Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1988-05-11
1989-08-01
Hille, Rolf
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343701, 343834, H01Q 926
Patent
active
048537055
ABSTRACT:
The invention relates to an antenna for receiving and modulating transmitted signals having a very low power density on the order of below 1 watt per meter squared, at a selected center frequency above 2,000 MHz. The antenna uses a folded planar dipole section having two separated oppositely disposed U-shape elements, each of said elements having a pair of ends. A capacitor is series-coupled between two of the oppositely disposed ends of the elements, and a diode having a high impedance at the selected center frequency is series-coupled between the other two oppositely disposed ends of the U-shape elements. A metallic backplane is mounted parallel to the planar folded dipole section and spaced from the dipole section a predetermined distance selected to reduce the antenna impedance. The impedance of the diode, the shape of the folded planar diode section and the predetermined amount of spacing of the backplane from the planar folded dipole section are all selected to increase the d.c. power output of the antenna.
REFERENCES:
patent: 2943189 (1960-06-01), Crump
patent: 4207518 (1980-06-01), Hopfer
patent: 4647849 (1987-03-01), Strickland et al.
Amtech Technology Corporation
Hille Rolf
Wimer Michael C.
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