Showing papers on "Active antenna published in 1982"
TL;DR: A study of pertinent noise figure and available power gain equations shows that performance is strongly influenced by antenna resistance.
Abstract: Many amplifier designs have been proposed for use with electrically small antennas in receiving applications. A study of pertinent noise figure and available power gain equations shows that performance is strongly influenced by antenna resistance. Low values of antenna resistance limit noise performance, and a study of antenna Q shows that only a limited increase in resistance can occur.
11 citations
01 Feb 1982
TL;DR: In this paper, a balanced active antenna and an impulse noise blanker were used to reduce the detrimental effects of negative-corona generated impulse noise on Raydist T radio navigation equipment.
Abstract: : Erratic operation of Raydist T radio navigation equipment aboard mine countermeasures helicopters has been traced to fuselage-tow cable interactions with the Raydist receiving antenna and to negative-corona generated impulse noise. The development of a balanced active antenna and an impulse noise blanker which have proved successful in reducing these detrimental effects are described. The final system is described in detail and the results of laboratory tests are presented (Author).
1 citations
Patent•
07 Jun 1982
TL;DR: In this paper, an electronically controlled antenna which outputs a large electric power transmission signal easily by amplifying the transmission signal with a high output microwave semiconductor amplifier between the 1st and 2nd circulators was obtained.
Abstract: PURPOSE:To obtain an electronically controlled antenna which outputs a large electric power transmission signal easily by amplifying the transmission sigal to a large electric power with a high output microwave semiconductor amplifier between the 1st and 2nd circulators. CONSTITUTION:The transmission signals distributed equally with the 2nd hybrids 2, and 3 are not applied directly to power feed circuits 41- and are amplified to large electric power by high output microwave semiconductor amplifiers 61- installed between the 1st, 2nd circulators 51- and 71-, then they are applied to the circuits 41-. Large electric power transmission signals are easily generated from active antenna elements 81- requiring no increase in amplification stage. Since the reception signals are transmitted from the circulators 71- to the circulators 51- by bypassing the amplifiers 64-, deterioration is prevented.