Compact Epsilon negative ZOR-antenna

In this paper, we have presented the design of a compact Epsilon negative (ENG) zeroth order resonating (ZOR) antenna based on conventional mushroom type (CMT) of structure with complementary split ring resonator (CSRR). In the proposed antenna, unit cell is constructed by etching the CSRR on the patch of CMT structure. The 4 unit cells antenna is excited with quarter wavelength transmission line (TL). The size of the unit cell is 0.073 λ
0
× 0.073 λ
0
and the physical size of antenna is 0.073λ
0
×0.29λ
0
at ZOR frequency, where λ
0
is the free space wavelength. The radiation efficiency and absolute gain are observed to be 34.6 % and −2.67 dB respectively.