Design of Internal Dual Band Printed Monopole Antenna Based on Peano-type Fractal Geometry for WLAN USB Dongle

摘要

This paper introduces the design of a new dual-band internal printed monopole antenna structure as a candidate for WLAN (wireless local area network) USB (universal serial bus) dongle applications. The proposed antenna structure is based on the second iteration of Peano- type space-filling geometry. The antenna has been printed on a substrate with relative permittivity of 2.33 and thickness of 0.8 mm, and fed with 50 Ω microstrip line. The resulting antenna has been found to possess a compact size of 15 mm × 5.6 mm, which is suitable for this application. Furthermore, the proposed antenna offers a dual resonant behavior with frequency ratio of about 2.41; resulting in bandwidths, for return loss ≤ -10 dB, covering the two WLAN band standards. Modeling and performance evaluation of the proposed antenna have been carried out using the CST Microwave Studio. Simulation results of return loss, radiation patterns, and gain verify that the presented antenna represents a good solution for dual-band WLAN USB dongle applications.