A compact novel microwave liquid crystal tunable band-pass filter

Optik ◽  
2016 ◽  
Vol 127 (20) ◽  
pp. 8374-8378 ◽  
Author(s):  
Di Jiang ◽  
Yupeng Liu ◽  
Weiping Cao ◽  
Zhiyong Guo
Keyword(s):  
Liquid Crystal ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Band Pass

Electrically controlled terahertz band pass filter with liquid crystal

2008 ◽  
Author(s):  
Hui Li ◽  
Xinyu Zhang ◽  
Tianxu Zhang ◽  
Xubang Shen
Keyword(s):  
Liquid Crystal ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Terahertz Band ◽  
Band Pass

A Microwave Tunable Bandpass Filter for Liquid Crystal Applications

Frequenz ◽  
2017 ◽  
Vol 71 (7-8) ◽  
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.

scholarly journals Millimeter-Wave Broadband Tunable Band-Pass Filter Based on Liquid Crystal Materials

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 1339-1346
Author(s):  
Di Jiang ◽  
Xiaoyu Li ◽  
Zihao Fu ◽  
Guofu Wang ◽  
Zhi Zheng ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Band Pass ◽  
Liquid Crystal Materials

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

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Yupeng Liu ◽  
Di Jiang ◽  
Lei Xia ◽  
Ruimin Xu
Keyword(s):  
Liquid Crystal ◽  
Phase Shift ◽  
Dielectric Material ◽  
Power Divider ◽  
Dielectric Anisotropy ◽  
Operating Voltage ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Microwave Frequencies ◽  
Band Pass

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.

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

2015 ◽  
Vol 23 (2) ◽  
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.

scholarly journals Bending Limit Tests for Ultra-Thin Liquid Crystal Polymer Substrate Based on Flexible Microwave Components

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 531
Author(s):  
Yu Lan ◽  
Yuehang Xu
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Polymer ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Crystal Polymer ◽  
Limit Test ◽  
Microwave Components ◽  
Conventional Photolithography ◽  
Band Pass ◽  
Microstrip Components

In this paper, bending limit tests for one ultra-thin liquid crystal polymer (LCP) substrate (Rogers 3850) based on the mechanical properties of flexible microwave microstrip components are presented. First, a set of 50 Ω microstrip lines, a band-pass filter, and a stepped impedance filter in X-band, are designed by using double clapped LCPs with 50 μm thickness of substrate and 18 μm thickness of copper, which is fabricated by conventional photolithography. Then, the limit tests of the flexibility of the LCP microwave microstrip components are presented, and the range of the bending limit radius, from 1 mm to 0.75 mm, is demonstrated from the testing results. It is found that the cause for component failure is fracture of the copper (18 μm thickness) laminate, according to the bending limit test experiments. Finally, the analysis of the reasons for the collapse of the microwave components, under bending situations, is explored. The results from this work would be useful for further designs of the flexible microwave devices and systems on LCP substrates, with compact sizes and good performance.

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