Chip Antenna Using Three Branch Structures and Interdigitated Gap Feeding

This paper proposes chip antenna using three branch structures and interdigitated gap feeding method. Three branches consist of the spiral, straight monopole, and meander structure. Antenna has a compact size of 20 x 8 x 3.2 mm . Its size is minimized so that it can be easily installed to mobile handset. FR-4 (relative permittivity = 4.4) substrate is used in this chip antenna. In this paper, interdigitated gap feeding technique is proposed. By the adoption of this structure, the proposed antenna can be alleviated a reduction of bandwidth as well as easily controlled a resonant frequency. This antenna is designed to operate at penta band, GSM900/GPS/PCS/WCDMA/Bluetooth. VSWR and radiation patterns are measured by using a network analyzer and a anechoic chamber respectively.