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Proceedings Paper

Design and system applications of a 61-GHz dual-beam flat antenna with grating structures on a dielectric waveguide
Author(s): Zong-Wen Li; Wolfgang Menzel
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Paper Abstract

According to Floquet's Theorem and Brillouin Principle, a two beam radiation antenna based on inverted strip dielectric waveguide (ISDG) with grating structures for both dielectric grating and metallic strip grating is investigated and tested. The radiation characteristics of a 61 GHz dual-beam flat antenna with symmetry in respect to the broadside direction are plotted. The beamwidths of 4.5 degree(s) and 18.5 degree(s) in E-plane and H-plane are observed, respectively. Millimeter Wave dual-beam flat antennas will be of potentially wide applications, such as aircraft, tracking radar, collision avoidance, car navigation system and true ground speed information with a required high accuracy and rejection the measurement error. The FMCW Doppler Systems using single- and dual-beam antenna at 61 and 40 GHz have been constructed with high sensitivity. The millimeter wave integrated front ents are connected with the dual-side-band heterodyne receiver and the Digital Signal Processing (DSP) system of a Fast Fourier Transform (FFT) frequency analyzer and the two sidebands separation circuits. The direction of flying aircraft to be inclined toward can be corrected by dual-beam system. The true ground speed of the vehicle can be measured exactly by it also, when the vehicle has the vertical component of movement speed. The Doppler direction of the target can be discriminated immediately with the single-beam system. For extremely low costs by very simple MMW system using two mixer diodes and a 3 db hybrid at the Doppler frequency, the Doppler direction can be discriminated also.

Paper Details

Date Published: 19 August 1994
PDF: 14 pages
Proc. SPIE 2211, Millimeter and Submillimeter Waves, (19 August 1994); doi: 10.1117/12.182997
Show Author Affiliations
Zong-Wen Li, Southeast Univ. (China)
Wolfgang Menzel, Univ. Ulm (Germany)

Published in SPIE Proceedings Vol. 2211:
Millimeter and Submillimeter Waves
Mohammed N. Afsar, Editor(s)

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