Patent ID: 7890070

Claim:
A filter circuit arrangement for filtering a radio-frequency signal having a frequency, comprising: a first tunable filter having an attenuation characteristic; a phase regulation loop that holds said first tunable filter to a transmission phase that is constant relative to the frequency of the radio-frequency signal; a second tunable filter connected in parallel with the first tunable filter in the phase regulation loop, said second tunable filter having an attenuation characteristic that is different from the attenuation characteristic of the first tunable filter; and said first tunable filter and said second tunable filter being connected within said phase regulation loop to cause a capture range of the filter circuit arrangement, in which tuning of the phase regulation loop to the radio-frequency signal is possible, to be dominated by the attenuation characteristic of the second tunable filter, and to cause a transmission behavior of the filter circuit arrangement to be dominated by the attenuation characteristic of the first tunable filter when the phase regulation loop is tuned to said radio-frequency signal.