Abstract—In this paper, DR (Dielectric Resonator) loading
technique is implemented in a narrowband microstrip patch
antenna for increasing impedance BW (bandwidth) and rad.
(radiation) efficiency without much affecting its performance.
The original patch antenna has 2.2% impedance bandwidth and
92.7% radiation efficiency. The BW enhancement is achieved
without changing feed location or any antenna dimension.
Position of DR on the patch surface for maximum percentage
bandwidth is optimized and it is at the center of feed location. So
the additional DR is placed at the center of feeding point. Here
four different structures of DR are proposed for loading on the
proposed antenna. In the first structure, DR disc is loaded, while
in the second structure, loading is done using coaxial cylindrical
DR. In the third structure DR brick is used for loading, while in
the forth structure cylindrically cut DR brick is loaded on the
feed point. Further improvement in BW and rad. efficiency is
achieved by increasing substrate thickness and keeping all other
dimensions same as they were.
Keywords—MPA: Microstrip Patch antenna, DR: Dielectric
Resonator, BW: Bandwidth, Input Impedance Loci, rad. efficiency:
radiation efficiency, RL: Return Loss