Design and Simulation Verification of New Miniaturized Dual-frequency Microstrip Antenna

Because of the problem that the global positioning system (GPS) fails to locate subjects owing to the occlusion of satellite signals in some environments, a combined navigation and positioning scheme based on GPS and digital television multimedia broadcasting (DTMB) was proposed. The design process of a dual-frequency microstrip antenna was described in detail. Our simulation showed that the return loss was less than -10 dB, and the antenna had three resonance points, namely, 0.69, 1.55, and 1.78 GHz, with working frequency bands of 0.68-0.70, 1.54-1.58, and 1.77-1.79 GHz, respectively. These results proved that the dualfrequency microstrip antenna could simultaneously receive GPS and DTMB signals, and that the antenna was a circularly polarized antenna with single-point feeding and excellent radiation characteristics and strong practicability. In addition, the particle filter (PF) algorithm was applied to the combined positioning scheme, and the dynamic tracking effect of such an algorithm was simulated under different particle numbers. Simulation results showed that the filter tracking trajectory was close to the real trajectory, and that the higher the number of particles, the higher the positioning accuracy. This research verified the feasibility of navigation and positioning based on GPS and DTMB.