A Novel Tunable Microstrip Patch Antenna Using Liquid Crystal

Dai, Jihong; Peng, Hong-Li; Zhang, Yao-Ping; Mao, Jun‐Fa

doi:10.2528/pierc16120501

“…Table 2 displays the performance characteristics of the proposed antenna based on LC and the previous antennas. The bandwidths of the antennas are respectively increased by a factor of 2 and 1.5 compared to the LC-based antennas [1,2], while the effective sizes of the antennas are 61.4% and 24.6% of those of the previously proposed antennas. It is worth noting that the previously proposed LC-based antenna [13] does not fully utilize the performance potential of LC, resulting in an inability to operate at 5G millimeter wave.…”

Section: Resultsmentioning

confidence: 99%

“…In conclusion, the recon gurable antenna based on liquid crystal material can not only enable the frequency switching but also keep the radiation characteristics stable during the reconstruction process. Two prior studies used the GT7 LC (Merck KGaA) [1], and K15 LC (Merck) [2]. The electromagnetic properties of these two LCs are, ε r , // = 3.2, ε r,⊥ = 2.55 and ε r,// = 3.1, ε r,⊥ = 2.7.…”

Section: Resultsmentioning

confidence: 99%

“…To satisfy the requirements of miniaturization, broadband, and functional diversi cation of wireless communication system development, frequency recon gurable antenna is becoming more and more popular. A large number of frequency recon gurable antenna have been reported [1][2][3][4][5] , and their reconstruction methods are various. The traditional methods of using PIN diodes and MEMS switches to achieve antenna frequency reconstruction are limited by the inherent size of the switch and the operating frequency band [6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

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Liquid Crystal-Based Reconfigurable Antenna for 5G Millimeter-Wave

Chen,

Wang,

Wang

et al. 2024

Preprint

0

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This paper proposed a frequency reconfigurable antenna that utilizes a multilayer structure of liquid crystal (LC) material. This antenna design incorporates a three-layer stacked structure to create an LC-injected cavity. The inverted microstrip line structure is designed to be in contact with the LC, serving as both a radiating element and a bias electrode. A parasitic patch is placed at the top of the antenna to enhance bandwidth. To prevent interference with DC and RF sources, a bias tee is integrated into the microstrip line input. Experimental results demonstrate that the proposed antenna exhibits excellent impedance matching and stable radiation patterns within the operational frequency range. By comparing the simulated performance of the existing LC antenna with our proposed design, the bandwidth is tripled at a center frequency of 30.3 GHz. In addition, the effective area of the proposed reconfigurable antenna (154 mm2) is 24.6% of the area of the previous reconfigurable antenna (625 mm2).

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Liquid crystal and liquid crystal polymer antennas

Madhav

¹

,

Pisipati

²

2022

Liquid Crystal Polymer Nanocomposites

0

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Liquid crystal-based reconfigurable antenna for 5G millimeter-wave

Chen,

Wang,

Wang

et al. 2024

Sci Rep

0

View full text Add to dashboard Cite

This paper proposed a frequency reconfigurable antenna that utilizes a multilayer structure of liquid crystal (LC) material. This antenna design incorporates a three-layer stacked structure to create an LC-injected cavity. The inverted microstrip line structure is designed to be in contact with the LC, serving as both a radiating element and a bias electrode. A parasitic patch is placed at the top of the antenna to enhance bandwidth. To prevent interference with DC and RF sources, a bias tee is integrated into the microstrip line input. Experimental results demonstrate that the proposed antenna exhibits excellent impedance matching and stable radiation patterns within the operational frequency range. By comparing the simulated performance of the existing LC antenna with our proposed design, the bandwidth is tripled at a center frequency of 30.3 GHz. In addition, the effective area of the proposed reconfigurable antenna (154 mm 2 ) is 24.6% of the area of the previous reconfigurable antenna (625 mm 2 ).Frequency reconfigurable antennas are widely utilized in modern wireless communication systems due to their ability to dynamically alter frequency characteristics and good electromagnetic compatibility. To satisfy the requirements of miniaturization, broadband, and functional diversification of wireless communication system development, frequency reconfigurable antenna is becoming more and more popular. A large number of frequency reconfigurable antenna have been reported [1][2][3][4][5] , and their reconstruction methods are various. The traditional methods of using PIN diodes and MEMS switches to achieve antenna frequency reconstruction are limited by the inherent size of the switch and the operating frequency band [6][7][8][9] . Because the theoretical design of the variable capacitance of the varactor diode is not quite consistent with the actual, and the experimental design is difficult, the application of the varactor diode in the frequency reconfigurable antenna is relatively limited. The use of LC materials to achieve frequency reconfigurability in the millimeter-wave band is more advantageous than the above methods. Despite the many advantages of LC, many studies based on LCs do not provide measurement results 10,11 . The above studies do not discuss the design of an antenna structure that can be applied to 5G millimeter wave 12,13 .To solve some issues discussed above, in this paper a reconfigurable antenna with parasitic elements, electromagnetic band gap structure and LC is presented. The antenna can achieve wide bandwidth and continuous tunable in 5G millimeter wave band. The paper is organized as follows. Some introductions about the research of reconfigurable antenna are introduced in "Introduction" section. "Operating principle and antenna design" section introduces and analyzes the electromagnetic properties and structure of the reconfigurable antenna. The optimized antenna parameters and corresponding measured outcomes are presented in "Experimental results and discussion" section. Finally, "Conclu...

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A Novel Tunable Microstrip Patch Antenna Using Liquid Crystal

Cited by 7 publications

References 18 publications

Liquid Crystal-Based Reconfigurable Antenna for 5G Millimeter-Wave

Liquid Crystal-Based Reconfigurable Antenna for 5G Millimeter-Wave

Liquid crystal and liquid crystal polymer antennas

Liquid crystal-based reconfigurable antenna for 5G millimeter-wave

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