Patent ID: 7941194

Claim:
A system having co-located antennas for simultaneous receive and transmit operations, comprising: a first module, comprising transmit circuitry configured to transmit signals within a first frequency range, the first frequency range being within an FM band for FM audio broadcasts; and a transmit antenna coupled to the transmit circuitry, the transmit antenna being electrically small such that it is 1/10 or smaller in size as compared with frequencies within the first frequency range; and a second module, comprising: receive circuitry configured to receive signals within a second frequency range and to operate simultaneously with the transmit circuitry, the frequencies within the second frequency being within about three-times (3×) the frequencies within the first frequency range; and a receive antenna coupled to the receive circuitry and positioned within close proximity to the transmit antenna such that it is within about one wavelength of the frequencies within the first frequency range, the receive antenna being electrically small such that it is one-tenth ( 1/10) or smaller in size as compared with frequencies within the second frequency range; wherein the receive antenna is oriented with respect to the transmit antenna so that nulls of one or both of the antennas overlap the other antenna; wherein electromagnetic fields of the antennas are cross-polarized; and wherein the first and second modules are configured to be detachably connected to each other in a docking arrangement, such that the transmit antenna and the receive antenna are located in a fixed relationship when the first and second modules are docked.