Circularly polarized U-Slot antenna

Circularly polarized single-layer U-slot microstrip patch antenna has been proposed. The suggested asymmetrical U-slot can generate the two orthogonal modes for circular polarization without chamfering any corner of the probe-fed square patch microstrip antenna. A parametric study has been carried out to investigate the effects caused by different arm lengths of the U-slot. The thickness of the foam substrate is about 8.5% of the wavelength at the operating frequency. The 3 dB axial ratio bandwidth of the antenna is 4%. Both experimental and theoretical results of the antenna have been presented and discussed

Benzodiazepine withdrawal seizures in a Chinese lady

published_or_final_versio

Bayesian models for tourism demand forecasting

Author name used in this publication: Kevin K. F. WongAuthor name used in this publication: Kaye S. Chon2005-2006 > Academic research: refereed > Publication in refereed journalAccepted ManuscriptPublishe

A semiparametric cure model for interval-censored data

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Retroperitoneal schwannoma: A common tumour in an uncommon site

We describe a female adult patient who presented with acute retention of urine and vague abdominal discomfort. A provisional diagnosis of ovarian tumour was made after crosssectional imaging. At laparotomy a very large retroperitoneal mass was biopsied and found to be a schwannoma after pathological examination. The clinical, radiological, and pathological features of this disease are discussed in this report.published_or_final_versio

Reconfigurable Surface Wave Fluid Antenna for Spatial MIMO Applications

This paper presents the design of a surface wave fluid antenna which can realizes beamshaping and spatial diversity for MIMO applications. The proposed design only required one RF input to achieve spatial diversity when comparing to the conventional multiple RF input ports approaches. The surface wave fluid antenna is designed for the millimeter-wave 5G mobile communications band from 24 to 28 GHz. The simulation results show that the radiation direction of the antenna can be controlled by changing the position of the fluid metal radiator

Miniaturized Via-Free Magneto-Electric Dipole Antenna Fed by Substrate Integrated Coaxial Line on Reactive Impedance Surface

A wideband via-free magneto-electric (ME) dipole antenna is conceived for millimeter wave band applications. Herein, the electric dipole patch and a half-wavelength radiating slot are excited in phase on the patch layer by a substrate integrated coaxial line (SICL) to fulfill the complementary conditions as a ME dipole. The proposed antenna omits the deployment of the vertically oriented shorted patch, which relieves the typical quarter-wavelength height constraint and fabrication complexity of the conventional ME dipole antennas. The antenna is further loaded with the capacitive reactive impedance surface (RIS) to achieve size miniaturization and bandwidth enhancement. The finalized dimension (excluding the RIS) is 0.36 λ0 × 0.48 λ0 × 0.13 λ0, where λ0 denotes the wavelength in free-space at the center frequency. A wide impedance bandwidth of 64.8% (17.1 GHz - 33.5 GHz) is achieved for SWR ≤ 2, in which the antenna gain varies from 5.9 dBi to 8.8 dBi. Besides, a consistent unidirectional radiation pattern can be observed across the operating frequency band. In the sequel, the same antenna is aggregated into an 8-element linear array which is fed by a designated 8-way SICL network. Finally, an active simulation has been performed to verify the ability of the array in beam scanning

Enhancing and Localizing Surface Wave Propagation with Reconfigurable Surfaces

As an attempt to develop a reconfigurable surface architecture that can use liquid metal such as Galinstan to shape surface channels on demand, this paper considers a punctured surface where cavities are evenly distributed and can be filled with liquid metal potentially via digitally controlled pumps. In this paper, we look at the benefits of such architecture in terms of surface-wave signal enhancement and isolation, and examine how various system parameters impact the performance using full wave 3-dimensional electromagnetic simulations. It is shown that extraordinary signal shaping can be obtained