Design of Compact Dual-Polarized 1.2–10 GHz Eleven Feed for Decade Bandwidth Radio Telescopes

Abstract

The Eleven antenna is a log-periodic folded-dipolepair array with two unique radiation characteristics: a constant beamwidth and a fixed phase center location over a decade bandwidth. This paper presents a new compact design of a 1.2-10 GHz Eleven antenna, as a feed for reflector antennas by rearranging the geometry of the outermost elements of the antenna. Due to the compact size, it is possible to put the whole feed system inside a compact cryostat and cool it down to cryogenic temperatures, in order to reduce the system noise temperature in radio telescope applications. The new compact Eleven feed has only a 40% volume of the original standard Eleven feed with a very similar performance. This reduces the capacity requirement for the cryogenic cooling system significantly and therefore the power consumption for future radio telescopes, such as the square kilometer array (SKA). The concept behind this compact design is analyzed in the paper. Simulations and measurements presented here have verified the design.

Optimization of the 0.35–1.05 GHz Quad-Ridged Flared Horn and Eleven feeds for the Square Kilometer Array baseline design

“…In this paper, the initial optimization results for the feeds designed to operate at the lowest frequencies of the SKA1-mid (350 -1050 MHz) are presented and discussed. This study covers two distinct types of WBSPFs which have reached a reasonable level of technological readiness: (i) Eleven antenna and (ii) Quadruple-Ridged Flared Horn (QRFH) [4], [5]. The Eleven antenna represents an antenna array consisting of four log-periodic dual-dipole petals, and its advantageous properties include a nearly constant beamwidth (⇠ 120 at 10dB level), a fixed phase center location, low relative cross-polarization and a very compact low-profile geometry.…”

The Circular Eleven Antenna: A New Decade-Bandwidth Feed for Reflector Antennas With High Aperture Efficiency

“…Based on our experience of mechanical and cryogenic designs in the previous Eleven feed projects [13], [28], microstrip laminated circuit boards, with good thermal and mechanical properties for cryogenic operation, are used for both the antenna petals and center feeding circuit.…”

A Compact UWB Indoor and Through-Wall Radar with Precise Ranging and Tracking

“…The self-grounded Bow-Tie (SGBT) antenna, shown in Figure 1, is a new type of UWB antenna, developed recently at Chalmers University of Technology [7,8]. Several other types of UWB antennas have been also developed at Chalmers for different applications [9][10][11][12].…”