Article
Computer Science, Information Systems
Bin Xi, Yu Xiao, Kaiqiang Zhu, Youwei Liu, Houjun Sun, Zengping Chen
Summary: This paper presents a 1-bit wideband electronically reconfigurable reflectarray in the Ku-band. By using a stacked microstrip structure and a 1-bit microstrip line-slot line-microstrip line phase shifter, the wideband and reconfigurable characteristics are achieved. The novel receiving-phase shift-transmitting unit cell is obtained by connecting two stacked microstrip structures, showing polarization rotation. Experimental results demonstrate that the reflectarray can achieve beam scanning.
Article
Engineering, Electrical & Electronic
Hung Luyen, Zongtang Zhang, John H. Booske, Nader Behdad
Summary: We propose a wideband reflectarray antenna with electronic beam-steering capability. The reflectarray uses an electronically reconfigurable polarization-rotating unit cell to achieve beam-steering. We construct a prototype with 256 elements to demonstrate the effectiveness of the design concept.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Information Systems
Miguel Ferrando-Rocher, Jose Ignacio Herranz-Herruzo, Alejandro Valero-Nogueira, Bernardo Bernardo-Clemente
Summary: This study presents a low-profile circularly-polarized sequential rotation fed 4x4 array antenna that operates in the Ka-band. The antenna features a single-layer sequential rotation feed network implemented using a combination of groove and ridge gap waveguides. Experimental results demonstrate that the antenna has a matching below -10 dB and a measured axial ratio below 1.3 dB in the desired band.
Article
Engineering, Electrical & Electronic
Gexing Kong, Xiangqiang Li, Qingfeng Wang, Jianqiong Zhang
Summary: A wideband high-power dual-branch helical reflectarray antenna design is proposed, with full-wave simulations and measurements showing good performance in terms of maximum gain, gain bandwidth, reflection coefficient, axial ratio, aperture efficiency, and beam-scanning capabilities. The proposed antenna design demonstrates feasibility and is shown to have a power-handling capacity of approximately 358 MW under vacuum conditions.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Mustafa K. Taher Al-Nuaimi, William George Whittow, Guan-Long Huang, Rui-Sen Chen, Sai-Wai Wong
Summary: This letter presents a fast and efficient metasurface design approach using ray-tracing theory to guarantee wide-angle low scattering and wideband RCS reduction. By engineering the proposed metasurfaces to exhibit a diffusive parabolic phase distribution, the reflected energies are redirected over all directions at frequencies other than the center frequency. Numerical and experimental results demonstrate the effectiveness of the designed metasurfaces in achieving significant RCS reduction over a wideband frequency range.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Computer Science, Information Systems
Joshua S. Roper, Andrew F. Peterson
Summary: This paper proposes a hybrid electromagnetics and communications model to quantify the performance degradation of non-timed array antennas caused by time delay. It investigates partial mitigation techniques and suggests design recommendations for array size, steering angle, and symbol rate in satellite communications. The study also explores alternative methods, such as equalization-based, spatial-based or amplification-based approaches, to mitigate the problem of true time delay.
Article
Engineering, Electrical & Electronic
Lehu Wen, Steven Gao, Qi Luo, Wei Hu, Benito Sanz-Izquierdo, Xue-Xia Yang
Summary: In this paper, a wideband circularly polarized reflectarray antenna using rotational symmetrical crossed dipoles is proposed. Coupled crossed dipoles are investigated for the first time as the unit cell to achieve wideband reflection bandwidth in the antenna design. The CP reflection bandwidth is greatly improved and adjusted by controlling the coupling between the crossed dipoles, thanks to the excitation of two series resonances and two parallel resonances on the crossed dipoles. A collimated CP RA antenna with a circular aperture of 316 unit cells is designed based on this unit cell, and a wide CP bandwidth of 7.6-15.9 GHz is achieved with AR<3 dB.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Sanghamitro Das, Satish Kumar Sharma, Seth W. Waldstein, James M. Downey, Bryan L. Schoenholz, Sarah M. Dever, James A. Nessel, Rudraishwarya Banerjee
Summary: A novel flat-panel 8x8 wideband dual circularly polarized (CP) electronically scanned phased array antenna is proposed for satellite communications. It uses CP stacked microstrip patch antennas as element radiators with structural modifications to minimize gain variation. Sequential rotation is employed to achieve a wide axial ratio (AR) bandwidth, and a beamforming network (BFN) is integrated within the phased array for independent control of input amplitudes and phases. Experimental results show good correspondence with simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Jose I. Herranz-Herruzo, Miguel Ferrando-Rocher, Alejandro Valero-Nogueira, Bernardo Bernardo-Clemente
Summary: An H-shaped all-metal radiating element with an active and a coupled slot is proposed for designing wideband high-efficiency circularly polarized antenna arrays. A simple and scalable two-layer corporate network implemented in groove gap waveguide (GGW) technology is conceived to feed an array of such radiating elements. The experimental results of a prototype confirm the good frequency properties, with a 1-dB AR bandwidth of 22%, a peak radiation efficiency of 97%, and an impedance bandwidth of 21%.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Daniel Martinez-de-Rioja, Eduardo Martinez-de-Rioja, Yolanda Rodriguez-Vaqueiro, Jose A. Encinar, Antonio Pino, Marcos Arias, Giovanni Toso
Summary: This paper presents the design of a multibeam parabolic reflectarray capable of generating two adjacent beams in orthogonal circular polarization at both the Tx and Rx frequencies in the Ka-band. The concept has been validated by designing, manufacturing, and testing a 90 cm parabolic reflectarray that can produce multiple adjacent beams at 20 and 30 GHz.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Multidisciplinary Sciences
Bing Ma, Fan Lu, Guoping Zhi, Xin Xue, Xiangni Zhao, Chao Ma, Yong Fan, Mei Yang
Summary: A X-band reflectarray antenna using 16x12 double square ring elements for satellite communications is proposed, with a prototype featuring right-hand circular polarization (RHCP). The antenna shows good performance with an aperture efficiency of 40.7% and a 3-dB gain bandwidth of about 10%. Good agreements between simulations and measurements were demonstrated.
SCIENTIFIC REPORTS
(2021)
Article
Computer Science, Information Systems
Eduardo Martinez-de-Rioja, Daniel Martinez-de-Rioja, Rafael Lopez-Saez, Ignacio Linares, Jose A. Encinar
Summary: This paper presents two designs of high-efficiency polarizer reflectarray antennas capable of generating a collimated beam in dual-circular polarization using a linearly polarized feed, suitable for high-gain antennas for data transmission links from Cubesats. The first design operates in the 17.2-22.7 GHz band with aperture efficiencies of 52.7% for RHCP and 57.3% for LHCP, higher than previous works. The second design, a dual-band polarizer reflectarray, operates in the 20 GHz and 30 GHz frequency bands, reducing complexity and cost of the feed chain while eliminating the need for a linear-to-circular polarizer.
Article
Engineering, Electrical & Electronic
Angel Palomares-Caballero, Carlos Molero, Pablo Padilla, Maria Garcia-Vigueras, Raphael Gillard
Summary: This article presents a metal-only reflectarray that can control incident orthogonal polarizations in a large bandwidth. The proposed reflectarray is based on a unit cell that allows independent control of reflection phase for vertical and horizontal polarizations. The unit cell provides a fairly linear phase response and the reflectarray achieves great performance with a simulated directivity greater than 27 dBi and an axial ratio below 1.5 dB within a bandwidth of 32 to 50 GHz.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Luyang Sun, Yongjiu Zhao, Jiaqing Chen, Lei Xing
Summary: A wideband circularly polarized reflectarray utilizing novel single layer multi-resonant Pancharatnam-Berry (PB) phase elements has been proposed, demonstrating excellent performance in terms of broadband coverage and efficiency. This design shows promise for satellite communication applications.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Qiqi Zhou, Lu Guo, Wenjie Feng
Summary: This research presents the design of a single-layer wideband circularly polarized reflectarray using a linearly polarized feed. By manipulating the embedded slot length, the design achieves linear phase and generates a circularly polarized radiating wave. The experimental results show that the design has good overall performance.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Junwei Zhang, Wei Liu, Chao Gu, Steven Shichang Gao, Qi Luo
Summary: A novel design is proposed to achieve multi-beam multiplexing for arbitrary directions based on the interleaved subarray architecture, considering two practical application constraints. One constraint is the equal magnitude constraint on the analogue coefficients to achieve beamforming with pure phase shifters after normalization of magnitudes, while the other is a robust constraint against steering vector errors. Designed examples are provided to demonstrate the effectiveness of the proposed method.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Guangshang Cheng, Minmin Tian, Long Zhang, Zhixiang Huang
Summary: Based on the theory of characteristic modes (TCM), a novel pattern-reconfigurable dual-port multiple-input-multiple-output (MIMO) antenna with four operating states at the 2.4 GHz ISM band is proposed. The antenna consists of a rectangular platform (RP), excitation units, and a reconfigurable feeding network. By controlling the reconfigurable feeding network using four switches, the two orthogonal characteristic modes associated with the two ports are switched, generating four possible operating states for the reconfigurable MIMO antenna. A prototype is fabricated to demonstrate the proposed TCM-based conceptual design, and the measured results agree well with the simulated ones. Furthermore, the port isolations of the proposed MIMO antenna are higher than 36 dB.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Yifeng Qin, Long Zhang, Chun-Xu Mao, Hongyi Zhu
Summary: In this letter, a novel miniaturized wideband dual-polarized antenna for MIMO applications is proposed. It is based on cross magnetic dipoles and a backed cavity. The antenna utilizes dipoles with exponential curvature edges and introduces four parasitic resonators to enhance its impedance matching. It also employs a wideband hybrid ring coupler to generate +/- 45 degrees polarization. The prototype of the antenna is fabricated and measured, showing good agreement with simulation results.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Wenting Li, Hancheng Tu, Yejun He, Long Zhang, Sai-Wai Wong, Steven Gao
Summary: In this paper, a new tightly coupled dual-polarized reflectarray antenna is proposed, which consists of a dual-polarized feed antenna and a wideband dual-polarized reflecting surface. The reflecting surface is composed of dual-polarized tightly coupled unit cells, each containing two types of elements with perpendicular polarizations. The design is verified through simulation, manufacturing, and measurement, showing good agreement between simulated and measured results, with stable radiation patterns in the operating band.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Lehu Wen, Steven Gao, Qi Luo, Wei Hu, Benito Sanz-Izquierdo, Xue-Xia Yang
Summary: In this paper, a wideband circularly polarized reflectarray antenna using rotational symmetrical crossed dipoles is proposed. Coupled crossed dipoles are investigated for the first time as the unit cell to achieve wideband reflection bandwidth in the antenna design. The CP reflection bandwidth is greatly improved and adjusted by controlling the coupling between the crossed dipoles, thanks to the excitation of two series resonances and two parallel resonances on the crossed dipoles. A collimated CP RA antenna with a circular aperture of 316 unit cells is designed based on this unit cell, and a wide CP bandwidth of 7.6-15.9 GHz is achieved with AR<3 dB.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Lin Wang, Sai-Wai Wong, Wei-Hang Huang, Long Zhang, Wenting Li, Yejun He
Summary: A novel grid dielectric resonator antenna (DRA) planar array is proposed in this study, which greatly simplifies the complexity of the feeding network and achieves high-performance antenna characteristics.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yifeng Qin, Long Zhang, Chunxu Mao, Hongyi Zhu
Summary: A low-profile compact tri-band (2.45/3.5/5.8 GHz) reconfigurable antenna with versatile radiation modes is proposed for portable wireless communication in this study. The antenna consists of a patch radiator with T-shaped cuts, meander-slot defected ground, and shorting pins, which enables three frequency bands with different radiation patterns. The antenna features a compact volume and exhibits omnidirectional radiations at 2.45 and 5.8 GHz and unidirectional radiation at 3.5 GHz. By applying different dc biases to the varactors, the operating bands can be tuned. The fabricated antenna shows good agreement between measured and simulated results. This miniaturized tri-band antenna has potential applications in portable wireless services and intelligent transport devices.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Zhenqin Zheng, Long Zhang, Qi Luo, Chunxu Mao, Yejun He, Steven Gao
Summary: This research proposes a wideband 3-D-printed transmit-reflect-array (TRA) antenna that can generate independent transmission and reflection beams over a wide bandwidth. The TRA element, composed of a dielectric post and three copper wires, can be fabricated using low-cost 3-D printing. The measured results show high gain and wide bandwidth for both the transmitarray (TA) and reflectarray (RA) functions of the 3-D-printed TRA antenna, making it appealing for various wireless applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Peng Chu, Jianguo Feng, Lei Guo, Long Zhang, Wen-Wen Yang, Leilei Liu, Feng Xu, Ke Wu
Summary: Traditional mixed coupling techniques can only eliminate the transmission of the first spurious mode. The proposed new mixed coupling structure with both slots for magnetic coupling and holes for electric coupling can achieve a total coupling/transmission of multiple spurious modes equal to zero. The experimental result shows that the prototype of a multilayer SIW filter can efficiently eliminate all spurious modes below TE404 with a stopband extended to 4.02 f(0). This technique not only extends the stopband of SIW filters but also expands the application scope of mixed coupling.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Peng Chu, Peng Zhu, Jianguo Feng, Lei Guo, Long Zhang, Fang Zhu, Leilei Liu, Guo Qing Luo, Ke Wu
Summary: This article explores the flexible use of mixed coupling in substrate integrated waveguide (SIW) filters to improve selectivity. A mixed coupling structure is proposed as a universal module to produce transmission zeros (TZs) in SIW filters without degrading their superiority. Additionally, a trisection with mixed cross-coupling is proposed to efficiently produce a quasi-elliptic response in SIW filters. Three prototypes were designed, fabricated, and measured, with results aligning with expectations. These techniques will facilitate the development of high-performance SIW filters in microwave/wireless circuits and systems.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Engineering, Manufacturing
Xuzhou Yu, Sai-Wai Wong, Jing-Yu Lin, Yejun He, Wenting Li, Long Zhang, Lei Zhu, Li Yu
Summary: This article proposes a design of a bandpass filter (BPF) based on stepped window resonators (SWRs) that allows inline resonators to generate transmission zeros (TZs). The proposed SWR consists of two metal cavities without any coupling iris, with the larger cavity acting as a bandstop resonator to provide TZs near the passband. The design methodology is validated through the fabrication and measurement of a fourth-order inline BPF with a fractional bandwidth of 1% at 10 GHz.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Hui Chen, Long Zhang, Chunxu Mao, Jian Dong, Yejun He
Summary: This paper proposes a compact millimeter-wave polarizer that converts a linear polarization wave into circular polarization. The polarizer is made of a single-layer metal plate with three ring slots, and the size of the ring slots is optimized using the simulated annealing algorithm. The optimized polarizer has a resonant frequency of 30GHz, a 3dB axial ratio bandwidth of 10%, and a minimum AR value of 0.3 dB at 30GHz.
2022 IEEE MTT-S INTERNATIONAL MICROWAVE WORKSHOP SERIES ON ADVANCED MATERIALS AND PROCESSES FOR RF AND THZ APPLICATIONS, IMWS-AMP
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Zhenqin Zheng, Long Zhang, Qi Luo, Chunxu Mao, Yejun He
Summary: In this paper, a waveguide-type reflectarray element is designed to form a 16 x 16 reflectarray antenna, which generates a pencil beam pointing to the broadside direction. The reflectarray antenna achieves stable high-gain beam from 25 to 35 GHz with low sidelobe level, making it a promising candidate for millimeter-wave applications and 5G.
2022 IEEE 10TH ASIA-PACIFIC CONFERENCE ON ANTENNAS AND PROPAGATION, APCAP
(2022)
Article
Engineering, Electrical & Electronic
Yejun He, Wei Huang, Zhou He, Long Zhang, Xiaobing Gao, Zhi Zeng
Summary: This paper proposes a novel compact, dual-polarized, dual-broadband shared-aperture antenna array unit for 5G mobile communications. By introducing L-shaped parasitic branches, the LB element expands the bandwidth and suppresses the mutual coupling with UB elements. Experimental results demonstrate that the antenna achieves high port isolation and stable radiation pattern required for dual-band base station antennas.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2022)