Article
Engineering, Electrical & Electronic
Jianping Zeng, Xiuye Liang, Lianxing He, Fang Guan, Feng Han Lin, Jian Zi
Summary: A method of triple-mode operation by capacitive slot loading is proposed for enhancing the bandwidth of single-fed circularly polarized patch antennas. The method offers reduced constraints, lower complexity, and a higher degree of freedom for antenna design. Two new antennas, a U-slot antenna and an E-shaped antenna, are designed based on this method and demonstrate wideband CP radiation with significant improvements in bandwidth compared to conventional antennas.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
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
Sirous Bahrami, Gholamhosein Moloudian, Ho-Jin Song, John L. Buckley
Summary: This paper proposes a tunable circularly polarized antenna with a reconfigurable integrated feed network for cognitive radio applications. The feed network consists of an ultrawideband bandpass filter, a tunable T-shaped resonator, and an L-shaped microstrip line. The antenna achieves wideband and narrowband operation modes, providing flexibility for different applications in cognitive radio systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Review
Chemistry, Analytical
Rajasekhar Nalanagula, Naresh K. Darimireddy, Runa Kumari, Chan-Wang Park, R. Ramana Reddy
Summary: Recent trends in dielectric resonator antenna research include the use of compound and hybrid structures, which have shown interesting and significant features in terms of bandwidth, gain, and circular polarization generation. This critical review discusses the evolution of circularly polarized hybrid dielectric resonator antennas, with a general discussion on circular polarization and DR antennas, along with indications of future challenges and new design ideas. Additionally, state-of-the-art advances and associated design challenges of circularly polarized hybrid DR antennas are discussed, including empirical formulas to find resonance frequency of different hybrid modes.
Article
Engineering, Electrical & Electronic
Hongcai Yang, Xiongying Liu, Yi Fan
Summary: This study investigates a broadband circularly polarized textile antenna and its wearable conformal antenna array for body-centric communications. The proposed antenna demonstrates wide impedance and axial ratio bandwidths, flexibility, and conformal characteristics, making it suitable for various wearable applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
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
Hao Cheng, Gaobiao Xiao, Xiaocheng Wang
Summary: This letter presents a low-profile wideband antenna operating around 28 GHz using a nonperiodic artificial magnetic conductor (AMC). The bandwidth is broadened by loading mushroom structures with a central patch, and cross polarization is suppressed by adding four vias at the edges. The integration of a parasitically coupled structure with the AMC creates five resonant modes. Characteristic mode analysis and effective relative permittivity of the AMC are calculated to explain the mechanism behind the bandwidth broadening. A prototype is fabricated and the measured results show a wide impedance bandwidth of 33% (24.05-33.52 GHz) and a high peak gain of 10.24 dBi.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Zimu Zhang, Yongzhi Cheng, Hui Luo, Fu Chen
Summary: This paper proposes a wideband circular polarization metasurface antenna, consisting of a centrosymmetric structure with a mode suppressor and an asymmetric aperture-coupled feed structure separated by dielectric substrates. Two orthogonal modes with a 90 degrees phase difference are excited by an L-shaped slot and a microstrip line in the aperture-coupled feed structure to achieve CP radiation. Two methods are proposed to expand the CP bandwidth: directly suppressing the characteristic mode and indirectly suppressing it using a mode suppressor. The fabricated antenna shows a low profile of ?(0) x ?(0) x 0.075 ?(0) at 5 GHz, with a 3 dB axial ratio bandwidth of 45.2% (4.1-6.5 GHz), an impedance bandwidth of 41.8% (4.1-6.31 GHz), and a peak gain of 7.94 dBic at 5.9 GHz.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Lei Wang, Zhangming Zhu, Yunfei En
Summary: The letter introduces two novel broadband circularly polarized slot-microstrip antennas with circular and square structures. The circular SMPA utilizes parasitic elements to excite multiple CP resonant modes and improve the CP bandwidth. The proposed circular SMPA has a broad bandwidth suitable for various frequency applications.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Luiza Leszkowska, Mateusz Rzymowski, Krzysztof Nyka, Lukasz Kulas
Summary: The letter presents a concept of a high-gain circularly polarized X-band antenna with a partially reflecting surface (PRS). The antenna offers a wide bandwidth and circular polarization, suitable for CubeSat communication systems, drones, and high-altitude pseudosatellite applications. The compact and lightweight design makes it versatile for various scenarios.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
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
Computer Science, Information Systems
Mohamed El Hammoumi, Faisel Tubbal, Najiba El Amrani El Idrissi, Panagiotis Ioannis Theoharis, Suhila Abulgasem, Raad Raad
Summary: This paper presents a novel wideband circularly polarized CPW-fed printed monopole antenna with an AMC reflector, which offers a wide impedance bandwidth and 3 dB axial ratio bandwidth. The proposed antenna has a smaller physical size while providing higher gain compared to other designs. The measured results show a wide impedance bandwidth of 97.5% (6.1-13.9 GHz), a wide 3 dB axial ratio bandwidth of 98.75% (5.1-13 GHz), and a total measured gain of 7.3 dBi at 8 GHz.
Article
Engineering, Electrical & Electronic
Rui Xu, Jie Liu, Kun Wei, Wei Hu, Zi-Jian Xing, Jian-Ying Li, Steven Shichang Gao
Summary: This article presents a low-profile high-efficiency dual-band circularly polarized (CP) antenna and its array for RFID reader applications. The use of a novel dual-band antenna element and an artificial magnetic conductor (AMC) improves antenna performance, while a rotated sequential phase feed CP array achieves wider 3 dB axial ratio bandwidths. The new antenna array has a simpler configuration and wider axial ratio bandwidths compared to previous dual-band CP reader antennas.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Xiaohe Cheng, Yuan Yao, Tao Yu, Junsheng Yu, Xiaodong Chen
Summary: This paper proposes a novel millimeter-wave wideband dual circularly polarized antipodal septum antenna, which enhances the antenna's operating bandwidth by introducing symmetric septum blades and corresponding feeding network. The working principle of the generation process of dual circular polarization is explained using a three-port model, and the asymmetric radiation pattern caused by high-order modes is eliminated.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
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
Xiangkun Kong, Xin Jin, Xuemeng Wang, Weihao Lin, He Wang, Zuwei Cao, Steven Gao
Summary: This letter presents a switchable frequency-selective rasorber (SFSR) that can switch from transmission to reflection. By adding feeders and PIN diodes based on cascaded two-dimensional lossy and lossless frequency-selective surface screens, the SFSR can achieve out-of-band absorption. The working state of the SFSR can be switched by changing the state of the PIN diodes, from low-frequency reflection and high-frequency transmission to low-frequency transmission and high-frequency reflection.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Ming-Ming Chen, Xue-Xia Yang, Steven Gao
Summary: A metal-perovskite hybrid metamaterial with a gold cross and two gold arcs is introduced, which exhibits an electromagnetically induced transparency (EIT) effect at 0.75 THz based on bright-bright coupling. The EIT effect is resulted from the destructive interference between the electric dipole and the toroidal dipole, as confirmed by multipole scattering theory. The conductivity of the perovskite material can be tuned to dynamically control the EIT effect, achieving a modulation depth of 34% at 0.75 THz. The proposed EIT metamaterial also demonstrates tunable group delay and high sensitivity in the terahertz band, making it valuable for applications in modulators, slow light devices, and sensors.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Hisato Kashihara, Josaphat Tetuko Sri Sumantyo, Yuta Izumi, Koichi Ito, Steven Gao, Kazuteru Namba
Summary: Recently, unmanned aerial vehicles onboard synthetic aperture radar (UAV-SAR) have been developed for high-resolution, real-time data acquisition and local emergency observation. Our research group plans to develop a circularly polarized UAV-SAR using a 25 kg payload for disaster and environmental monitoring. We proposed a $4\times4$ ax-shaped radiator array antenna with high gain, broadband, and good antenna isolation and axial ratio. The antenna was simulated, fabricated, and measured in an anechoic chamber. The experimental results confirmed the performance of the circularly polarized SAR.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Wei Hu, Qiaosong Li, Hao Wu, Zhan Chen, Lehu Wen, Wen Jiang, Steven Gao
Summary: This paper presents a novel decoupling method for designing a dual-band closely arranged MIMO antenna pair with high isolation for 5G smartphones. By combining a bent loop and a T-shaped monopole into a compact space, multiple in-phase and out-of-phase modes are excited at two different bands to reduce mutual coupling. The proposed antenna pair achieves high isolation of over 24 dB without additional decoupling structures. An 8 x 8 MIMO system is developed using four such antenna pairs, operating at 3.3-3.6 GHz and 4.4-5.0 GHz, with isolation exceeding 12.8 dB, low envelope correlation coefficients (ECCs) below 0.18, and efficiencies above 71% and 68% in the respective bands. This MIMO system features dual-band operation, compact structure, and excellent isolation, providing a promising solution for 5G smartphone antenna design.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Environmental Sciences
Katsunoshin Nishi, Masaaki Kawai, Bowo Eko Cahyono, Mirza Muhammad Waqar, Kaori Nishi, Josaphat Tetuko Sri Sumantyo
Summary: Concerns about land subsidence recurrence have risen in Japan due to urban development and groundwater use. While land subsidence observation wells have been used for monitoring, the aging facilities have sparked interest in remote sensing technology. This paper evaluates the substitutability of Consecutive DInSAR with the land subsidence observation well, using SARPROZ software to analyze Sentinel 1 images from August 2017 to March 2022 in Kanagawa prefecture. The study also introduces a new calculation model to estimate land subsidence based on the law of material conservation. The results show that Consecutive DInSAR aligns with the observation well data, indicating potential future substitution.
GEOCARTO INTERNATIONAL
(2023)
Article
Environmental Sciences
Dodi Sudiana, Anugrah Indah Lestari, Indra Riyanto, Mia Rizkinia, Rahmat Arief, Anton Satria Prabuwono, Josaphat Tetuko Sri Sumantyo
Summary: Forest and land fires have significant impacts on various sectors, and it is necessary to identify the burned areas for fire control. Remote sensing is commonly used for rapid burned area identification, but there are limited studies on the combination of optical and SAR remote sensing data for this purpose. This research evaluates a hybrid CNN-RF model for burned area detection using Sentinel-1 and Sentinel-2 data, and the results show that the CNN-RF method provides the best accuracy, reaching 97%, with potential for improved precision. The estimated burned area using the hybrid CNN-RF method is 48,824.59 hectares with 90% accuracy compared to reference data.
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
Guangwei Yang, Qiao Cheng, Jianying Li, Shuai Zhang, Steven Gao, Xiaodong Chen
Summary: In this work, an innovative method is investigated to control the current distribution of the radiating patch by adjusting the input phase, resulting in both pattern and polarization reconfigurable characteristics. A compact and low-profile antenna with four fed ports is designed to implement this method, allowing for linear, RHCP, and LHCP polarization with different beam directions. A passive planar array is also designed and fabricated based on this antenna element, which can scan a coverage of +/- 70 degrees with low gain fluctuation and low sidelobe. The proposed antenna is a good solution for wireless communication systems due to its simple configuration, multifunction, and beamforming capability.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Jian-Feng Qian, Steven Gao, Benito Sanz-Izquierdo, Hanyang Wang, Hai Zhou, Huiliang Xu
Summary: This article presents a novel method for decoupling patch antennas by utilizing the TM20 mode. Stubs are loaded at the radiating edge of the patch to shift the resonance frequency of TM20 mode to the same band as the TM10 mode. The mutual coupling between the antennas is suppressed simply by physical placement, resulting in up to 20 dB improvement in isolation. The method can also be applied to MIMO arrays and dual-antenna systems with different operating bands.
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
Lehu Wen, Steven Gao, Qi Luo, Wei Hu, Benito Sanz-Izquierdo, Chao Wang, Xue-Xia Yang
Summary: A wideband transmitarray (TA) antenna using compact 2-bit filtering unit cells is presented, which features wide bandwidth, compact aperture size, filtering radiation performance, and low cross-polarization levels.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Jianfeng Qian, Steven Gao, Benito Sanz Izquierdo, Hanyang Wang, Hai Zhou, Huiliang Xu
Summary: This paper presents novel dual-polarized/duplex filtering antennas with a unique filtering feeding network. The feeding network utilizes an all-resonator structure with a common dual-mode resonator to achieve isolation of two well-isolated channels by exploiting even and odd modes. By applying balanced and unbalanced excitation, a hybrid-like feeding structure is created. Despite sharing a common resonator, the channels exhibit high isolation and a smaller overall size compared to conventional designs. Experimental results demonstrate isolations greater than 34 dB and 38 dB for dual-polarized and duplex cases, respectively. The proposed antennas outperform state-of-the-art developments in terms of compact size, flexible decoupling frequency ratio, and high isolation.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
