This paper presents a new design for wideband circularly polarized (CP) spiral antenna array fed by differential aperture coupling. The excitation is realized two vias located at the lateral sides of transverse slot etched on lower substrate. proposed two-arm has smaller size compared to conventional antennas with several turns. presented single radiating element provides impedance bandwidth (|...

A broadband and compact size circularly polarized (CP) two-port multiple input output (MIMO) antenna with a footprint of 25 mm $\times20$ is investigated. The designed oval-shaped MIMO employs concentric rings oval slots (CROS), along...

This article presents the design of wide-band, ultra-thin, and multi-purpose polarization converter utilizing metasurface for C-, X-, Ku-band applications. Having a topology on FR-4 substrate with metallic patterns front an all-metallic surface finish back, unit cell has symmetry in x−y plane unique features having both linear (LP) circular (CP) property. While conversion ratio (PCR) normal inc...

In this paper, we proposed a multi-beam dual-circularly polarized (dual-CP) reflect-array (RA) antenna for Ka-band application. Two reflection beams fed by the right-handed (RH) CP horn point to $\theta _{\mathrm {R}}=3.5^{\circ }$ an...

This paper presents a novel design of wideband circular polarization 2 × microstrip antenna array working at Ka-band frequencies, from 27.5 to 31 GHz. module is highly integrable with new silicon beamformer chips, creating unit cell that can be part large electronically steerable for compact, ultra-low-profile, Satcom-on-the-move (SOTM) platforms. A multi-layer structure fabricated in standard ...

Global Navigation Satellite System reflectometry (GNSS-R) has recently drawn significant attention since it can be employed in a range of applications including sea state, ocean altimetry, soil moisture measurement, and disaster (e.g. flooding, bushfire, and earthquake) monitoring. Although research on GNSS-R in the past two decades has made advances, there are no (or few) real applications of ...

It is well known that multipath effect remains a dominant error source that affects the positioning accuracy of Global Navigation Satellite System (GNSS) receivers. Significant efforts have been made by researchers and receiver manufacturers to mitigate multipath error in the past decades. Recently, a multipath mitigation technique using dual-polarization antennas has become a research hotspot ...

Parallel factor analysis (PARAFAC) was used to analyze data from the high throughput screening of an array of organometallic rhodium and iridium complexes as catalysts for the intramolecular hydroamination of 2-(2-phenylethynyl)aniline to give 2-phenylindole. The progress of the hydroamination reactions was monitored using UV-visible spectroscopy. The overlapped UV-visible spectra of the mixtur...

Global Positioning System (GPS), is a space-based radio navigation system, consisting of 24 satellites and ground support. GPS provides users with accurate information about their position and velocity, as well as the time, anywhere in the world and in all weather conditions. GPS was initiated in 1973. It is now the heart of modern day navigation systems. GPS became attractive to a broad spectr...