Design of 2.4?GHz/5?GHz planar dual-band electrically small slot antenna based on impedance matching circuit

摘要

AbstractA dual-band electrically small antenna based on impedance matching circuit is proposed. Which is fed by coplanar waveguide (CPW). The antenna includes two twin-spiral type slot-line short stubs and three open-circuited series-stubs with slot-line loaded at the central feed line of the CPW as impedance matching network. The total size of the antenna is12.45mm×13.05mm×0.8mm, withKα=0.45and0.95at 2.4?GHz and 5?GHz respectively. By the introduction of the proposed impedance matching network, the syntonic frequency of the antenna is achieved at 2.4?GHz and 5?GHz. And the measured bandwidth ofS11/mml:mo>-10dBis about 7.5% and 12% of the two resonant frequencies. The proposed antenna has a very small ground plane (0.9mm×1.8mm). And it is appropriately applied to wireless communication for considerable radiation efficiency.]]>