No abstract

In this work, a planar beam switching antenna is proposed for wireless communication used in automotive environment. By integrating a Yagi patch antenna array with a one-to-four RF switch, RF power can be delivered to four different driven patch elements and generate directive beams toward different directions. The prototype antenna is designed to operate at the GSM 1800/1900 MHz band for cellular phone uses. The size and height of the fabricated antenna are 293 mm by 293 mm by 3 mm, respectively. Measurement results indicate the antenna's gain is approximately 9.478 dBi with a 3 dB beamwidth of 68 • .

A compact WLAN/Wi-MAX chip antenna for mobile phone applications is presented in this paper. Two chip antenna designs are proposed. One is for WLAN (2.4 ∼ 2.48, 5.15 ∼ 5.35, 5.725 ∼ 5.85 GHz) and Wi-MAX (3.4 ∼ 3.7 GHz). Its dimensions are 3 mm × 9 mm × 1.6 mm. The other is for WLAN (2.4 ∼ 2.48, 5.15 ∼ 5.35, 5.725 ∼ 5.85 GHz)/Wi-MAX (2.5 ∼ 2.7 GHz). The dimensions are 3 mm × 11 mm × 1.6 mm. The antenna configuration of the two designs comprises two resonant branches. Not only the fundamental mode but also the second order resonance are utilized. Furthermore, the meander line structure is used to create two adjacent resonant frequencies to achieve a tri-band operation. Measurements of the return loss and antenna patterns were performed. The measured result shows good agreement with simulated ones. The main advantage of the proposed chip antenna is that it doesn't require a guard region from other circuit components and is therefore attractive to mobile devices.