Recent Articles
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SIW Sub-Array Antenna With High Isolation Offering Dual-Polarized Monopulse Patterns
25 December 2023 Maksim Kuznetcov, Symon K. Podilchak and Mathini Sellathurai present a high isolation antenna which offers dual-polarization monopulse beam patterns, making the design suitable for polarization diverse or full-duplex (FD) systems. The single-layer structure is defined by a network of 2-D sub-arrays oriented in a cross-shape configuration using series-fed slots in substrate integrated waveguide (SIW) technology. Also, the proposed design exploits dual-differential feeding to achieve a −10 dB impedance matching bandwidth (BW) from 23.2 GHz to 25.4 GHz, and measured isolation values are more than 70 dB (peaking to about 90 dB) over this same operating range.
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Seamless Integration Technology for Filtenna Toward 5G/6G Wireless Communications
13 December 2023 Wei Hong, Zi-Jun Guo and Zhang-Cheng Hao review the design methodologies, operational principles, and implementation strategies of filtennas with illustrated examples in this paper. Whether in the context of 5G or 6G networks, base transceiver stations (BTS) require a substantial number of radio frequency (RF) transceiver chains and antenna array, particularly in mmWave frequency bands. It is known that bandpass RF filters between antenna elements and transceivers are key components for suppressing out-of-band spurs and interference. The single board seamless integration of transceivers and antennas has become a growing trend. It means there is no extra room for a large number of filters at mmWave bands, leading to the emergence of integrated designs that combine filtering circuitry with antennas, known as filtenna or filtering antenna.
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Dual-Linearly Polarized Magneto-Electric Dipole Antenna for In-Band Full-Duplex Applications
01 December 2023 Qian Tan and Kwai-Man Luk propose a dual-linearly polarized (DLP) magneto-electric (ME) dipole antenna for the in-band full-duplex (IBFD) application. It is formed by ME dipoles with a shared central part, giving a compact and symmetrical antenna structure. It has four isolated channels, two for dual-LP transmitting (TX) and the other two for dual-LP receiving (RX). Due to the symmetrical structure, it can provide similar radiation patterns for both the TX and RX ports. Good isolation between any two of all four ports is obtained over a wide frequency range by modifying the antenna structure without introducing any additional complex feeding structures.
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User Effects on Mobile Phone Antennas: Review and Potential Future Solutions
29 November 2023 Igor Syrytsin, Gert Frølund Pedersen and Shuai Zhang explore the significant impact of human proximity on antenna design evolution in mobile communication from GSM to LTE and future 5G technologies. The paper offers a comprehensive view of the challenges posed by human interactions in current antenna designs, alongside modern solutions to mitigate these issues.
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Design of a Dual-Branch Resonator End-Launcher for Low-Loss WBAN Communications Using Wearable Waveguide Surfaces
28 November 2023 Maria El Bacha, Fabien Ferrero and Leonardo Lizzi propose a compact 30 mm x 30 mm dual-branch resonator end-launcher to enable communication through a waveguide surface manufactured with textile-compatible material at 2.4GHz. A 25 mm x 25 mm clearance zone area is respected for electronic component integration. The end-launcher topology uses a balanced dual-branch configuration to maximize electromagnetic coupling with the flexible waveguide surface. A design methodology is proposed to co-design the end-launcher and the waveguide surface.
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Bandwidth Enhancement of H-Plane MIMO Patch Antennas in Integrated Sensing and Communication Applications
20 November 2023 Lina Ma, Zijian Shao, Jun Lai, Changzhan Gu and Junfa Mao propose a low-cost compact decoupled bandwidth enhancement technique to address the high mutual coupling issue between wideband closely-spaced multiple-input and multiple-out (MIMO) patch antennas. The wideband decoupling property is realized by combining two decoupling circuits introduced by defected ground structure (DGS) and coplanar decoupling structure, respectively. An equivalent circuit is given to clarify the decoupling mechanism and provide physical insight. To validate the feasibility of the proposed design scheme, two prototypes of decoupled wideband patch arrays based on coplanar-fed and probe-fed schemes are simulated, fabricated, and measured in the 5.8 GHz ISM band, respectively.
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A Compact, Circularly-Polarized, Substrate-Integrated Waveguide, Millimeter-Wave Beamsteering System for 5G Mobile Terminals
17 November 2023 Khaled Al-Amoodi, Rashid Mirzavand, Mohammad Mahdi Honari, Jordan Melzer, Duncan G. Elliott and Pedram Mousavi propose a compact, circularly-polarized (CP), end-fire, 4×1 continuous beamsteering antenna array implemented using substrate-integrated waveguides for 5G mobile terminals. The purpose of this system is to complement the radiation patterns of planar phased arrays on the faces of a typical mobile terminal. The proposed system seamlessly integrates previously-presented antennas and polarizers, with adjustable phase shifters and a feeding network in a multi-layered, single stack, printed circuit board (PCB) for continuous beamsteering in a compact package.
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Dual-Band Shared-Aperture Base-Station Antenna Array With Dual Polarization Using Filtering Magnetoelectric Dipole Antenna
17 November 2023 Zhi Jing Xiao, Yun Fei Cao, Jia Sheng Lin, Yu Lan and Quan Xue present a dual-band shared-aperture antenna array using a filtering magnetoelectric (ME) dipole antenna for the application of mobile-communication base station. It is realized by interleaving a lower-band (LB) filtering ME dipole antenna operating from 1.7 to 2.8 GHz and four higher-band (HB) patch antennas in the band of 3.3-3.9 GHz. The filtering performance of the proposed ME dipole antenna is realized by U-shaped slots etched on the radiating arms and a cross-shaped microstrip line inside the aperture of the magnetic dipole, and used to realize a high cross-band isolation.
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On Performance Characterization of Harmonic Transponders
15 November 2023 Milan Polivka and Jeff Frolik show that harmonic transponders’ conversion loss is dependent jointly on interrogation power, interrogation frequency, and interrogation angle. This coupled nature of the device’s behavior necessitates performance metrics that capture these characteristics. They present a methodology to generically test these devices and propose metrics that capture the noted dependencies.
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A Lightweight Spherical Generalized Luneburg Lens Antenna With Low Cross-Polarization Over a Wide Range in Azimuth and Elevation
14 November 2023 Maral Ansari, Oskar Zetterstrom, Nelson J. G. Fonseca, Oscar Quevedo-Teruel and Y. Jay Guo present a novel dual-slant polarized three-dimensional (3D) periodic Luneburg lens with a diameter of 390 mm (4.6λ0 at 3.55 GHz). Copper-plated cubes with truncated corners are placed in a body-centered cubic (BCC) lattice and held together with layers of Rohacell foam. The sizes of the cubes are varied to realize the gradient refractive index (GRIN) profile of a generalized Luneburg lens at a low cost, with a low weight and loss.