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Broadband transponder based on coupled antenna elements and phased modulators
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Sähkötekniikan korkeakoulu |
Master's thesis
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ELEC3038
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en
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41+8
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Abstract
A broadband transponder was studied over a frequency range of 1-6 GHz, which had strongly coupled antenna elements and phase variable modulators, and its performance was compared with a reference transponder which had a single antenna element connected to a single modulator. First, the transponders were mathematically modelled and their performances were studied through computer simulations. Then, the transponders were prototyped/demonstrated and their performances were studied through measurements.
In both simulations and measurements, it was found that the studied transponder with constantly phased modulators performed better than the reference transponder over a frequency range of 1-6 GHz. The studied transponder performed up to 40 dB higher at certain frequencies (e.g. at 1 GHz) compared with the reference transponder in both simulations as well as in measurements.
In addition to this, the performance of the studied transponder with optimally phased modulators was further increased up to 10 dB at certain frequencies in simulations. The received power of the studied transponder was measured only for five random samples of phase values. Even with these five randomly sampled phase values, it was found that the performance of the studied transponder with the sampled phased modulators increased up to 6 dB at certain frequencies, compared with the studied transponder with constantly phased modulators.