Communication card and communication device
First Claim
1. A communication card as a card-shaped communication device that is used being inserted into a card slot of an information device, said communication card including:
- an antenna for receiving or outputting communication waves; and
an antenna matching means for establishing a conjugate match between an input impedance of the antenna and an output impedance of a matching circuit so as to have resistors which are equal to each other and reactances which have opposite signs but equal absolute values, said antenna being placed to be electromagnetically coupled with a metallic body which constitutes the information device, via an internal wall of the card slot, and said antenna matching means varying a circuit parameter as well as detecting a reflected signal from the antenna at transmission, and deciding the circuit parameter such that the reflected signal has a minimum amplitude at receiving.
1 Assignment
0 Petitions
Accused Products
Abstract
This communication card or communication device includes: an antenna 101 for transmitting/receiving communication waves; a variable matching unit 102a which can vary a circuit parameter; a directional coupling unit 103 for extracting a reflected signal from the antenna 101; a detection unit 110 for extracting the amplitude of the reflected signal; a control unit 109 for outputting a control signal; an amplifier 104 for amplifying a high frequency signal at a RF band; a frequency converter 105 for converting an IF band signal into a RF band signal or a RF band signal into an IF band signal; a modulator/demodulator 106 for modulating an IF signal to obtain a baseband signal at the transmission and demodulating an IF signal to obtain a baseband signal at the receiving; a baseband processor 107 for processing the baseband signal; and a card interface 108 for exchanging data with an information device. This communication card or communication device has a miniaturized part that protrudes from the body of the communication device as well as prevents deterioration of the antenna characteristics, and further makes the antenna portion hardly broken.
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Citations
25 Claims
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1. A communication card as a card-shaped communication device that is used being inserted into a card slot of an information device,
said communication card including: -
an antenna for receiving or outputting communication waves; and
an antenna matching means for establishing a conjugate match between an input impedance of the antenna and an output impedance of a matching circuit so as to have resistors which are equal to each other and reactances which have opposite signs but equal absolute values, said antenna being placed to be electromagnetically coupled with a metallic body which constitutes the information device, via an internal wall of the card slot, and said antenna matching means varying a circuit parameter as well as detecting a reflected signal from the antenna at transmission, and deciding the circuit parameter such that the reflected signal has a minimum amplitude at receiving. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An information device that is used being attached to a connector of an information device,
said information device including: -
an antenna for receiving or outputting communication waves;
an antenna matching means for establishing a conjugate match between an input impedance of the antenna and an output impedance of a matching circuit so as to have resistors which are equal to each other and reactances which have opposite sings but equal absolute values, said antenna being placed to be electromagnetically coupled with a metallic body which constitutes the information device, and said antenna matching means varying a circuit parameter as well as detecting a reflected signal from the antenna at transmission, and deciding the circuit parameter such that the reflected signal has a minimum amplitude at the receiving.
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Specification