Enhanced voltage standing wave ratio measurement

摘要

Enhanced RF system measurement including measurement of reflected power of a transmission system using two directional couplers configured to couple reflected power (e.g., isolate forward power). The directional couplers may be placed at a distance of ¼ wave separation and measurements from the two directional couplers may be averaged to obtain a reflected power for the transmission path. The enhanced measurement of reflected power may be used to obtain a more accurate VSWR or return loss measurement. An indication of the reflected power (e.g., VSWR, return loss, etc.) may be fed back to a source, which may adjust transmit power based on the measured VSWR to achieve a certain amount of power conveyed to the load (e.g., target radiated power from an antenna, etc.). Error conditions may be detected and the source may terminate transmission to prevent potential adverse operating conditions.

主权项

1. A transmitter system for wireless communication, comprising:
a first directional coupler coupled with a transmission path and having a coupler directivity in a reflected power direction, the first directional coupler outputting a first coupled power of the transmission path; a second directional coupler coupled with the transmission path and having a coupler directivity in the reflected power direction, the second directional coupler outputting a second coupled power of the transmission path, wherein the second directional coupler is located to couple the second coupled power at a one-quarter wavelength distance at an operational frequency from the first coupled power along the transmission path; and a measurement device configured to measure the first coupled power and the second coupled power and determine a reflected power of the transmission path based on an average of the measured first coupled power and the measured second coupled power.