Abstract: When commonly using a receiving antenna and a transmitting antenna having mutually opposing characteristics, the present invention makes it possible to commonly use the antennas without deteriorating the characteristics of both antennas. In a communication apparatus including both of an RF-ID function circuit to perform contactless communication with an external reader/writer device and a reader/writer function circuit to perform contactless communication with an external RF-ID, there is disposed a common antenna shared therebetween. And, a transmitting and receiving resonance frequency switching circuit is connected in parallel to the common antenna; when selecting each function, a resonance frequency is automatically changed by the transmitting and receiving resonance frequency switching circuit.

Abstract: When commonly using a receiving antenna and a transmitting antenna having mutually opposing characteristics, the present invention makes it possible to commonly use the antennas without deteriorating the characteristics of both antennas. In a communication apparatus including both of an RF-ID function circuit to perform contactless communication with an external reader/writer device and a reader/writer function circuit to perform contactless communication with an external RF-ID, there is disposed a common antenna shared therebetween. And, a transmitting and receiving resonance frequency switching circuit is connected in parallel to the common antenna; when selecting each function, a resonance frequency is automatically changed by the transmitting and receiving resonance frequency switching circuit.

Abstract: When commonly using a receiving antenna and a transmitting antenna having mutually opposing characteristics, the present invention makes it possible to commonly use the antennas without deteriorating the characteristics of both antennas. In a communication apparatus including both of an RF-ID function circuit 1 to perform contactless communication with an external reader/writer device and a reader/writer function circuit 2 to perform contactless communication with an external RF-ID, there is disposed a common antenna 10 shared therebetween. And, a transmitting and receiving resonance frequency switching circuit 11 is connected in parallel to the common antenna 10; when selecting each function, a resonance frequency is automatically changed by the transmitting and receiving resonance frequency switching circuit 11.

Abstract: When commonly using a receiving antenna and a transmitting antenna having mutually opposing characteristics, the present invention makes it possible to commonly use the antennas without deteriorating the characteristics of both antennas. In a communication apparatus including both of an RF-ID function circuit 1 to perform contactless communication with an external reader/writer device and a reader/writer function circuit 2 to perform contactless communication with an external RF-ID, there is disposed a common antenna 10 shared therebetween. And, a transmitting and receiving resonance frequency switching circuit 11 is connected in parallel to the common antenna 10; when selecting each function, a resonance frequency is automatically changed by the transmitting and receiving resonance frequency switching circuit 11.

Abstract: In an information delivery system, information desired by the user can be obtained while improving security of the system. A portable terminal registers a condition of an information delivery terminal to acquire information therefrom to a server. The server selects, from information of plural information delivery terminals, information of an information delivery terminal satisfying the condition, creates link information required for a link with the information delivery terminal satisfying the condition, and sends the link information to the portable terminal. The server delivers link information required for a link with the portable terminal to the information delivery terminal. The information delivery terminal automatically establishes a Bluetooth link with only the portable terminal according to the link information received from the server to provide information to the portable terminal.

Abstract: In an information delivery system, information desired by the user can be obtained while improving security of the system. A portable terminal registers a condition of an information delivery terminal to acquire information therefrom to a server. The server selects, from information of plural information delivery terminals, information of an information delivery terminal satisfying the condition, creates link information required for a link with the information delivery terminal satisfying the condition, and sends the link information to the portable terminal. The server delivers link information required for a link with the portable terminal to the information delivery terminal. The information delivery terminal automatically establishes a Bluetooth link with only the portable terminal according to the link information received from the server to provide information to the portable terminal.