Short wave transmission method and apparatus therefor
First Claim
1. A short wave transmission apparatus having a transmission apparatus comprising:
- carrier generation means for generating a carrier in a short wave band;
amplification means for amplifying the carrier;
means for dividing the amplified carrier;
a coaxial cable; and
two orthogonal dipole antennas,wherein said dipole antennas are connected to a coaxial cable having a length for delaying a phase to be supplied to one antenna element by π
/2 with respect to that to the other antenna element.
1 Assignment
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Accused Products
Abstract
In a short wave transmission method, a carrier in a short wave band is circularly polarized and radiated from an antenna, thereby removing an influence of fading. A short wave transmission apparatus has a transmission apparatus including a carrier generation unit, a subcarrier generation unit, a first mixer, a phase shifter, a second mixer, and two orthogonal dipole antennas. The carrier generation unit generates a carrier in a short wave band. The subcarrier generation unit generates a subcarrier. The first mixer receives the carrier and the subcarrier. The phase shifter phase-shifts the subcarrier generated from the subcarrier generation unit by π/2. The second mixer receives the carrier and a subcarrier which is phase-shifted by π/2 by the phase shifter.
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Citations
2 Claims
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1. A short wave transmission apparatus having a transmission apparatus comprising:
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carrier generation means for generating a carrier in a short wave band; amplification means for amplifying the carrier; means for dividing the amplified carrier; a coaxial cable; and two orthogonal dipole antennas, wherein said dipole antennas are connected to a coaxial cable having a length for delaying a phase to be supplied to one antenna element by π
/2 with respect to that to the other antenna element.
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2. A short wave transmission apparatus having a transmission apparatus comprising:
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carrier generation means for generating a carrier in a short wave band; amplification means for amplifying the carrier; impedance matching means for outputting the amplified carrier; and a helical antenna, wherein the carrier is input from said impedance matching means to said helical antenna, thereby radiating a circularly polarized wave.
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Specification