Small Broadband Antenna Designs for 3G Handset Applications

Abstract

Dua reka bentuk antena set tangan yang diperbaiki, kecil, padat dan berjalur lebar bagi jalur 3G berdasarkan kaedah tompok gandingan–sela dan FS–PIFA dibentangkan. Antena gandingan–sela sesatah tompok tersongsang (IGCC) dan satah bumi terhingga satah tersongsang–F terpintas–penuh (FFS–PIFA) disimulasi dengan menggunakan simulator Zealand IE3D 8.2 em. Hasil simulasi memberikan pecahan lebar jalur sebanyak 28.2% dan 40.1% pada kehilangan balikan 10 dB bagi reka bentuk IGCC dan FFS–PIFA masing–masing. Reka bentuk IGCC difabrikasi kerana ia mudah difabrikasi. Hasil pengukuran bagi IGCC memberikan pecahan lebar jalur sebanyak 31% pada 10 dB pada f_c = 1.95 GHz dengan gandaan 4 dBi. Dimensi tompok bagi kedua–dua antena ialah 33 × 32 mm dengan satah bumi bersaiz 40 × 60 mm. Antena ini sesuai bagi aplikasi 3G. Kata kunci: Antena set tangan, antena tompok microstrip, satah tersongsang F, gandingan sela, IMT- 2000 Two improved, small, compact, and broadband handset antenna designs for 3G band based on gap–coupled patch and FS–PIFA techniques are presented. The antennas, the Inverted Gap–Coupled Coplanar patch antenna (IGCC) and Finite ground plane Full–Shorted Planar Inverted–F Antenna (FFS PIFA) are simulated using Zealand IE3D 8.2 em simulator. Simulation results give fractional bandwidths of 28.2% and 40.1% at 10 dB Return Loss for IGCC and FFS–PIFA respectively. The IGCC was fabricated due to its simple fabrication. Measured results for IGCC gave a fractional bandwidth of 31% at 10 dB Return Loss at f_c = 1.95 GHz and with 4 dBi gain. The patch dimensions for both antennas are 33 × 32 mm with a ground plane size of 40 × 60 mm. These antennas are promising for 3G applications. Key words: Handset antenna, microstrip patch antenna, inverted-F, gap-coupled, IMT-2000