| 摘要 |
<p>A power efficient indoor radio base station for use with wireless cellular telecommunication systems is disclosed. A small unitary package design is achieved by reducing the level of power dissipation, and subsquently, the size of the heat sink required for heat dissipation. In a preferred embodiment of the present invention, a plurality of transmitter signals are combined in a hybrid combiner to generate a pair of output signals. A first output signal is transmitted through a dipole antenna resulting in vertical polarization and a second output signal is transmitted through a horizontal antenna producing horizontal polarization. Further, a phase shift of 90° is introduced between the signals prior to transmission. The resulting simultaneous transmission of the perpendicularly oriented signals yields a substantially circular polarized field in the area of coverage. Power dissipation is reduced by transmitting the horizontal polarized signal because it is converted to useful energy that would otherwise be dissipated in a load resistor.</p> |
