Multiple omnidirectional antenna

US4297707A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Anton Brunner · Starnberg, DE
• Nikolaus Willburger · Olching, DE

Key dates

• Filing date: Jun 4, 1979
• Grant date: Oct 27, 1981
• Expiry date: Jun 4, 1999

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01Q21/30
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A multiple omnidirectional antenna, utilizing individual antennae for different frequencies, and/or different polarizations, disposed along a common axis, and employing a multiple coaxial feed from one side only, in which the omnidirectional antenna which is remote from the feed side, is in the form of an axial wave-guide section, with the portion defining the walls thereof being connected to the outer conductor of the innermost coaxial feed line, and at least, in effect, defining at least one slot therein which runs transversely to the desired polarization direction of such antenna, with the inner conductor of the innermost coaxial feed line forming the exciting element therefor and projecting into the interior of said wave-guide, and/or at least one other omnidirectional antenna in the form of a coaxial line section, the walls of which are connected to the outer conductor of another coaxial feed line, and are provided with at least one slot therein which runs transversely to the desired polarization direction of said antenna, with the inner conductor of such other coaxial line passing through the interior of said coaxial line section. Combinations of horizontal, vertical and circ…