Patent ID: 8149742
Filing Date: 2012-04-03
Classification: H04B

Abstract:
1. A diplexer for steering transmit and receive signals between an antenna and a transmitter and receiver of a radio frequency communication system, the diplexer comprising: a first quadrature hybrid device configured for bidirectional communication with the antenna and configured for routing transmission signals from the transmitter; at least one pair of filters coupled to quadrature ports of the first quadrature hybrid device, the at least one pair of filters providing a receive signal from the antenna via the first quadrature hybrid device for a receive path and reflecting a transmit signal from the transmitter via the first quadrature hybrid device for a transmit path, the at least one pair of filters configured to filter out noise from the receive signal and allow noise through from the transmit signal; and a second quadrature hybrid device configured to receive the outputs from each of the at least one pair of filters, the second quadrature hybrid device providing the filtered receive signal to the receiver or providing the noise from the transmit signal to a load, wherein the transmit signal is in a frequency range between 1350-1520 MHz and the receive signal is in a range between 1750-1850 MHz.