Patent ID: 7171237

Claim:
A modular card style radio-signal modem suitable for wireless data communication to a personal computer, the modem comprising: a main circuit board substrate defining an opening; a card-to-computer connection interface operably linked to the circuit board; a radio transceiver on the circuit board in communication with said connection interface, the radio transceiver having a receiver input and a transmitter output; a carrier substrate attached at the periphery offset of the opening such that a portion of the substrate extends over the opening; and a dielectric block antenna duplexer surface mounted to the carrier substrate on the portion that extends over the opening, the antenna duplexer being an elongate ceramic block and having a transmit electrode in electric communication with the transmitter output, a receive electrode in electric communication with the receiver input and an antenna connection electrode, the antenna duplexer further including: a transmitter branch extending between the antenna electrode and a first end of the block; a receiver branch extending between the antenna electrode and a second end of the block; each branch having a plurality of through-hole resonators; a local ground conductive layer on the elongate block; the transmit electrode being spaced apart from the antenna electrode along a length of the block and positioned in the transmitter branch; and the receive electrode being spaced apart from the antenna electrode along the length of the block and positioned in the receiver branch.