Abstract
Herein a simple, compact quad-band circularly polarized monopole antenna
is proposed for multisystem application. The monopole antenna is
constructed via triple strip fed by the microstrip line, a ground plane
on the reverse side of the substrate having a slotted square loop, and
two stubs which are slotted employed transversely across the diagonal
line on the square loop. This proposed antenna is simulated and
fabricated to stimulate a number of resonances. Optimizations of the
antenna design parameters combined the resonances, and thus obtained a
wide multi impedance bandwidth (IBW). The measured multi IBW at
S11<-10dB ranges from 4.63 – 5.47 GHz, 6.08 – 6.59 GHz, 8.26
– 9.59 GHz, 10.05- 10.42 GHz, and 11.81 – beyond 15 GHz. The simulated
quad axial ratio bands are 217, 269, 223 and 564 MHz at centre
frequencies (fc) of 5.3, 9.0, 12.1 and 13.8 GHz, correspondingly.
Implemented antenna radiation features are also presented and
deliberated.