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A Compact Single / Dual-Band Printed Inverted-F Type Antenna Structure

Abstract: In the first part of the paper a compact version of a printed inverted-F type antenna is presented. The compactness is achieved by placing the necessary matching line at the side of the feeding line with the main radiator not at the other side of the feeding line, as for the ordinary IFA. Another advantage is the possibility of an additional λ/2-resonance along the matching line, which is connected to the ground-plane over a via. By using the two first resonances a dual-band antenna can be designed that has been done in the second part of this paper. Our novel antenna structure is well suited for small mobile communication devices or PC-cards operating within the ISM 2.4 and 5 GHz bands. Bluetooth and the WLAN standards IEEE 802.11 a, b, g are the most important applications within the above mentioned frequency bands. The antenna structures have been optimized using a commercial FDTD tool. These designs have been validated with measurements on fabricated prototypes together with additional FEM-simulations.