Patent ID: 8305161

Claim:
A wireless communication device comprising: a radio system that operates in a first passband and a second passband, the second passband being established above the first passband, wherein a stop band is formed below the first passband; transmitting and receiving paths of the radio system, wherein the radio system is designed to receive a further signal in the stop band in order to filter out interference noise that is generated in the transmitting path and lies in the stop band between a transmitting path and an antenna; and a filter circuit coupled to the radio system, the filter circuit comprising: a multilayered substrate having integrated structured metallization planes; an input port and an output port; first and second filter branches coupled in parallel between the input port and the output port; a first subfilter arranged in the first filter branch, the first subfilter comprising a bandpass filter for the first passband; a second subfilter arranged in the second filter branch, the second subfilter comprising a high-pass filter having the second passband, wherein the bandpass filter and the high pass filter are constructed from inductor and capacitor elements that are at least partly integrated in the multilayered substrate, wherein the high-pass filter has a cut-off frequency that is chosen to be in the range of the first passband; a transverse branch connected to ground in the first filter branch; and an electroacoustic resonator arranged in the transverse branch, wherein the resonator has a quality factor of at least 500.