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 …

A novel wideband circularly polarized (CP) horn antenna with a pair of twisted ridges is
investigated in this communication. The wide impedance bandwidth is obtained by adapting …

Antenna noise temperature calculation for a reflector antenna system can be a
computationally expensive operation if the structure is electrically large. Several …

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 …

The accuracy of geodetic Very Long Baseline Interferometry (VLBI) is affected by water
vapour in the atmosphere in terms of variations in the signal propagation delay at the …

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 …

Additive manufacturing enabled wideband, dual-polarized antenna operating from 36 to 90
GHz is proposed. This highly modular configuration is comprised of a quad-ridge horn …

This communication presents a novel quad-ridged horn (QRH) antenna incorporating a
balanced feed. A cross-shaped fusiform structure is mounted in the center of the QRH. The …

This article presents a dual-polarized corrugated horn antenna incorporated a turnstile
orthomode transducer (OMT) covering the full K a-band (26.5–40 GHz). A three-stepped …

This letter presents a dual-polarization inverted quad-ridged flared horn antenna with an
extremely wideband of more than one decade in the range of 2–20 GHz. The modes of the …