Article
Engineering, Electrical & Electronic
Victoria A. Carey, Matthew R. Konkol, Shouyuan Shi, Andrew J. Mercante, Kevin Shreve, Andrew A. Wright, Christopher A. Schuetz, Dennis W. Prather
Summary: The study introduces a tightly coupled array antenna excited by high-power photodiodes, which utilizes thinned photodiode substrates and the photonic approach for improved bandwidth performance. Circuit and full wave simulations, as well as prototype testing, demonstrate the superior performance of the design in radiated power bandwidth and scan angles.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Hengfei Xu, Pu Wei, Shu Jiang, Zhiqiang Yu, Jianyi Zhou, Chuanqing Liu
Summary: A wideband circularly polarized (CP) planar U-shaped antenna array is proposed for millimeter-wave (mm-wave) applications. The antenna element consists of two tilted parasitic U-shaped patches fed by a slot etched on a substrate integrated waveguide (SIW), achieving an improved simulated axial ratio (AR) bandwidth of 40%. The proposed antenna array, based on the CP element, multiple SIW cavities, and a 16-way SIW feeding network, demonstrates excellent performance and a novel structure, making it a promising candidate for mm-wave wireless systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yang Cheng, Yuandan Dong
Summary: A novel wideband circularly polarized planar array antenna is proposed in this article for 5G millimeter-wave applications, with new polarizers incorporating suspending metal posts to achieve expanded axial ratio bandwidth. The antenna is designed to cover most of the current 5G mm-wave bands, offering good radiation performance and a low profile design.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Xin Quan, Zhenxin Cao, Huaimin Zhou, Shengchi Zhu, Guohu Deng, Changzhi Xu
Summary: Common-mode resonance in traditional tightly coupled arrays severely limits bandwidth. In this communication, a common-mode resonance suppressing surface (CRSS) is proposed to mitigate the common-mode resonance. The CRSS is a surface etched with slots along the polarized direction placed below the antenna array to replace the ground of traditional TCAs. The CRSS cuts off the surface current on the ground, and thus the common-mode resonance is mitigated. Furthermore, a dual-linear polarized TCA embedded with the CRSS is simulated and manufactured, achieving an impedance bandwidth of 9.3:1 (0.6-5.58 GHz) and more than 90% radiation efficiency.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Yang Wang, Xiao Ding, Lin-Man Zhang, Wei Shao, Bing-Zhong Wang
Summary: This article introduces an aperiodic wideband high isolation dual circularly polarized (CP) scanning array. A novel aperiodic array optimization method based on the perturbation principle is proposed, which solves the grating lobes problem and reduces the number of array elements, saving energy and reducing cost. The proposed array element has an impedance bandwidth of 58%, better than previous reports. The formed 16-element aperiodic array achieves a 2-D low side lobe level (SLL) with +/- 45 degrees beam scanning across the entire operating band, improving interference avoidance ability. Compared with a 25-element uniform array, 36% transmitter and receiver components are saved.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yingsong Zhang, Wei Hong, Zhidan Ding, Long Yang, Cheng Zhu, Yun Hu
Summary: In this article, a millimeter-wave LHCP 1 x 32 with a dummy on both sides phased array antenna is proposed. The antenna utilizes a multilayer structure and single feed, with a metasurface patch of 3 x 3. The measurements show an impedance bandwidth of 20%, from 22.5 to 27.5 GHz, and an axial ratio bandwidth of 3.35 GHz, ranging from 24.15 to 27.5 GHz.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Lu Yin, Peng Yang, Qianwei Zeng, Peng Zhang, Tao Dong, Jun Hu, Zaiping Nie
Summary: This paper reports a low-cost, dual-circularly-polarized (CP) 2-bit antenna operating at 10 GHz. The antenna utilizes a square-ring patch as a radiator and can achieve 0 degrees, 90 degrees, 180 degrees, and 270 degrees phase shift and CP reconfigurability by controlling the feeding direction of the T-shaped coupling microstrip line and the position of the perturbation corner. An eight-element linear array is used to demonstrate the beam scanning performance, which can steer the main beam from 0 degrees to 40 degrees by controlling the ON or OFF of the p-i-n diodes. Simulated and measured results show good agreement within the steering beams, confirming the functionality of the antenna.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yizhen Xu, Zilin Peng, Sichao Wen, Yuandan Dong
Summary: This paper presents a compact omnidirectional circularly polarized (OCP) linear antenna array with a planar configuration. By analyzing a shorted half mode patch antenna and introducing periodic structure changes, two naturally parallel arrays are obtained and integrated into a compact format to achieve OCP radiation. Experimental results verify the effectiveness of the design.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Nanoscience & Nanotechnology
Chen Liao, Yu Zhang, Shang-Hui Ye, Wen-Hua Zheng
Summary: The work describes the construction of a novel planar chiral [2.2]paracyclophane-based TADF-active molecule with CPL, which exhibits highly efficient luminescence performances and excellent CPL properties. The enantiomers show excellent TADF activities and the molecule has a small energy difference between singlet and triplet states. Additionally, a solution-processed yellow CP-OLEDs based on the molecule demonstrates high brightness, external quantum efficiency, and CPL signal.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Deepak Kumar Barik, Kalyan Mondal, Mohd Azharuddin
Summary: A G-shaped circularly polarized antenna with broad axial ratio bandwidth (ARBW) and high gain is proposed in this paper. The antenna is designed on an affordable FR4 substrate with dimensions of 0.36 lambda 0 x 0.39 lambda 0 x 0.02 lambda 0. By modifying a conventional monopole radiator, a G-shaped patch is created to achieve circular polarization. Additional stubs and parasitic strips are added to improve the performance of ARBW and gain. The fabricated antenna demonstrates a percentage impedance bandwidth of 106%, ARBW of 97%, angle coverage of 102 degrees, and a gain of 5 dBic at 4.26 GHz, making it suitable for WLAN and broadband wireless communication systems according to IEEE standards.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Guang-Hua Sun, Hang Wong
Summary: This paper introduces a cost-effective solution for the development of a millimeter-wave antenna array. An elliptical cavity-backed patch antenna array is suggested to achieve wideband and high-gain circularly polarized signals. The array is constructed using only two PCBs and a metallic fixture. It has wide impedance and axial ratio bandwidths, making it suitable for long-range millimeter-wave communications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Shan-Shan Gu, Wen-Jun Lu, Xiao-Hui Mao, Lei Zhu
Summary: This paper presents a design approach for a planar dual-sense bidirectional circularly polarized antenna and verifies its performance through numerical simulations and experiments on a prototype antenna. The proposed antenna exhibits a wide flared angle range and has a wide impedance bandwidth and 3 dB axial ratio bandwidth. It also provides spatial and polarization diversity capabilities in a low-profile design.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Hanguang Liao, Atif Shamim
Summary: In this letter, a high-aperture-efficiency (eta(AP)), right-hand circularly polarized (RHCP), sequentially rotated hexagonal microstrip antenna array for GPS L1 band is proposed. The antenna design is placed on a hexagonal top of a floating sensor node for ocean and marine monitoring applications. The design effectively utilizes the hexagonal area and maximizes the aperture efficiency by distributing centrosymmetric CP microstrip antenna elements on the hexagonal substrate.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Ruo Fei Ma, Zhi Hao Jiang, Yan Zhang, Xin Yu Wu, Taiwei Yue, Wei Hong, Douglas H. Werner
Summary: This article presents the theory, design, and validation of planar array antennas capable of producing dual-circularly-polarized (dual-CP) dual-beam radiation with a single feeding network. The independently controlled properties of the formed CP beams with different handedness are achieved by exploiting in-plane rotation-induced Berry phase and excitation phase. Microstrip patch arrays with such single-feed dual-CP dual-beam functionalities show satisfactory performance in experiments, making them promising candidates for various applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Chunling Chen
Summary: An ultraminiature circularly polarized microstrip patch antenna is designed using four metal-insulator-metal (MIM) capacitors. Lumped capacitors are added to the edge of the conventional microstrip patch antenna for simulation of the theoretical model. It is found that careful selection of capacitors enables the microstrip patch antenna to achieve electrically small (ka < 1). The capacitors optimize axial ratio and resonance, providing an effective method for designing a compact circularly polarized antenna. The proposed method is validated through the design, fabrication, and measurement of a circularly polarized electrically small microstrip patch antenna.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Alibakhshikenari, Bal S. Virdee, Chan Hwang See, Pancham Shukla, Sadegh Mansouri Moghaddam, Ashraf Uz Zaman, Samia Shafqaat, Mobayode O. Akinsolu, Bo Liu, Jian Yang, Raed Abd-Alhameed, Francisco Falcone, Ernesto Limiti
Summary: In this article, a novel dual-polarized highly folded self-grounded Bowtie antenna is proposed for sub-6 GHz 5G MIMO antenna systems. The antenna is excited through I-shaped slots and offers a compact structure with high gain and efficiency.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Jichao Feng, Zehong Yan, Shuyang Yang, Fangfang Fan, Tianling Zhang, Xiaosong Liu, Xiaofei Zhao, Qinglin Chen
Summary: This paper presents a dual circularly polarized reflect-transmit-array (RTA) antenna with independent beam control, capable of transmitting LHCP wave and reflecting RHCP wave in the frequency range of 8.7-10.2 GHz. The antenna achieves 360 degrees phase shift for each circularly polarized wave by rotating the top and bottom patches. Experimental results demonstrate the antenna's performance in terms of gain, bandwidth, and axial ratio for LHCP and RHCP radiation.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Jonas Flygare, Jian Yang, Alexander W. Pollak, Robert E. J. Watkins, Fiona Hillier, Leif Helldner, Sven-Erik Ferm
Summary: In this article, a novel dielectrically loaded quad-ridge flared horn (QRFH) is introduced as a reflector feed with beyond-decade ultrawideband performance. The feed covers the 1-20 GHz bandwidth with good isolation between two orthogonal polarized ports. The QRFH was tested in a paraboloidal reflector and achieved promising results.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Prabhat Khanal, Jian Yang, Marianna Ivashina, Anders Hook, Ruoshan Luo, Per Hallander, Mussie Gebretnsae
Summary: This article proposes a low-profile, wide-scanning phased-array antenna of vertical bowtie elements that is fully integrated with a structurally efficient radome and ribs of an aircraft fuselage. The array antenna meets the electrical requirements of an airborne antenna sensor and the mechanical requirements of a load-carrying aircraft fuselage. The antenna is capable of beam steering in the azimuth plane and achieves good stiffness and performance in the vibration loads of commercial transport aircraft.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Zhaorui Zang, Ashraf Uz Zaman, Jian Yang
Summary: This article proposes a series-fed, single-layer dual-circularly polarized slot array antenna that is fed by a stepped ridge gap waveguide (RGW) at the 77-GHz band. The antenna is capable of generating dual-circularly polarized waves, making it suitable for next-generation polarimetric radar in automotive applications. The antenna consists of eight columns of linear arrays and two feeding ports for exciting the slots. The design process and measured results are presented in this article. The measured results demonstrate that the achieved gain of the proposed antenna is above 27.3 dBi, with an axial ratio of about 2 dB over the frequency range of 76-79 GHz, exhibiting dual-CP patterns. The S-11 and S-22 values for the proposed antenna are below -10 dB, and the measured port isolation is above 17.5 dB.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Xiaosong Liu, Zehong Yan, Enlin Wang, Xiaofei Zhao, Tianling Zhang, Fangfang Fan
Summary: In this communication, a novel amplitude-phase-controlled metasurface (APCMS) is presented, which allows for full 2 pi phase coverage and amplitude variation from 0 to 1 for transmissive waves. The APCMS is designed as a cambered surface by cascading three ultrathin printed circuit boards (PCBs) and two curved 3-D-printed substrates, making it suitable for space-constrained scenarios. Unlike phase-only controlled metasurfaces (MSs), the APCMS is used to construct a spatial power divider by superimposing multiple aperture fields assigned to amplitude weighting coefficients, providing a new degree of freedom. The proposed APCMS-based spatial power dividers demonstrate the generation of equal-power and unequal-power triple-beam radiation patterns at different and same elevation angles, respectively, with a maximum difference in realized gains of less than 0.9 dB at 12 GHz. The study holds potential applications in multibeam shaping and multiple target tracking systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Computer Science, Information Systems
Davoud Zarifi, Ali Farahbakhsh, Ashraf Uz Zaman
Summary: This paper introduces a six-port low-loss waveguide coupler based on ridge gap waveguide structure, which has potential application in various mmWave wireless systems. The challenges in fabrication faced at mmWave frequencies can be overcome by using the gap waveguide technology. The proposed structure, excited by standard WR-28 waveguide flanges at the bottom, is confirmed to operate at 30 GHz with 15% bandwidth, return loss higher than 15 dB in both input ports, and isolation level better than 15 dB.
Article
Computer Science, Information Systems
Sadia Farjana, Esperanza Alfonso, Per Lundgren, Vessen Vassilev, Peter Enoksson, Ashraf Uz Zaman
Summary: This article introduces the first application of a multilayer dry film photoresist for fabricating a slot array antenna via micromachining. The proposed fabrication process provides a straightforward and efficient method for achieving highly accurate antenna structures with delicate features above 100 GHz. The fabricated antenna, based on gap waveguide technology, consists of a slot layer and a feed layer with a transition to measuring waveguide. Coated with Ti and Au, the antenna demonstrates good accuracy, with the measured input reflection coefficient and antenna gain aligning well with simulations. In addition, the antenna exhibits insignificant degradation in a thermal cycling test over a typical temperature gradient range for outdoor wireless applications.
Article
Computer Science, Information Systems
Qiannan Ren, Carlo Bencivenni, Giorgio Carluccio, Harshitha Thippur Shivamurthy, Anton De Graauw, Feike Jansen, Jian Yang, Ashraf Uz Zaman
Summary: In this paper, a 77 GHz gapwaveguide radar antenna system with launcher-in-package (LiP) technology is proposed for automotive imaging applications. The LiP technology integrated with radar transceivers is equipped with waveguide interfaces for RF connection, enabling direct integration with waveguide antennas. The robust interconnects for coupling transceivers to waveguide antennas with non-galvanic contacts are proposed using gapwaveguide packaging technology. The results show that the proposed gapwaveguide imaging radar antenna in conjunction with the novel LiP packaging is able to serve the radar system properly.
Article
Engineering, Electrical & Electronic
Enlin Wang, Sam Agneessens, Ashraf Uz Zaman, Hanna Karlsson, Zehong Yan, Jian Yang
Summary: Two types of low-loss mechanically reconfigurable phase shifters based on gap waveguide technology are proposed. Phase shifts are achieved through mechanical movements and quasi-PEC-AMC structures are implemented to avoid wave leakage and undesired resonances. The fabricated phase shifters show insertion losses of about 0.4 and 0.3 dB, and reflection coefficients better than -13 and -15 dB for the slow wave and width variation, respectively, over 71-86 GHz.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Enlin Wang, Ashraf Uz Zaman, Zehong Yan, Jian Yang
Summary: This letter presents a novel easy-to-manufacture ball-pen gap waveguide (GW) that utilizes commercial low-cost ball pens for mechanical reconfigurability. The proposed ball-pen GW is low cost and achieves smooth low-friction sliding movements using the balls of the ball-pen tips, demonstrating excellent transmission performance and movability.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
