System and method of measuring total radiated power from mobile wireless communications device

Abstract

A system for testing a communications device includes a portable wireless communications device comprising a transmitter for transmitting an RF signal. A monitoring device receives the RF signals from the portable wireless communications device and analyzes the RF signals to determine total radiated power emitted from the transmitter. An adaptive antenna equivalent circuit is coupled to the transmitter. A connection line extends between the adaptive antenna equivalent circuit and the monitoring device. The adaptive antenna equivalent circuit has an equivalent antenna impedance matched to the portable wireless communications device and the connection line and monitoring device based on transmit frequency to ensure that total radiated power of the RF signals is transmitted from the transmitter to the monitoring device.

1 - 23 . (canceled) 
     
     
         24 . A test system comprising:
 a portable wireless communications device comprising a power amplifier and power amplifier matching network coupled thereto;   an adaptive antenna equivalent circuit coupled to said power amplifier matching network;   a monitoring device;   a connection line between the adaptive antenna equivalent circuit and the monitoring device; and   a controller coupled to the adaptive antenna equivalent circuit and configured to vary the impedance and adapt to impedance changes resulting from different transmit test frequencies so that the adaptive antenna equivalent circuit has an equivalent antenna impedance matched to the portable wireless communications device and the connection line.   
     
     
         25 . The test system according to  claim 24 , wherein the adaptive antenna equivalent circuit comprises a pair of capacitors coupled in parallel to a voltage reference. 
     
     
         26 . The test system according to  claim 25 , wherein the adaptive antenna equivalent circuit further comprises a conductor of predetermined wavelength that is matched for the portable wireless communications device and that extends between the pair of capacitors. 
     
     
         27 . The test system according to  claim 24 , wherein the adaptive antenna equivalent circuit comprises at least one variable capacitor. 
     
     
         28 . The test system according to  claim 24 , wherein the monitoring device comprises a spectrum analyzer. 
     
     
         29 . The test system according to  claim 24 , wherein the connection line comprises a coaxial cable. 
     
     
         30 . The test system according to  claim 29 , wherein the coaxial cable comprises a 50 ohm antenna cable. 
     
     
         31 . The test system according to  claim 24 , further comprising a grounded switch coupled between the power amplifier matching network and adaptive antenna equivalent circuit. 
     
     
         32 . A test system comprising:
 a portable wireless communications device comprising a power amplifier and power amplifier matching network coupled thereto;   an adaptive antenna equivalent circuit coupled to said power amplifier matching network and comprising at least one variable capacitor;   a monitoring device;   a connection line between the adaptive antenna equivalent circuit and the monitoring device; and   a controller coupled to the adaptive antenna equivalent circuit and configured to vary the impedance and adapt to impedance changes resulting from different transmit test frequencies so that the adaptive antenna equivalent circuit has an equivalent antenna impedance matched to the portable wireless communications device and the connection line, the different test frequencies comprising a plurality of different frequency channels within each of a plurality of different frequency bands.   
     
     
         33 . The test system according to  claim 32 , wherein the plurality of different frequency bands correspond to at least the 850, 900, 1800 and 1900 MHz frequency bands. 
     
     
         34 . The test system according to  claim 32 , wherein the at least one variable capacitor comprises a pair thereof coupled in parallel to a voltage reference. 
     
     
         35 . The test system according to  claim 32 , wherein the adaptive antenna equivalent circuit further comprises a conductor of predetermined wavelength that is matched for the portable wireless communications device and that extends between the pair of variable capacitors. 
     
     
         36 . The test system according to  claim 32 , wherein the monitoring device comprises a spectrum analyzer. 
     
     
         37 . The test system according to  claim 32 , wherein the connection line comprises a coaxial cable. 
     
     
         38 . The test system according to  claim 32 , further comprising a grounded switch coupled between the power amplifier matching network and adaptive antenna equivalent circuit. 
     
     
         39 . A test method comprising:
 coupling a portable wireless communications device comprising a power amplifier and power amplifier matching network coupled thereto through an adaptive antenna equivalent circuit and a connection line to a monitoring device;   controlling the adaptive antenna equivalent circuit to vary the impedance and adapt to impedance changes resulting from different transmit test frequencies so that the adaptive antenna equivalent circuit has an equivalent antenna impedance matched to the portable wireless communications device and the connection line; and   operating the portable wireless communications device and monitoring device to collect power measurements.   
     
     
         40 . The method according to  claim 39 , wherein the adaptive antenna equivalent circuit comprises a pair of capacitors coupled in parallel to a voltage reference. 
     
     
         41 . The method according to  claim 40 , wherein the adaptive antenna equivalent circuit further comprises a conductor of predetermined wavelength that is matched for the portable wireless communications device and that extends between the pair of capacitors. 
     
     
         42 . The method according to  claim 39 , wherein the adaptive antenna equivalent circuit comprises at least one variable capacitor. 
     
     
         43 . The method according to  claim 39 , wherein the monitoring device comprises a spectrum analyzer. 
     
     
         44 . The method according to  claim 39 , wherein the connection line comprises a coaxial cable.