In this communication, we present a new optimization and realization of a quadruple-ridge
flared horn (QRFH) as a feed for reflector antennas of the square kilometer array (SKA) …

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 …

The fundamental limits of the microwave noise performance of high electron-mobility
transistors (HEMTs) are of scientific and practical interest for applications in radio astronomy …

In this letter, design and performance of a dual-polarized quad-ridge horn (QRH) operating
over 3: 1 bandwidth are discussed. In the proposed configuration, the QRH is loaded with a …

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 …

We report the on-wafer characterization of S-parameters and microwave noise temperature
() of discrete metamorphic InGaAs high electron mobility transistors (mHEMTs) at 40 and …

This communication proposes a compact, high performance, quadruple-ridged flared horn
operating from 8 to 50 GHz. A prototype fed by two coaxial connectors has been designed …

This letter proposes a new ridged horn antenna with adjustable metallic grid sidewalls and a
cross-shaped back cavity. An improved design of the coaxial-line-to-ridged-waveguide …

Cryogenic low-noise amplifiers based on high electron mobility transistors (HEMTs) are
widely used in applications such as radio astronomy, deep space communications, and …

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 …