Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Patent
1979-03-28
1981-07-14
Lieberman, Eli
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
343867, 455274, H01Q 700
Patent
active
042789800
ABSTRACT:
A low-impedance loop antenna for receiving medium-frequency-band radio waves has an inductance of 1 microhenry up to 100 microhenries and an effective loop area larger than 20 cm.sup.2, whereby it is capable of receiving radio waves with a markedly improved rejection of undersirable radiations in the form of electric field from external noise sources. Such low-impendance loop antenna is coupled to a radio receiver via an input transformer whereat the impedance of this antenna is stepped up for the purpose of impedance matching. The input transformer has a primary winding provided with a tap adapted to be connected to the antenna and whose ends are connected to a variable capacitor constituting a tuning circuit jointly with the input transformer.
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Telefunken, German Published Application, 21a.sup.4, 47.T4354, 7-3-52.
Ogita Minoru
Takeyama Masahiro
Lieberman Eli
Nippon Gakki Seizo Kabushiki Kaisha
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