Abstract:
Proposed in this paper is a new configuration for a quad-band
antenna based on using a metamaterial-inspired defected ground
structure. The presented structure is introduced as a new modified
metamaterial Complementary Split Ring Resonator (CSRR) with a
compact electrical size. The new modified CSRR has been employed
in Composite Right/Left-Handed (CRLH) transmission line config-
uration for ultra-size reduction. Validation for the particle small size
is introduced and the detailed analysis for the NRI characteristics
has been discussed by extracting the cell constitutive parameters.
Hence, a multi-band antenna is designed based on using only one
cell of the proposed NRI-TL. Subsequently, a small multi-band
antenna is presented for different multi-band functionalities and
different radiation properties. The antenna displays quad-reso-
nances at 1.78 GHz, with the typical omnidirectional radiation
pattern, 3.28 GHz, 4 GHz, and 4.3 GHz, with the directive broadside
radiation properties. The proposed antenna footprint is 10 × 10
cm2
, which exhibits a size reduction of up to 80% in comparison
with a rectangular patch antenna operating at the lowest frequency
band.
