Automatic tuning device of transmitter loop antenna and tuning method based on the device
An automatic tuning and loop antenna technology, applied in the field of antenna tuning, can solve unwise problems
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Embodiment 1
[0049] Such as figure 1 As shown, in order to realize the automatic tuning technology of transmitter loop antenna, the present invention provides a kind of automatic tuning device of transmitter loop antenna, including adjustable capacitor array, differential power amplifier and tuning control device;
[0050] The differential power amplifier is connected to the loop antenna, and is used to amplify the differential radio frequency input signal and then radiate outward through the loop antenna;
[0051]The tuning control device is respectively connected to the differential power amplifier and the adjustable capacitor array, judges whether the loop antenna is detuned according to the phase difference between the differential radio frequency input signal and the differential radio frequency output signal of the differential power amplifier, and outputs digital control instructions to the adjustable capacitor array;
[0052] The adjustable capacitor array and the loop antenna are...
Embodiment 2
[0087] The difference between this embodiment and Embodiment 1 is that: figure 2 As shown, in step 5, the Q-channel frequency-divided differential signal of the differential radio frequency output signal and the I-channel frequency-divided differential signal of the differential radio frequency input signal are extracted for mixing processing to obtain a mixed output differential signal.
[0088] At this time, if the mixed frequency differential DC voltage is less than the preset reference DC voltage, that is, the phase difference between the I-channel frequency-divided differential signal of the differential RF output signal and the Q-channel frequency-divided differential signal of the differential RF input signal is 90 degrees, then the The output results of the lead comparator and the lag comparator are both "0";
[0089] If the mixing differential DC voltage is negative and greater than the preset reference DC voltage, that is, the phase difference between the I-way freq...
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