Patent ID: 7389090

Claim:
A wireless communications device for generating transmitted electronic signals in response to input electronic signals having first input electronic signals at a first frequency and second input electronic signals at a second frequency, comprising: a) a diplexer adapted to receive the input electronic signals and selectively output one of first electronic signals and second filtered electronic signals, including: b) a first frequency filtering circuit, comprising a first resonator circuit to receive the input electronic signals, said first resonator circuit comprising a first transmission line and a first capacitor coupled to the first transmission line; a second resonator circuit in parallel to the first resonator circuit, said second resonator circuit comprising a second transmission line and a second capacitor coupled to the second transmission line to produce first filtered electronic signals at the first frequency; and a coupling circuit that couples the first resonator circuit and the second resonator circuit; c) a second frequency filtering circuit, comprising a third resonator circuit to receive to receive the input electronic signals, said third resonator circuit comprising a third transmission line and a third capacitor coupled to the third transmission line; a fourth resonator circuit in parallel to the third resonator circuit, said fourth resonator circuit comprising a fourth transmission line and a fourth capacitor coupled to the fourth transmission line to produce a second filtered electronic signals at the second frequency; and a coupling circuit that couples the third resonator circuit and the fourth resonator circuit; d) a power amplifier coupled to the diplexer, said power amplifier being capable of amplifying the selected one of the first filtered electronic signals and the second filtered electronic signals from the diplexer to produce amplified electronic signals; and e) an antenna adapted to receive the amplified electronic signals to produce the transmission electronic signals.