Microwave transmission device with multimode diversity combined reception

US4473828A · kind A · utility

Assignee

• Licentia Patent-Verwaltungs-GmbH · DE

Inventors

• Gunter Morz · Ludwigsburg, DE
• Klaus Rademacher · Backnang, DE

Key dates

• Filing date: Mar 24, 1982
• Grant date: Sep 25, 1984
• Expiry date: Mar 24, 2002

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01Q25/04
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A microwave transmission system for multipath propagation operating according to the angle diversity principle and comprising a transmitting and receiving device including a reflector antenna and a waveguide exciter horn wherein a fundamental mode and modes of a higher order can propagate, a mode coupler following the exciter horn for separating the energy components of the main mode and the higher order modes, and receiving and combining devices for obtaining the best signal from the received energy components of the various modes. The exciter horn is dimensioned so that at least two independent modes of a higher order or combinations thereof having the same polarization as the main mode can be excited in the waveguide exciter horn in addition to the main mode. In order to enlarge the radiation gain of the antenna, the waveguide exciter horn is designed, in its basic structure as well as by means of additional structural elements, such as pairs of apertures, corrugated structures, steps and bends, such that the aperture angle (.alpha.) of the radiation lobe of the main mode is matched to the aperture angle (.beta.) of the radiation lobes of the higher modes or vice versa in the pl…