During the past few years, research covering propagation, channel characterization, and wireless system performance has yield a substantial knowledge of the 60 GHz channel. The unlicensed 60 GHz frequency band presents many attractive properties for wireless communications. This paper addresses some wideband propagation characteristics for broadband wireless LANs (BWLANs). Important system-desi...

In indoor wireless communications systems, the antenna radiation patterns at the transmitter and the receiver have a significant influence on the channel characteristics. The work reported in this paper give insight about a new approach for modeling the effects of the radiation patterns of the directional horn antenna. The propagation modeling of the indoor multipath channel is based on the ray...

The TUD Synthetic Aperture Radiometer demonstration model consists of a 2-channel X-band correlation radiometer with two horn antennas and an antenna mounting structure enabling the horns to be mounted in relevant positions within a certain aperture. The cross correlation of the signals from the 2 antennas produces a sample of the visibility function, which is the Fourier transform of the brigh...

The performance of a cellular phone commercial helical antenna at 900 MHz band, both in free space and in the presence of a human head phantom was studied. Numerical simulation of the phone model for the latter case has been performed giving 3D radiation diagrams. The effect of the phantom head on radiation diagrams is presented. The relative amount of the EM power absorbed in the head was obta...

In this paper, a Ka/K-band antenna-feeding network in dual-circular polarization is reported. The design of the system was carried out view its monolithic manufacturing through selective laser melting AlSi10Mg alloy. As proof-of-concept for satellite telecommunication multi-beam applications, feeding operates K band (19.25, 20.75) GHz and Ka (27.0, 29.0) GHz. provides four rectangular-waveguide...

Extremely sensitive detectors are necessary for deep full-sky survey of distant extragalactic sources in the submillimeter-wave region by the cryogenically cooled telescope at the International Space Station (project Submillimetron). Detection of faint sources needs wide-band continuum observation using direct detectors (bolometers) not restricted by the quantum noise of indirect heterodyne rec...

Radiative hyperthermia is a clinically applied cancer treatment modality where antenna design crucial to achieving therapeutic goals. Serving as the building block of phased-array configuration, antennas are typically arranged in cylindrical or elliptical array called applicator. This short communication proposes an phased applicator based on compact, UWB from category double-ridged horn custom...

A two-dimensional (2D) diffraction model for the calculation of the diffraction field in 2D space and its applications to terahertz parallel-plate waveguide power splitters are proposed in this paper. Compared with the Huygens-Fresnel principle in three-dimensional (3D) space, the proposed model provides an approximate analytical expression to calculate the diffraction field in 2D space. The di...

This article presents a novel 3-D-printed, pyramidal double-ridged horn antenna, filled with high-dielectric material comprising mixture of linseed oil and titanium oxide, for biomedical applications. In particular, this investigation explores the use antenna design to measure abdominal fat layers human body. The is designed operate at low-frequency microwave bands complemented an absorber laye...

This communication presents a vertically stacked substrate-integrated waveguide (SIW) antenna array that enables different configurations with the minimum number of SIW layers. achievement lies in modular feature offered by proposed design. Specifically, four distinct can be produced only three designs Depending on layers employed antenna, directivity E-plane is modified. To obtain an equal and...