A Dual-Band Frequency-Tunable Magnetic Dipole Antenna for WiMAX/WLAN Applications

In this letter, a new dual-band frequency-tunable antenna for Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Local Area Network (WLAN) is proposed. The frequency tuning is realized by the insertion of two varactor diodes into the antenna structure. At the resonant frequencies, the antenna behaves like two magnetic dipoles. The antenna is designed and fabricated. Measurements show that the antenna presents two narrow-band resonant frequencies that can be tuned separately. Either of the two bands can be tuned independently by varying the dc bias of the varactors from 0 to 30 V while keeping the other extremely stable. The antenna can cover 230 MHz of WiMAX frequency band (3.28-3.51 GHz) and 560 MHz of WLAN band (5.47-6.03 GHz). The proposed antenna has a considerable importance in wireless communications because of its planar shape, compact size, simple dc feeding network, and the frequency tuning of one band does not have any effect on the second band.

[1]  Abdel Fattah Sheta,et al.  Compact dual-band tunable microstrip antenna for GSM/DCS-1800 applications , 2008 .

[2]  Gabriel M. Rebeiz,et al.  Tunable Dual-Band Antennas for 0.7–1.1-GHz and 1.7–2.3-GHz Carrier Aggregation Systems , 2015, IEEE Transactions on Antennas and Propagation.

[3]  Shih-Yuan Chen,et al.  Compact dual-band reconfigurable CPW antenna with varactor diodes , 2014, 2014 Asia-Pacific Microwave Conference.

[4]  R. Jakoby,et al.  A compact antenna with two independently tunable frequency bands , 2008, 2008 IEEE Antennas and Propagation Society International Symposium.

[5]  Tie Jun Cui,et al.  A Novel Miniaturized Printed Planar Antenna Using Split-Ring Resonator , 2008, IEEE Antennas and Wireless Propagation Letters.

[6]  Alejandro R. Diaz,et al.  A Tunable Dual-Band Miniaturized Monopole Antenna for Compact Wireless Devices , 2014, IEEE Antennas and Wireless Propagation Letters.

[7]  T. I. Yuk,et al.  Dual-Band Monopole Antenna With Frequency-Tunable Feature for WiMAX Applications , 2013, IEEE Antennas and Wireless Propagation Letters.

[8]  K. Sarabandi,et al.  Dual-band reconfigurable antenna with a very wide tunability range , 2006, IEEE Transactions on Antennas and Propagation.