Wireless monitoring system and child station therefor
First Claim
1. A wireless monitoring system using a base station and a child station, comprising:
- said base station including;
a base-station transmitting antenna for transmitting an electric power supplying carrier and a signal transmitting carrier to said child station; and
a base-station receiving antenna for receiving an output from said child station;
said child station including;
a child-station receiving antenna which comprises a balanced antenna;
a nonlinear circuit that receives an output from said child-station receiving antenna;
a smoothing circuit that receives an output from said nonlinear circuit;
a first high-frequency band-pass filter, a pass band of said first high-frequency band-pass filter comprising a frequency of said electric power supplying carrier;
an intermediate-frequency band-pass filter, a pass band of said intermediate-frequency band-pass filter comprising an intermediate frequency which comprises a differential frequency between said electric power supplying carrier and said signal transmitting carrier;
a demodulator that receives an output from said intermediate-frequency band-pass filter and uses an output from said smoothing circuit as a power source, a baseband circuit that modifies a baseband signal using an output from said demodulator;
a modulator for modulating a high frequency signal outputted from said first high-frequency band-pass filter by using said baseband signal; and
a child-station transmitting antenna for radiating an output from said modulator, wherein said base-station transmitting antenna and said child-station receiving antenna comprise circularly-polarized antennas which have a same rotating direction, and said child-station transmitting antenna and said base-station receiving antenna comprise circularly-polarized antennas which have a polarization characteristic rotating in a direction opposite to said base-station transmitting antenna and said child-station receiving antenna.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless monitoring system using a base station and a child station, includes the base station including a base-station transmitting and a base-station receiving antenna, and the child station including a child-station receiving antenna, a nonlinear, a smoothing circuit, a first high-frequency band-pass filter, an intermediate-frequency band-pass filter, a demodulator, a baseband, a modulator, and a child-station transmitting antenna. The base-station transmitting antenna and the child-station receiving antenna include circularly-polarized antennas which have a same rotating direction, and the child-station transmitting antenna and the base-station receiving antenna include circularly-polarized antennas which have a polarization characteristic rotating in a direction opposite to the base-station transmitting antenna and the child-station receiving antenna.
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Citations
22 Claims
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1. A wireless monitoring system using a base station and a child station, comprising:
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said base station including;
a base-station transmitting antenna for transmitting an electric power supplying carrier and a signal transmitting carrier to said child station; and
a base-station receiving antenna for receiving an output from said child station;
said child station including;
a child-station receiving antenna which comprises a balanced antenna;
a nonlinear circuit that receives an output from said child-station receiving antenna;
a smoothing circuit that receives an output from said nonlinear circuit;
a first high-frequency band-pass filter, a pass band of said first high-frequency band-pass filter comprising a frequency of said electric power supplying carrier;
an intermediate-frequency band-pass filter, a pass band of said intermediate-frequency band-pass filter comprising an intermediate frequency which comprises a differential frequency between said electric power supplying carrier and said signal transmitting carrier;
a demodulator that receives an output from said intermediate-frequency band-pass filter and uses an output from said smoothing circuit as a power source, a baseband circuit that modifies a baseband signal using an output from said demodulator;
a modulator for modulating a high frequency signal outputted from said first high-frequency band-pass filter by using said baseband signal; and
a child-station transmitting antenna for radiating an output from said modulator, wherein said base-station transmitting antenna and said child-station receiving antenna comprise circularly-polarized antennas which have a same rotating direction, and said child-station transmitting antenna and said base-station receiving antenna comprise circularly-polarized antennas which have a polarization characteristic rotating in a direction opposite to said base-station transmitting antenna and said child-station receiving antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A child station used in a wireless monitoring system using an electric power supplying carrier and a signal transmitting carrier, comprising:
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a child-station receiving antenna which comprises a balanced antenna;
a nonlinear circuit which receives an output from said child-station receiving antenna;
a smoothing circuit which receives an output from said nonlinear circuit;
a first high-frequency band-pass filter, a pass band of said first high-frequency band-pass filter comprising a frequency of said electric power supplying carrier;
an intermediate-frequency band-pass filter, a pass band of said intermediate-frequency band-pass filter comprising an intermediate frequency which comprises a differential frequency between said electric power supplying carrier and said signal transmitting carrier;
a demodulator which receives an output from said intermediate-frequency band-pass filter and uses an output from said smoothing circuit as a power source;
a baseband circuit which modifies a baseband signal based on an output from said demodulator;
a modulator for modulating a high frequency signal outputted from said first high-frequency band-pass filter by using said baseband signal; and
a child-station transmitting antenna for radiating an output from said modulator, wherein said child-station receiving antenna and said child-station transmitting antenna are circularly-polarized antennas which have a polarization characteristic rotating in an opposite direction from each other.
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22. A wireless monitoring system for a base station and a child station, comprising:
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a base-station transmitting antenna and a base-station receiving antenna; and
a child-station transmitting antenna and a child-station receiving antenna, wherein said base-station transmitting antenna and said child-station receiving antenna comprise circularly-polarized antennas which have a same rotating direction, and said child-station transmitting antenna and said base-station receiving antenna comprise circularly-polarized antennas which have a polarization characteristic rotating in a direction opposite to said base-station transmitting antenna and said child-station receiving antenna.
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Specification