IEEE Open Journal of Antennas and Propagation - OJAP

[Sub-THz Conformal Lens Integrated WR3.4 Antenna for High-Gain Beam-Steering] Akanksha Bhutani, Joel Dittmer,?Luca Valenziano?and?Thomas Zwick the first conformal lens-integrated rectangular waveguide antenna that achieves high-gain beam-steering in the sub-THz range of 230 GHz to 330 GHz, to the best of the authors’ knowledge. The antenna consists of a 2×32 array of elliptical slots (E-slots) fed by a standard WR3.4 rectangular waveguide, ensuring that the antenna operates in its dominant TE10 mode. The E-slots are spaced by less than half of the guided wavelength, which causes them to be fed with a constant phase difference, thus leading to a progressive phase shift along the antenna aperture. Consequently, the antenna main lobe steers from -71° to -16° as the operating frequency varies from 230 GHz to 330 GHz, respectively. Read their article here: https://lnkd.in/gj9v-8dj #Antennas #Lenses #RectangularWaveguides #AntennaArrays #Bandwidth #WirelessCommunication #Standards?#APS #IEEE #OJAP

[Analysis and Design of Planar Surface Wave Lenses and Application to Leaky-Wave Antennas] Maksim Kuznetcov , Davide Comite, Symon K. Podilchak, Alois Freundorfer and Yahia Antar present planar metasurface lens structures based on microstrip technology, optimized to control the propagation of surface waves (SWs). Two different lenses are studied, i.e., a converging or plane-wave-like lens and a diverging lens. Near-field simulations and measurements are reported to demonstrate the guiding features of the designed lenses, which have also been proposed as a feeding system for planar leaky-wave antennas (LWAs). Far-field results show improvements in terms of reduced cross polarization and sidelobe level as well as increased realized gain when compared without these SW lenses. Read their article here: https://lnkd.in/g4SSZmyn #Lenses #SurfaceWaves #Metasurfaces #Microstrip #MicrostripAntennaArrays #SurfaceImpedance #Dielectrics?#APS #IEEE #OJAP

[State of the Art on Advancements in Wireless Capsule Endoscopy Telemetry: A Systematic Approach] Sara Fontana, Simona D’Agostino, Alessandra Paffi, Paolo Marracino, Marco Balucani, giancarlo ruocco, Salvatore Maria Aglioti, Francesca Apollonio and Micaela Liberti prepare this systematic review according to PRISMA guidelines focuses on the main technological advances of data transmission from the in-body ingestible capsule to an external receiver in Wireless Capsule Endoscopy (WCE). A total of 142 studies were screened from a comprehensive literature search, performed in Scopus, Science Direct, and IEEE Xplore database. A final number of 47 met the inclusion criteria and were included in the review. The results highlight innovative technologies to optimize the wireless link efficacy and safety to an external receiver. High gain, wideband, omnidirectional radiation pattern, and low levels of specific absorption rate (SAR) are of crucial importance. Read their article here:?https://lnkd.in/g9VuqAUG #TemperatureMeasurement #Endoscopes #ImageSampling #WirelessCommunication #MedicalDiagnosticImaging #AntennasAndPropagation #Reviews #APS #IEEE #OJAP

[Sub-GHz Wrist-Worn Antennas for Wireless Sensing Applications: A Review] Sanjeev Kumar, Gholamhosein Moloudian, Roy B. V. B. Simorangkir, Dinesh R. Gawade, Brendan O'Flynn and John L. Buckley review wrist-worn Sub-GHz antennas reported in the literature, analyzing key antenna parameters such as antenna topology, size, impedance bandwidth, peak realized gain, radiation efficiency, and specific absorption rate (SAR). Additionally, it underlines antenna design challenges, limitations, current trends, and presents potential future perspectives. This paper is featured in the Special Section on Antenna-Enabled Sensors and Systems Read their article here: https://lnkd.in/gqqi_aXH #Antennas #WirelessSensorNetworks #WirelessCommunication #Sensors #CommunicationSystemSecurity #BiomedicalMonitoring #Reviews #APS #IEEE #OJAP

[Modeling and Characterization of Electrically Small Ultrawideband Antenna for Headstage-Based Wireless Neural Signal Recording System] Adnan Basir Patwary, Nishanth Virushabadoss, Rashaunda Henderson and Ifana Mahbub use microsystems that record neural signals collected simultaneously after neural simulation in the diagnosis of neural diseases. They propose a 15× 15 mm2 slot antenna with a 50 Ω microstrip excitation line. The slot antenna is created by the addition of slots in the ground plane which is a common miniaturization method as it results in ultrawideband operating frequency. A lumped component-based model along with a 3D EM model of the modified SMA connector used for the measurement and headstage model is also developed to observe the effect on the antenna performance. This paper is featured in the Special Section on Antenna-Enabled Sensors and Systems Read their article here: https://lnkd.in/gCFvkyM3 #UltraWidebandAntennas #TransmittingAntennas #SlotAntennas #AntennaMeasurements #AntennaRadiationPatterns #Recording #IntegratedCircuitModeling #APS #IEEE #OJAP

[Frequency-Diverse Reflection Metasurface Antenna Design for Computational Microwave Imaging] Aobo Li, Mengran Zhao, Dónal Patrick Lynch, Shitao Zhu, Muhammad Ali Babar Abbasi and Okan Yurduseven propose the design of a computational microwave imaging (CMI) oriented frequency-diverse reflection metasurface antenna (FDRMA). Designing a FDRMA for CMI requires a careful synthesis framework, from the topology of metamaterial elements to the statistical analyses of the metasurface and the evaluation of its CMI performance. Consequently, they begin with an investigation of different metamaterial element topologies with the aim to choose the optimal one to constitute a desired reflection metasurface. The FDRMA is then designed by randomly distributing the metamaterial elements with diverse structural parameters. The orthogonality of the reflected field patterns is investigated by means of a spatial-correlation evaluation and a singular value decomposition. This paper is featured in the Special Section on Antenna-Enabled Sensors and Systems Read their article here: https://lnkd.in/gn9RN_mG #Topology #Reflection #Metamaterials #Metasurfaces #MicrowaveImaging #MicrowaveAntennas #MicrowaveTheoryandTechniques #APS #IEEE #OJAP

[Adaptive Radio Frequency Sensor Enabled by Electromechanically Controlled Stretchable Rectifying Antenna Systems] Zebin Zhu, Bingyang Li, Yajiao Ke, Yuchao Wang, Zequn Wang, Shihao Sun, Ping Lu, Furong Yang, Chaoyun Song, Hongxing Dong, Long Zhang and Cheng Zhang propose a low-cost, substantially simplified solution utilizing a stretchable rectenna, a microcontroller unit (MCU), and feedback control systems to overcome the high costs of high-performance spectrum analyzers and RF signal analyzers in radio frequency detection or ambient spectrum sensing. By exploiting the dynamic correlation between the resonant frequency and the tensile ratio of the stretchable antenna, the incoming frequency can be determined by recording the maximum rectifier DC power output as a function of the electromechanically controlled tension ratio of the stretchable antenna. This paper is featured in the Special Section on Antenna-Enabled Sensors and Systems Read their article here: https://lnkd.in/gvkwUesv #FrequencyMeasurement #AntennaMeasurements #DipoleAntennas #Rectennas #Antennas #Rectifiers #Impedance #APS #IEEE #OJAP

[Ascertaining Operating Points of Harmonic Transponders Using Intermodulation Responses] Jeff Frolik, Elsie Eyram Anthonio, Rye Fought and Tara Harte propose leveraging the harmonic transponders’ nonlinearity by interrogating with two closely spaced signals and then measuring the second harmonics and nearby second and fourth intermodulation distortion products. The results show that it is able to remotely determine the power incident at the device, over a 25 dB range and within ±1 dB, using only the relative ratios between these received components. This result has applications in characterizing the loss of unknown channels and in conducting over-the-air characterization of fully integrated transponders. This paper is featured in the Special Section on Antenna-Enabled Sensors and Systems Read their article here: https://lnkd.in/guvbtktP #HarmonicAnalysis #Transponders #FrequencyMeasurement #PowerSystemHarmonics #DistortionMeasurement #PowerMeasurement #Testing #APS #IEEE #OJAP

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[Low-Cost Indoor Localization Using Dual-Chip RFID Tag] Jawad Ali, Kamol Kaemarungsi, Thipamas Phakaew, Muhammad Uzair, Adam Narbudowicz and Suramate Chalermwisutkul propose a low-cost dual-chip RFID tag antenna for indoor localization. The antenna integrates two RFID chips, each generating opposing radiation patterns. Angle-of-arrival based localization is performed with a single reader by analyzing the Received Signal Strength Indicator (RSSI) and the RSSI ratio of both chips. The antenna incorporates a mechanically adjustable reflector at the back that allows simple beam elevation control to tune the antenna for different indoor environments. The proposed dual-chip tag was measured in an indoor environment with different beam configurations. This paper is featured in the Special Section on Antenna-Enabled Sensors and Systems Read their article here: https://lnkd.in/gAfeMBJT #LocationAwareness #DipoleAntennas #ReflectorAntennas #RFIDTags #Impedance #AntennaMeasurements #Visualization #APS #IEEE #OJAP