Remote antenna unit with external power control using a single control line

摘要

Apparatus and methods for efficient external control of the transmit power of a remote fixed gain antenna unit in RF communications. Apparatus embodiments include a separate feeding unit coupled to a remote fixed gain antenna unit through a single coaxial line. The feeding unit is operative to provide transmit control signals to the remote antenna unit based on power feedback created in the remote antenna unit and sent to the feeding unit over the single coaxial line. Feedback and transmit/receive control inputs are transmitted through the single coax line together with RF signals. The coax line may be long. The apparatus and methods may be used in a vehicular environment.

主权项

1. Apparatus for radio frequency (RF) communications comprising:
a) a remote fixed gain antenna unit coupled to an antenna; and b) a feeding unit configured to provide transmit control signals to, and to receive power feedback signals from the remote antenna unit over a single coaxial line, wherein the feeding unit includes a power control module which runs a control loop for adjusting antenna transmission power based on feedback received from the fixed gain antenna unit.