Look-up table for control of power output from FM transmitters

• US 8,200,172 B2
• Filed: 07/30/2008
• Issued: 06/12/2012
• Est. Priority Date: 07/30/2008
• Status: Expired due to Fees

• Current Assignee: Monster, Inc. (Atlantic Acquisition, Inc.)
• Original Assignee: Monster, Inc. (Atlantic Acquisition, Inc.)
• Inventors: Martin, Demian
• Primary Examiner(s): Trinh, Sonny
• Application Number:
  US12/182,483
• Publication Number:
  US 20100029231A1
• Time in Patent Office: 1,413 Days
• Field of Search: 455/522, 455/91, 455/103, 455/115.1, 455/139, 455/150.1, 455/113, 455/127.1
• US Class Current: 455/127.1
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A system and method for optimizing the performance of RF devices having a transmitter and an antenna that function at multiple frequencies. Due to regulatory limits on radiation output, and because antenna gain varies with frequency, transmitter power has been constrained by the highest efficiency point of the antenna. According to the present invention, the optimal power setting is empirically determined for each frequency, and stored in a data table. When an operational frequency is selected for the RF device, the data table is consulted to determine the appropriate power setting for the transmitter.

Claims

1. A radio frequency (RF) device for transmitting RF signals at multiple operating frequencies the RF device having:

a. an RF transmitter for the generation of RF signals;

b. an antenna for improving the efficiency of transmission of the RF signals, the antenna being coupled to the RF transmitter;

c. a memory storage component comprising a data table containing values for the maximum allowable radiation output for RF transmitters at each operating frequency that are within legal limits;

d. a controller coupled with said memory storage component for adjusting the frequency and power output of the RF transmitter, wherein for each operating frequency, the output of the RF transmitter is automatically adjusted so as to maximize the overall radiation output of the RF device within legal limits.

2. A method of transmitting the maximum radiation output of an RF device in accordance with legal limits, the RF device having an RF transmitter for generating an RF signal and an antenna coupled to the RF transmitter for increasing the efficiency of transmission, wherein the RF device transmits RF signals at multiple operating frequencies the method comprising the following steps:

a. determining applicable operating frequencies of transmission;

b. determining the maximum radiation output settings for the applicable operating frequencies within legal limits for the RF transmitter by consulting a data table stored in a controller memory containing the values for these settings; and

c. Transmitting the RF signals at the maximum radiation output settings within legal limits.