Accession Number : ADD013095

Title :   Broadband Multi-Element Antenna.

Descriptive Note : Patent, Filed 13 Jun 83, patented 10 Sep 85,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Munk,Benedikt A ; Larson,Clayton J

Report Date : 10 Sep 1985

Pagination or Media Count : 6

Abstract : A broadband multi-element antenna is presented. The antenna comprises a monopole centrally disposed within a cavity of the body, and a plurality of antenna elements disposed at ninety degree increments about the periphery of the cavity. A plurality of isolation traps are connected between selected pairs of the antenna elements. The isolation traps are half-wavelength transmission lines which permit excitation of the respective plurality of elements by input signals which are of equal amplitude and 180 out-of-phase but are short circuits between the respective pairs for in phase signals parasitically induced from the monopole. Additionally, switching traps are connected to respective ones of the antenna elements. The switching traps comprise quarter-wave transmission lines which are switchable to ground and selectively provide a short circuit of signals at the respective ones of the elements for changing the radiation pattern of the antenna.

Descriptors :   *PATENTS, *ANTENNA COMPONENTS, *BROADBAND ANTENNAS, *RADIATION PATTERNS, *SHORT CIRCUITS, CAVITIES, INPUT, SIGNALS, SWITCHING, TRAPS, AMPLITUDE, ISOLATION

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE