US Patent No. 9,407,382


Patent No. 9,407,382
Issue Date August 02, 2016
Title Positioning Stub For Mitigation Of Return Loss During Signal Transmission
Inventorship Chaitanya Chukka, Overland Park, KS (US)
Eugene S. Mitchell, Jr., Blue Springs, MO (US)
Assignee Sprint Communications Company L.P., Overland Park, KS (US)

Claim of US Patent No. 9,407,382

1. A system for mitigating signal return loss, the system comprising:
a radio transmitter configured to measure voltage standing wave ratio (VSWR) and compute associated signal return loss;
a radio antenna configured to broadcast over air a radio signal generated by the radio transmitter;
a signal transmission line that couples the radio transmitter to the radio antenna, wherein the signal transmission line is
configured to transmit the radio signal to the radio antenna along a signal path; and

a positioning stub coupled to the radio transmitter, the signal transmission line, and the radio antenna, the positioning
stub configured to move to different locations along the signal path to dynamically change an impedance of the signal path,
wherein the radio transmitter is further configured to:

compute a first signal return loss along the signal path,
determine if the first signal return loss is higher than a predetermined threshold of signal return loss, and
upon determining that the first signal return loss is higher than the predetermined threshold, determine that the positioning
stub should be moved from a first location to a second location to change the impedance of the signal path.