Backlobe and Sidelobe Suppression of a Q-Band Patch Antenna Array by Using Substrate Integrated Coaxial Line Feeding Technique

Xing, Ke Jia; Liu, Bing; Guo, Zi-Jun; Wei, Xiangyun; Zhao, Renrong; Ma, Yu

doi:10.1109/lawp.2017.2759909

Cited by 35 publications

(15 citation statements)

References 12 publications

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“…CPWs may be desired for the integration of MMICs, whose mode profile is the same as the ground-signal-ground (G-S-G) pads of MMICs. Recently, a novel substrate-integrated coaxial line (SICL) was reported for antenna array feeding on multilayer LCP substrates [38]. Based on various transmission lines, functional circuit devices, such as filters, duplexers, baluns, and power dividers, have been proposed, and their flexible applications have been investigated.…”

Section: Flexible Lcp Circuitsmentioning

confidence: 99%

Flexible Liquid Crystal Polymer Technologies from Microwave to Terahertz Frequencies

Zhou

Qian

et al. 2022

Molecules

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With the emergence of fifth-generation (5G) cellular networks, millimeter-wave (mmW) and terahertz (THz) frequencies have attracted ever-growing interest for advanced wireless applications. The traditional printed circuit board materials have become uncompetitive at such high frequencies due to their high dielectric loss and large water absorption rates. As a promising high-frequency alternative, liquid crystal polymers (LCPs) have been widely investigated for use in circuit devices, chip integration, and module packaging over the last decade due to their low loss tangent up to 1.8 THz and good hermeticity. The previous review articles have summarized the chemical properties of LCP films, flexible LCP antennas, and LCP-based antenna-in-package and system-in-package technologies for 5G applications, although these articles did not discuss synthetic LCP technologies. In addition to wireless applications, the attractive mechanical, chemical, and thermal properties of LCP films enable interesting applications in micro-electro-mechanical systems (MEMS), biomedical electronics, and microfluidics, which have not been summarized to date. Here, a comprehensive review of flexible LCP technologies covering electric circuits, antennas, integration and packaging technologies, front-end modules, MEMS, biomedical devices, and microfluidics from microwave to THz frequencies is presented for the first time, which gives a broad introduction for those outside or just entering the field and provides perspective and breadth for those who are well established in the field.

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Section: Flexible Lcp Circuitsmentioning

confidence: 99%

Flexible Liquid Crystal Polymer Technologies from Microwave to Terahertz Frequencies

Zhou

Qian

et al. 2022

Molecules

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“…Tsunoda et al [19] proposed a thinning method for suppressing the sidelobe of planar antenna arrays, which is a multistage decision procedure. Xing et al [20] used the substrate integrated coaxial line feeding technique to reduce both the backlobe level and the SLL of a Q-band patch antenna array simultaneously. The use of conventional methods to optimize an antenna array is complex because there are complicated boundary conditions and interactions of parameters.…”

Section: Related Workmentioning

confidence: 99%

IWORMLF: Improved Invasive Weed Optimization With Random Mutation and Lévy Flight for Beam Pattern Optimizations of Linear and Circular Antenna Arrays

et al. 2020

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The beam pattern synthesis of antenna arrays is one of the most significant optimization problems in the electromagnetics community, and it affects the performance of wireless communication systems. In this article, we formulate the beam pattern optimization problems, and propose an improved invasive weed optimization with random mutation and Lévy flight (IWORMLF) algorithm to synthesize the beam patterns of linear antenna arrays (LAAs) and circular antenna arrays (CAAs). IWORMLF introduces the random mutation operator and the Lévy flight mechanism to enhance the efficiency and to balance the exploration and exploitation of the algorithm for optimization problems. Several simulations are conducted to evaluate the performance of the proposed approach. First, IWORMLF is tested by a variety of benchmark functions, and the results indicate that it achieves the best performance in most of the functions compared to some other algorithms. Second, IWORMLF is utilized for the maximum sidelobe level (SLL) reduction and the joint maximum SLL and mainlobe beamwidth reductions. The results show that it achieves better performances in terms of the convergence rate, stability, and accuracy compared to some evolutionary algorithms for these optimization cases. Third, the efficiencies of the improved factors are verified. Finally, electromagnetism simulations are conducted to evaluate the performance of IWORMLF for the beam pattern optimizations with considering mutual coupling.INDEX TERMS Antenna array, beam pattern, sidelobe level, invasive weed optimization.

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“…Recently, SICL has obtained more attention in the microwave technical field. At present, the SICL can be used to design the antenna [9][10][11][12][13][14], balun [15], and transition between SICL [16,17] and filter [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A Dual-Polarized Printed Antenna Based on a Tapered Slot SICL Balun for Airborne Radar Application

Liu

Wang

Zhang

et al. 2020

International Journal of Antennas and Propagation

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The substrate-integrated coaxial line (SICL) is a potential transmission line due to its good characteristics of high efficiency, nondispersive, and single operational mode. A tapered slot SICL balun is proposed, which can realize the impedance transformation from the microstrip line to the coplanar strip line (CPS). At the same time, the proposed balun can transform the quasi-TEM mode of the microstrip line to the TEM mode of CPS. A printed dipole radiator is designed and is fed by the proposed SICL balun to achieve the impedance matching. The dual-polarized radiation mode is realized by employing two orthogonal printed dipoles. For each polarization radiator, the CPS is bended to avoided the occlusion of two polarization ports and realize the direct assembling of two orthogonal printed circuits. What is more, the assembling method is advantageous to improve the port isolation degree and decrease the cross polarization level. To improve the ratio of front to back (F/B) of the radiation pattern, a cylindrical metal cavity is adopted. According to the results of simulation and experiments, the VSWR of each port is lower than 2, the isolation degree between two polarization ports is higher than 20 dB, and the cross polarization level at the boresight is lower than −20 dB at the operational frequency. The patterns of two ports are almost symmetric, and high radiation efficiency is obtained. The experimental results of the principle prototype verify the design schemes of the balun and the dual-polarized antenna. The proposed dual-polarized antenna fed by the tapered slot SICL balun is suitable for the airborne radar application.

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Backlobe and Sidelobe Suppression of a Q-Band Patch Antenna Array by Using Substrate Integrated Coaxial Line Feeding Technique

Cited by 35 publications

References 12 publications

Flexible Liquid Crystal Polymer Technologies from Microwave to Terahertz Frequencies

Flexible Liquid Crystal Polymer Technologies from Microwave to Terahertz Frequencies

IWORMLF: Improved Invasive Weed Optimization With Random Mutation and Lévy Flight for Beam Pattern Optimizations of Linear and Circular Antenna Arrays

A Dual-Polarized Printed Antenna Based on a Tapered Slot SICL Balun for Airborne Radar Application

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