Mrs. Vishakha A. Kulkarni, Prof. V. S. Navale
In this paper, polarization diversity antenna system is implemented to achieve the vertical and horizontal polarization by using two orthogonally placed printed dipole antennas for ISM band applications. Simulation, fabrication & measurements are carried out for polarization diversity printed dipole antenna at 2.4GHz centre frequency. Here two orthogonal printed dipoles are simulated in HFSS simulation software and are fed by using via balun structure. A p-i-n diode (HSMP 1321) is used to switch between vertical and horizontal polarization for the respective antenna and the specified polarization is achieved. The simulation of PIN diode is done using ADS simulation software. The printed dipole antenna and the pin diode bias circuit is kept separate purposefully to avoid the interference between the RF and DC circuits of both. The whole structure is fabricated on FR4 substrate having dielectric constant 4.4. The simulated results of antenna include co-polar and cross-polar levels, return loss and the pin diode switch performance.
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