Radio station with optimized impedance
First Claim
1. A radio station for transmitting signals, the radio station comprising:
- a modulator modulating a signal to be transmitted;
a power amplifier connected to said modulator for amplifying the modulated signal and producing an output power and a test signal;
a summing device connected to said power amplifier for subtracting the test signal of the power amplifier from a reference signal to generate a control signal;
an antenna for transmitting and receiving the signals;
an impedance with a variable reactance being switched between said antenna and said power amplifier;
an analog-to-digital converter converting the control signal to a digital signal; and
a processor using the digital signal to change said variable reactance of said impedance.
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Accused Products
Abstract
A radio station optimizes the impedance. An antenna of a transmitter of the radio station matches an output impedance of a power amplifier by adding an impedance with a variable reactance. A processor adjusts the variable reactance of the impedance according to an output signal of the power amplifier. The impedance with the variable reactance preferably includes either a plurality of inductors and capacitors, variable inductors and capacitors, or a plurality of microstrip lines. The processor calculates an optimum value for the variable reactance according to a measurement of the output signal of the power amplifier and stores those values for those measured values. In this way, a table is created, so that when the output signal is again measured the processor can use this table to determine which variable reactance will lead to impedance matching.
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Citations
10 Claims
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1. A radio station for transmitting signals, the radio station comprising:
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a modulator modulating a signal to be transmitted;
a power amplifier connected to said modulator for amplifying the modulated signal and producing an output power and a test signal;
a summing device connected to said power amplifier for subtracting the test signal of the power amplifier from a reference signal to generate a control signal;
an antenna for transmitting and receiving the signals;
an impedance with a variable reactance being switched between said antenna and said power amplifier;
an analog-to-digital converter converting the control signal to a digital signal; and
a processor using the digital signal to change said variable reactance of said impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification