III. Experimental Results
The configuration of the reported antenna with conical horn is
shown in the Fig. 1. Antenna used RT duriod 5880 substrate
with permittivity 2.2 with thickness of 1 mm and total height of
the antenna is 3 mm. the antenna is feed by 50 ohm coaxial
cable.
The surface mounted horn antenna improves the gain of the
patch antenna from 7.7 dBi to 11.2dBi. Thus surface mounted
horn enhances the gain of the antenna by 3.5dBi as shownThe resonance frequency of the patch without the embedded
horn is 12.77GHz with 5% impedance bandwidth. The embedded
horn bring down the resonance frequency to 12.74GHz and also
bring down the impedance bandwidth marginally, 4.8%, it also
reduces the return loss from 23.5dB to 19.2 dB. The result of the
return loss with and without horn is shown in Fig. 3. Finally, we
Insert a square ring around patch of width 2.43(equivalent of 50
ohm Microstrip ring) which create capacitive effect with patch
which enhance the return loss as well as impedance bandwidth.
Fig. 4 shows the radiation pattern of all three antennas in both
the E-and H-planes. There is considerable improvement in the
side lobe level of the antenna. The performance of the antenna
is summaries