The design and resonance analysis of small antenna for mobile applications

Abstract

In this dissertation we are proposed and designed novel ceramic dielectric antennas, printed antennas for Dual-ISM band, a broadband sleeve antenna, and a broadband double-ridged horn antenna. And our antenna measurement system for small antenna is presented. First of all, broadband and multi-band ceramic dielectric antennas by using material perturbation method and advanced meander line technique are described, respectively. The broadband dielectric antenna using material perturbation method has a wide bandwidth of up to 25 % and omni-directional radiation patterns. This proposed DRA is designed to extend enough the coverage of PCS/IMT-2000. For the application of Bluetooth and dual-ISM band, novel chip type dielectric antenna are presented and analyzed. This dielectric antenna can be effectively reduced its volume by using the advanced meander line technique. The proposed antenna dimension is 8 mm $\times$ 4 mm $\times$ 1.5 mm and is mounted on the substrate (FR-4, TMM-4) with thickness of 1.0 mm, 1.52 mm, respectively. The operating frequency is in the range of 2350-2570 MHz and 5290-6010 MHz, and the antenna gains have maximally 1.0-2.65 dBi. Second of all, a compact and novel planar inverted F antenna (PIFA) is proposed and implemented. The proposed printed antenna exhibits good impedance bandwidth as well as radiation performance despite the miniaturized volume of 20 mm $\times$ 23.7 mm $\times$ 0.8 mm (FR-4). The impedance bandwidth with 10 dB return loss is about 150MHz (2380-2530 MHz) for 2.4 GHz band and 1450 MHz (5130-6580 MHz) for 5 GHz band. The measured radiation patterns were approximately omni-directional and yield a gain of 1.0 dBi at 2440 MHz and 3.98 dBi at 5600MHz, respectively. Third of all, a compact and broadband printed dipole antenna for dual ISM-band applications is introduced. The impedance bandwidth with 10 dB return loss was about 220 MHz (2350-2570 MHz) for 2.4 GHz band and 1360 MHz (4900-6260MHz) for 5 GHz band. The measur...