Antenna Tuning Unit

摘要

A system, apparatus, and method directed to impedance matching an antenna with a transmitter for non-directional radio beacons. The apparatus includes an L-type impedance network comprising non-capacitive elements and at least one variable inductor on each branch of the impedance network. Also, system, apparatus, and method directed to providing a low power signal for tuning the antenna. The apparatus includes an impedance matching network and a signal generator. Also, a system, apparatus, and method directed to providing an estimate of near-field strength of a signal from an antenna. The apparatus includes an impedance matching network, a near-field signal strength detector, and microcontroller configured to estimate the near-field signal strength. Corresponding systems includes using the respective apparatuses between an antenna and a transmitter. Corresponding methods are directed to the use of the apparatuses and systems.

主权项

1. An apparatus for maintaining a constant radio signal strength, the apparatus comprising:
a. at least one sensor configured to estimate at least one radio signal strength of a radio signal from an antenna; and b. a microcontroller configured to receive the at least one estimated radio signal strength and to transmit a signal strength indication to a radio transmitter.