Wireless communication RF circuit and communication apparatus including the same
First Claim
1. A wireless communication radio frequency circuit comprising:
- an antenna that transmits and receives radio waves;
a demodulator circuit that detects a received radio wave received by the antenna and extracts a signal wave; and
a modulator circuit that mixes a signal wave supplied from a signal feeder with a carrier;
whereinthe antenna, the modulator circuit, and the demodulator circuit are serially connected to one another in a sequence;
a Single Pole Single Throw switching circuit is serially connected directly between the modulator circuit and the demodulator circuit;
the Single Pole Single Throw switching circuit is switched ON upon reception to transmit a signal received by the antenna to the demodulator circuit and is switched OFF upon transmission to separate the demodulator circuit from the modulator circuit; and
the Single Pole Single Throw switching circuit includes an FET.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless communication RF circuit includes a transmitting-and-receiving antenna, a modulator circuit, an SPST switching circuit, and a demodulator circuit, which are arranged in a sequence. Upon signal reception, the SPST switching circuit is switched ON, and the demodulator circuit extracts a signal wave from a signal received by the antenna and outputs the signal wave to a control circuit. Upon signal transmission, the SPST switching circuit is switched OFF, and the modulator circuit mixes transmission data supplied from the control circuit with a carrier and outputs the carrier to the antenna. Only a single antenna is required. Upon signal reception, the influence of the modulator circuit is negligible. Upon signal transmission, the SPST switching circuit is switched OFF, thus the effect of the demodulator circuit is negligible, which greatly reduces loss.
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Citations
24 Claims
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1. A wireless communication radio frequency circuit comprising:
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an antenna that transmits and receives radio waves; a demodulator circuit that detects a received radio wave received by the antenna and extracts a signal wave; and a modulator circuit that mixes a signal wave supplied from a signal feeder with a carrier;
whereinthe antenna, the modulator circuit, and the demodulator circuit are serially connected to one another in a sequence; a Single Pole Single Throw switching circuit is serially connected directly between the modulator circuit and the demodulator circuit; the Single Pole Single Throw switching circuit is switched ON upon reception to transmit a signal received by the antenna to the demodulator circuit and is switched OFF upon transmission to separate the demodulator circuit from the modulator circuit; and the Single Pole Single Throw switching circuit includes an FET. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless communication radio frequency circuit comprising:
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an antenna that transmits and receives radio waves; a demodulator circuit that detects a received radio wave received by the antenna and extracts a signal wave; and a modulator circuit that mixes a signal wave supplied from a signal feeder with a carrier;
whereinthe antenna, the modulator circuit, and the demodulator circuit are serially connected to one another in a sequence; a Single Pole Single Throw switching circuit is serially connected between the modulator circuit and the demodulator circuit; the Single Pole Single Throw switching circuit is switched ON upon reception to transmit a signal received by the antenna to the demodulator circuit and is switched OFF upon transmission to separate the demodulator circuit from the modulator circuit; the Single Pole Single Throw switching circuit includes an FET; and the modulator circuit is a reflective modulator circuit that modulates the phase of the signal received by the antenna in accordance with the signal wave and reflectively transmits the modulated signal.
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12. A wireless communication radio frequency circuit comprising:
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an antenna that transmits and receives radio waves; a demodulator circuit that detects a received radio wave received by the antenna and extracts a signal wave; and a modulator circuit that mixes a signal wave supplied from a signal feeder with a carrier;
whereinthe antenna, the modulator circuit, and the demodulator circuit are serially connected to one another in a sequence; and a Single Pole Single Throw switching circuit is serially connected directly between the modulator circuit and the demodulator circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification