Accession Number : AD0648850

Title :   ANTENNA RESEARCH.

Descriptive Note : Scientific rept. no. 1, 1 May 66-31 Jan 67,

Corporate Author : TECHNISCHE HOCHSCHULE MUNICH (WEST GERMANY) INSTITUT FUER HOCHFREQUENZTECHNIK

Personal Author(s) : Meinke,H. H.

Report Date : 01 FEB 1966

Pagination or Media Count : 94

Abstract : A study was made of electrically small antennas with top capacity and a transistor circuit between the top capacity and the main rod of the radiator. We find broadband characteristics, semi-directivity, good matching to standard output cables and the possibility to vary the antenna characteristics by changing the bias of the transistors were found. The noise of such antennas was measured. Extended measurements were made on plane Archimedean spiral antennas to improve the knowledge of antenna currents and nearfield. Measurements on the backing cavity resonances led to the development of lossy foils to avoid unwanted resonances within the cavity. It was demonstrated that lossy foils improved the radiation patterns and the broadband matching of the input impedance at the resonance frequencies of the cavity. (Author)

Descriptors :   (*ANTENNAS, PERFORMANCE(ENGINEERING)), SPIRAL ANTENNAS, BROADBAND, IMPEDANCE MATCHING, TRANSISTORS, ANTENNA RADIATION PATTERNS, RESONANT FREQUENCY, CAVITY RESONATORS, ELECTRICAL IMPEDANCE

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE