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This work presents a dual-band high-gain metamaterial radome which can increase antenna gain. This radome operates at the WiMAX (3.5GHz) band and the WiFi (5.8GHz) band. The refractive index of this radome is designed to near zero. The radiation beamwidth of antenna becomes small and the antenna gain is increasing. The size of this radome is 90 mm × 90 mm. This radome improves antenna gain 2.6 dB...
In this paper, a planar circular patch array antenna that features electric fields focused in the near-field zone for 2.4 GHz radio frequency identification (RFID) applications is presented. This array antenna is implemented by using six circular patch elements and a microstrip feeding network with a proper input phase for each element. The array antenna is capable of enhancing electric field distributions...
In this paper, the subwavelength corrugated grooves and conventional artificial periodic grooves are integrated and applied in the slots array antenna. The radiation performance of the designed antenna is investigated, and simulation results show that the gain is significantly improved and the backward radiation is largely suppressed. The relation of the antenna gain with groove number is studied...
In this paper, a novel corrugated ground loaded with medium is proposed for enhancing the directivity of circular polarized patch antenna. Different from the suppression of surface wave propagation in the choke grooves, the proposed corrugated structure can modulate surface wave distribution and reradiate parts of surface energy into free space, resulting in the beaming effect. The radiation performance...
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