A geomagnetic storm on Jan. 20 triggered unexpected F2 propagation, allowing VHF DXers in North America to receive TV signals from as far away as Colombia.
Air Traffic Controllers use Automatic Dependent Surveillance-Broadcast (ADS-B) as an alternative to secondary radar to track aircraft. The ADS-B is transmitted by the aircraft and contains information ...
Abstract: This paper studied the application of wideband, miniaturization of VHF/UHF airborne antenna, an airborne bow-tie antenna with reflecting cavity is designed. The bent bowtie antenna is used ...
Abstract: This article presents the miniaturization of a planar monopole antenna at the VHF band through the use of low loss Magneto-Dielectric Materials (MDM). By proposing a folded structure of the ...
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