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Active integrated antennas are a synergistic mixture of circuit and antenna technologies, that has lead to a range of innovative structures and geometries, which are now being developed for inclusion in a number of practical applications. However the mixture leads to some limitations and these are reviewed. Furthermore there are new opportunities opening up including integration with photonic systems,...
Novel results are presented for the radiated harmonics from varactor loaded microstrip antennas. Results are given for rectangular half wavelength and quarter wavelength microstrip antennas. The effect of the tuning range is also investigated.
When designing the front end of a two way single antenna communication system, the separation of the transmit power from the receiver components is of utmost importance. Without such separation many problems are encountered, for example the transmit signal causing feedback into the system or the transmit power saturating the receiver components possibly to the point of destroying them. High power...
In this paper, a circuit model of PIN avalanche photodiodes is successfully incorporated into the FDTD analysis of optoelectronic active antennas. As an example, an active patch antenna array with two patches, one PIN-APD, two amplifiers and matching networks is analysed by using the FDTD method. The electromagnetic coupling effects between the microstrip matching network and the patches are investigated...
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