Patent ID: 8654743

Claim:
A configurable multiple antennas for a time division multiple access (TDMA) radio system between a base station and a locomotive, the configurable multiple antennas comprising: a first antenna connected to a transmit signal port through a first electrical path, wherein the first electrical path has substantially zero loss; a second antenna connected to a receive signal port through a second electrical path, wherein the second electrical path has substantially zero loss; a first control circuit coupled between the first antenna and the receive signal port, wherein a first control signal is operable on the first control circuit to cause the first control circuit in an ON state or an Off state, and wherein a third electrical path from the first antenna to the receive signal port is provided when the first control circuit is in the ON state; and a second control circuit coupled between the second antenna and a ground node, wherein a second control signal is operable on the second control circuit to cause the second control circuit in the ON state or the Off state, and wherein the second antenna is grounded when the second control circuit is in the ON state; and wherein the configurable multiple antennas are configured to a selected antenna operation mode according to the first control signal and the second control signal.