A Compact Low-Profile and Quad-Band Antenna With Three Different Shaped Slots

Abstract

Abstract-A compact quad-band slot antenna is presented in this paper. The proposed antenna consists of ground plane, dielectric material and top radiation patch. Firstly, symmetrical L-shaped slots are inserted in a radiation patch. Then to achieve multiband performances, symmetrical square spiral slots and a snakelike area with two symmetrical arms enclosed by a long slot in the ground plane are adopted. The process of design and parametric studies are illustrated in detail. The final quadband antenna has a small size of 0.22λ g × 0.28λ g = 17 × 22 mm 2 (where λ g is the guide wavelength) and covers the frequency bands from 2.39 to 2.48 GHz for lower WLAN, 3.64-3.73 GHz for downlink and 5.98-6.30 GHz for uplink standard satellite communications, and 6.97-7.18 GHz mainly used by the Indian National Satellite System (INSAT). The measured results of the proposed quad-band antenna are in accordance with simulated analysis and show good performance of return loss characteristics, radiation patterns, bandwidths and gains. Especially, with a very small size, the proposed antenna is suitable to be integrated with a portable device for varieties of wireless communication applications.

Stepped Slot Patch Antenna With Copper Ground Plane and Solar Cell Ground Plane for Future Mobile Communications

“…A modified π-shaped slot loaded multifrequency microstrip antenna is presented [8] and resonates at 3.3, 4.55, 5.56, and 6.08 GHz in microwave S and C bands. A compact low-profile and quad-band antenna with three differently shaped slots, suitable to be integrated with a portable device for varieties of wireless communication applications is presented [9] and covers frequency bands from 2.39 to 2.48 GHz for lower WLAN, 3.64-3.73 GHz for downlink, and 5.98-6.30 GHz for uplink standard satellite communications, and 6.97-7.18 GHz mainly used by the Indian National Satellite System. A low-profile and broadband slot antenna with artificial magnetic conductor (AMC) surface is designed [10] for X and Ku communication, which improves the radiation and impedance matching properties of the broadband slot antenna.…”