Double-shell modified extended hemispherical lens feed for reflectors in scanning applications (original) (raw)

2011, European Conference on Antennas and Propagation

A new dielectric lens antenna configuration is described, intended to feed a quasi-optical imaging reflector system. The lens is fed at its base by a 5 pixel array, each one producing an output beam after the reflector with near 61 dBi directivity. The lens is designed in such a way that it produces virtual foci outside the lens body, close to the reflector focal arch. The lens plus reflector system provides a maximum scanning angle of α = ±0.36º in elevation with gain scan loss below 1.1dB, while a mechanical rotation of the reflector produces azimuth scan.

Focal-Plane Multibeam Dual-Band Dielectric Lens for Ka-Band

2017

A shaped double-shell dielectric lens is evaluated as a primary feed for a multibeam single-reflector system operating in the satellite uplink and downlink Ka-bands, complying with gain and edge-of-coverage (EoC) directivity requirements. An assembly of dual-band printed feeds is integrated at the base of a single lens, each feed producing a virtual focus far behind the lens base and coincident with the reflector focal arch. The used double-shell lens approach, instead of a single-material lens, allows an extra degree of freedom to accommodate an aberration mitigation condition. This primary feed system is proposed as a low-complexity solution to enable fitting more beams per solid angle than conventional single-feed-per-beam systems based on a cluster of focal-plane horns. A proof-of-concept lens prototype with 87 mm diameter and 62 mm height, fed by a linear arrangement of five dual-band printed feeds, was fabricated and tested at the Ka-band. The lens measured radiation patterns were post-processed to evaluate the combined performance of the lens with an offset F/D 1 reflector system designed for 45-dBi EoC directivity. It is shown that it duplicates the reflector aperture efficiency compared to horn-fed systems with same feed separation. Index Terms—Dual-band antenna, multibeam antennas, reflector antennas, shaped double shell-lens antenna.

Integrated Lens Antennas

Aperture Antennas for Millimeter and Sub-Millimeter Wave Applications, 2017

This chapter presents the Integrated Lens Antenna (ILA) technology as it evolved since its introduction aiming to respond to the needs of emerging applications such as high-data-rate communication, intelligent transport, and mm-wave imaging. The topics covered include the ILA design concepts as well as the electromagnetic phenomena intrinsic to dielectric lenses that may affect ILA performance. The aspects of the ILA technology related to selection of the primary feeds, lens materials, and fabrication methods are also revised. A few practical examples are provided to illustrate the current and future trends of this technology.

Broadband Integrated Lens for Illuminating Reflector Antenna with Constant Aperture Efficiency

This paper presents a new integrated shaped lens antenna configuration with frequency stable radiation pattern and phase center position across a broad 1:3 frequency band, which can be used for focal plane reflector feeding in quasi-optical radio telescope systems. The lens is compatible with the integration of ultra-wideband uniplanar printed feeds at its base and equally broadband mixing devices, like the Hot Electron Bolometer (HEB), although these are not used in the present work. Measurements on a scaled mm-wave lab prototype have confirmed stable performance versus frequency, with only ±1dB directivity variation, and better than 94% Gaussicity, thanks to the possibility to impose a predefined output radiation pattern template. Simulations were performed to test the illumination of an off-set parabolic reflector by the lens radiation pattern, which confirmed reasonably constant aperture efficiency in the order of 78% across the 100% bandwidth.

Review of 20 Years of Research on Microwave and Millimeter-wave Lenses at “Instituto de Telecomunicações”

2005

Starting from a challenge in the early 1990s to develop a highly shaped beam dielectric lens antenna for a pilot 150 Mb/s cellular mobile broadband system operating in the 60-GHz band, several new developments have been accomplished over more than 20 years at Instituto de Telecomunicações [1] in the areas of millimeter-wave shaped dielectric lens antennas and planar metamaterial lenses. We review here a few representative examples with numerical and experimental results, covering applications in mobile broadband communications, radiometry, satellite communications, multigigabit short-range communications, and sublambda near-field target detection.

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