Abstract
Problem statement: Wideband compact antenna is highly demandable due to the dynamic development in the wireless technology. Approach: A simple, compact EBG microstrip antenna is proposed in this study that covers a wideband of 250 GHz and the design is conformal with the 2.45 GHz ISM band (WLAN, IEEE 802.11b and g)/Bluetooth/RFID applications. Results: A 6×6 array of square unit cell formed the EBG structure which is incorporated with the radiating patch to enhance the antenna performances. This design achieved an impedance bandwidth of 10.14% (2.34-2.59 GHz) at -10 dB return loss and VSWR ≤ 2. Simulated radiation pattern is almost omnideirectional. Conclusion/Recommendations: The simulated results prove the compatibility of the EBG antenna with the 2.45 GHz ISM band applications. Further enhancement of the antenna performance with improved design is under consideration.
Highlights
Recent advances in wireless communications, radar, satellite and space programs have introduced tremendous demands in the antenna technology (Mobashsher et al, 2010; Shakib et al, 2010a; 2010b; Azim et al, 2011; Islam et al, 2009a; 2010b)
Among the various type of antenna, microstrip antennas are of special interest because of their light weight, low profile, compactness and compatibility with integrated circuits, though they suffer from some drawbacks e.g., narrow bandwidth, low gain and excitation of surface waves (Garg et al, 2001; Azim et al, 2010)
Addition of defects into the periodical structure, exhibits the ability to reject the propagation of the electromagnetic waves whose frequency is included within their frequency band gap and to open localized electromagnetic modes inside the forbidden frequency band (Yablonovitch, 1987)
Summary
Recent advances in wireless communications, radar, satellite and space programs have introduced tremendous demands in the antenna technology (Mobashsher et al, 2010; Shakib et al, 2010a; 2010b; Azim et al, 2011; Islam et al, 2009a; 2010b). The communication devices had been emerged rapidly (Alam et al, 2009; Azim et al, 2011) To cope with this fast development in wireless technology, miniaturization of antenna with wideband and good radiation characteristics is very much desirable (Faruque et al, 2010; Islam et al, 2009b; 2010a). Design of an antenna with reduced size while maintaining good performance in the Industrial Scientific and Medical (ISM) band of 2.4-2.5 GHz is in our concentration This frequency allocation complies with the IEEE 802.11b Wireless Local Area Network (WLAN), Bluetooth and RF Identification Devices (RFID) applications. A simple and compact EBG microstrip antenna is proposed that is conformal with the short range and medium range wireless network operation It covers the frequency band of 2.34-2.59 GHz and this design could be adopted for single band WLAN/PAN applications.
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