPPs) consisting of two corrugated metal strips is proposed, which can realize band-pass transmission by etching periodic grooves at the top and bottom metal layers of the HMSIW. Moreover, the influences of important parameters on the performance of the proposed band-pass filter are analyzed by parametric study. By changing the key parameters, the low and high cut-off frequency can be controlled independently. The corresponding equivalent circuit of the proposed band-pass filter is put forward to explain the physical mechanism. Compared with the previous structures, this structure features smaller size, wider bandwidth and lower loss. Simulated results show that the proposed band-pass filter achieves a bandwidth (for |S11| < −10 dB and |S21| > −0.8 dB) of about 69.77% (15.6–32.1 GHz). The measured results have good agreements with the simulated ones, which verify that the proposed band-pass filter has good performances and potential applications at the microwave frequencies.

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