volume | PIER Journals

Abstract

A novel miniatured reconfigurable antenna for wireless applicationsusing defective ground structure is proposed and studied. This proposed antenna generates eight different frequencies, operating at 2 GHz (IMT), 2.3 GHz (UMTS), 2.5 GHz (Wi-Fi), 2.7 GHz (Radio astronomy), 2.9 GHz (Weather radar), 4.2 GHz (Radio altimeter), 4.4 GHz (Radio determination) and 5.5 GHz (Wi-MAX) while maintaining overall compact size of 24×33×1.6 mm³ using an FR-4 substrate having a permittivity of ε_r = 4.4. The proposed reconfigurable antenna consists of three switches in the slots of the patch along with rectangular defects on ground surface and a microstrip feed line. The lumped elements are used in place of three switches in the simulation to get tunable capacitance, which is responsible for frequency reconfigurability. It makes the antenna operate at eight useful bands. The structure shows the impedance bandwidths of 6.86%, 6.04%, 2.51%, and 2.73% with gains 5 dB, 4.8 dB, 6 dB, and 6.8 dB, respectively. The designed antenna can be easily integrated on the modern communication devices. A prototype of the designed antenna is fabricated, and simulation results are compared with measured values using PIN diode switches.

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Dr. Prathipati Rakesh Kumar

Dr. Pamarthi Sunitha

Dr. Makkapati Venkata Prasad