Patent ID: 7009573

Claim:
A bidirectional repeater, comprising: a first antenna arranged to have a first polarization; a second antenna arranged to have a second polarization that differs from said first polarization by a polarization difference; a first amplifier circuit configured to receive a first signal from said first antenna and to provide an amplified first signal to said second antenna; and a second amplifier circuit configured to receive a second signal from said second antenna and to provide an amplified second signal to said first antenna; further including: a first choke arranged to reduce feedback signals from said first antenna to said second antenna; and a second choke arranged to reduce feedback signals from said second antenna to said first antenna; wherein: said first choke is arranged to form a shorted first cavity and define a slot that electromagnetically couples said first cavity to said first antenna; and said second choke is arranged to form a shorted second cavity and define a slot that electromagnetically couples said second cavity to said second antenna.