An optimal beamforming strategy is proposed for performing large-field surveys with dual-
polarized phased-array-fed reflector antennas. This strategy uses signal-processing …

Phased arrays have a long history in radio astronomy. Large, sparse synthesis arrays have
been in use for decades to capture high-resolution images of deep space objects. More …

The theory of characteristic modes is a popular physics-based deterministic approach, which
has found several recent applications in the fields of radiator design, electromagnetic …

Embedded element patterns (EEPs) depend on the loads attached to elements in an
antenna array. When modeling antenna arrays, the loading condition used in numerically …

Present day synthesis radio telescopes have limited survey capabilities because of field of
view restrictions. A novel method to form multiple beams on the sky is to employ a phased …

To optimize the design of a high-sensitivity receiver, it is valuable to be able to assign noise
budget contributions to various parts of the system. The system noise and aperture efficiency …

In this article, we present a novel dielectrically loaded quad-ridge flared horn (QRFH) as a
reflector feed with beyond-decade ultrawideband performance. The dielectric is machined in …

For phased arrays used in satellite communications and radio astronomy, high sensitivity is
required, and minimizing antenna losses is critical. Losses for single antennas can be …

Aperture arrays have been studied extensively for application in the next generation of large
radio telescopes for astronomy, requiring extremely low noise performance. Prototype array …

Upgrading the Multi-Frequency-Front-Ends of the Westerbork Synthesis Radio Telescope
(WSRT) by multiple-beam phased array feeds will improve its survey speed by a factor 20 …