A STACKED SIERPINSKI GASKET FRACTAL ANTENNA WITH A DEFECTED GROUND STRUCTURE FOR UWB/WLAN/RADIO ASTRONOMY/STM LINK APPLICATIONS

作者：Kaur Amanpreet^*; Khanna Rajesh; Kartikeyan Machavaram V

来源：Microwave and Optical Technology Letters, 2015, 57(12): 2786-2792.

DOI：10.1002/mop29442

• stacked MSA
• aperture coupled MSA
• impedance bandwidth
• gain
• radiation pattern
• wireless local area network
• ultra wide hand
• radio astronomy
• STM Link

An aperture coupled stacked Sierpinski gasket fractal antenna with a defected ground structure is proposed in the current article for ultra wide band (UWB) and wireless local area network (WLAN) applications. The radiating structure is formed of two Sierpinski gasket fractal patch antenna layers on two layers of FR4 substrate stacked one over the other. This stacked structure is fed by a third (bottom) layer also of FR4 substrate, with ground layer at its top and the feed line with a stub, at the bottom. The top ground layer has a 'dagger' shaped slot cut in it to provide a wideband behavior to the antenna, and the feed line is designed with a stub to provide circular polarization to the EM fields radiated by the proposed antenna. The antenna is designed using CST Microwave Studio version 2010 assuming perfect boundary conditions. The proposed antenna shows a dual band wideband behavior with an impedance bandwidth of 630 MHz (4.75-5.38 GHz) and 400 MHz (6.8-7.2 GHz) with a gain of 5.85 dB and 9.5 dB at the center frequencies of the two bands, respectively. The antenna is capable of covering two UWB bands from (4.75-5.28) GHz and (6.8-7.2) GHz, a radio astronomy band from (5.01-5.03) GHz and IEEE 802.11a band from (5.15-5.35) GHz The prototype of the proposed antenna is tested using a VNA and an anechoic chamber to validate against the simulated results. The proposed antenna has volumetric dimensions of 6 x 6 x 0.483 cm(3) which makes it a suitable choice for RF front end circuits.

• 出版日期2015-12