We present a technique-led review of the progression of precise radio astrometry, from the
first demonstrations, half a century ago, until to date and into the future. We cover the …

arxiv:1908.05356v2 [astro-ph.IM] 16 Aug 2019 Page 1 Astro2020 Project White Paper The
NANOGrav Program for Gravitational Waves and Fundamental Physics The North American …

In order to meet the requirements of the new generation of radio telescopes, we have
developed a new topology called DYQSA, which stands for DYson Quad-Spiral Array. The …

We present the design, manufacture, and measured performance of a dielectrically loaded
quad-ridge flared horn (QRFH) feed for decade bandwidth radio astronomy application. The …

A longitudinally miniaturized H-plane horn antenna with suppressed sidelobes by
redistributing the field on the radiating aperture is proposed by loading a few rectangular …

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 …

In radio astronomy instrumentation, the benefit of increased spectral grasp must be
evaluated against a decrease in overall system performance (eg, system noise, stability, and …

We describe a new type of ultrawideband feed antenna based on nested coaxial
waveguides. The feed is for radio astronomy applications and covers two closely spaced …

In this communication, the concept of common-mode (CM) resonance is introduced to
analyze radiation anomalies caused by unbalanced coaxial feeding. To address this issue …

We present the design of an ultra-wideband dielectrically loaded Quad-Ridge Flared Horn
(QRFH) feed for the European Very Long Baseline Interferometry Network (EVN) developed …