Circular polarized tunable square slot cut elliptical patch microstrip antenna
2016
In circularly polarized radiation, the rotational orientations of the transmitter and the receiver antennas are unimportant in relation to the received signal strength. In this paper, a center square slot cut elliptical patch microstrip antenna to realize a tunable circular polarization in 1000 MHz frequency band is proposed. It yields axial ratio bandwidth of nearly 1.2% over tunable range. A rectangular slot cut elliptical microstrip antenna is also proposed which provides return loss and axial ratio bandwidth of nearly 47 and 3 MHz. The proposed configurations yield broadside radiation pattern over entire bandwidth with antenna gain of more than 4 dBi in their suspended variation. The proposed configuration can find applications in mobile communication environment in 1000 MHz frequency band and can also be tuned to a required frequency in the given range by using appropriate slot length.
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