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This paper presents the latest progress in demonstrating and characterizing the Traveling-Wave Antenna Array (TWAA) as a Multioctave Planar Phased Arrays (MPPA) capable of efficient wide-angle scan over multioctave bandwidth. (Beam Steering Network (BSN) and T/R module are not included here.) Four brass board TWAA panels having 16∗16 array elements were fabricated and tested for wide-angle scan up...
Full-fledged characterization of Traveling-Wave Antenna Array (TWAA) for wide-angle scan up to 60° off broadside over 2–12 GHz was first presented in 2015 IEEE Antenna Symposium by this author. Ironically, in the same Symposium, presentation by Neto and Cavallo stated that no “Connected Array” has yet reached a bandwidth of 2:1 due to poor cross-polarization higher than −10 dB. This paper shows that...
Conventional antenna designs for small platforms have been focused on using high-Q antennas, resulting in narrow bandwidth easily detuned. An approach using low-Q antennas miniaturized by using Real-time Adaptive Tuning (RTAT) is proposed. This new approach has been applied to the development of an Adaptive Miniaturized Ultrawideband Antenna (AMUA). Preliminary results are promising.
Global Navigation Satellite System (GNSS) will in effect be fully deployed and operational in a few years, even with the delays in Galileo as a consequence of European Union's financial difficulties. The vastly broadened GNSS spectra, spread densely across 1146–1616 MHz, versus the narrow Global Positioning System (GPS) L1 and L2 bands, together with a constellation of over 100 Medium Earth Orbit...
This paper discusses the theory of antenna radiation from the viewpoint of radiation integrals, from which it is shown how the fundamental physical limitation on antenna gain bandwidth and phased arrays is circumvented. In particular, the traveling-wave (TW) antenna is shown to be miniaturized or broadbanded by techniques such as the use of metamaterial and the slow-wave.
This paper discusses latest design of broadband planar Traveling-Wave Array (TWA), a class of broadband planar phased array antennas using planar 2-dimensional (2-D) broadband traveling-wave antenna elements closely spaced above a conducting ground plane, for low cost and multioctave bandwidth. The TWA is fundamentally different from the other two 2-D broadband phased arrays: Current Sheet Antenna...
This paper discusses a latest design of broadband planar Traveling-Wave Array (TWA). The TWA is a class of planar phased array antennas using planar 2-dimensional (2-D) broadband traveling-wave antenna elements closely spaced above a conducting ground plane. To suppress grating lobes, array elements are densely packed, and adjacent elements are strongly coupled to facilitate continuous propagation...
The conventional wisdom of an ideal omnidirectional antenna is an old academic idea, which is not practical nor useful in most mobile environments, as is well known to practicing engineers in wireless telecommunications. In the past five years, a wide variety of data compression, modulation and coding schemes have led to larger bit errors in wireless signals, while the communications environments...
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