A novel dual-band two layered printed antenna for an internal laptop antenna for WLAN operation is presented. The antenna has a simple two layered structure consisting of a spiral strip. The proposed antenna has a low profile and can easily be fed by using a 50 Ω microstrip line. It is believed that the size of the antenna is about the smallest among the existing internal laptop antennas for 2.4/5 GHz WLAN operation. The antenna occupies a small area of 5 mm×12 mm on a combined FR4 and foam substrates. The simulated results are in good agreement with the measured results. Compact size, low cost, ease of fabrication and good radiation parameters respect to the previous designs are the most important advantages of the proposed antenna.
A dual-band bow-tie antenna for wireless local area network (WLAN) is designed at both the 2.4 and 5 GHz (IEEE 802.11b/g and 802.11a) WLAN bands. The design procedure involves obtaining a full resonance frequency in the 2.4 GHz band and then using Parasitic Elements to achieve a secondary resonance at the 5 GHz band. The proposed antenna can provide two separate impedance bandwidths of 800 MHz (about 30% centered at 2.4 GHz) and 1100 MHz (about 20% centered at 5.5 GHz), making it easily cover the required bandwidths for WLAN operation in the 2.4 GHz band (about 3.4% bandwidth required) and 5.2/5.8 GHz bands (about 13% bandwidth required). The antenna structure has a compact dimension of 45 mm × 35 mm when printed on a substrate of dielectric with a thickness of 1.58 mm and a relative permittivity of 2.2. The simulated radiation patterns are nearly omni-directional. The uniplanar nature, simple feeding technique and compact structure make it easy for modular design. Keywords: bow-tie antenna, dual band, WLAN Classification: Microwave and millimeter wave devices, circuits, and systems Lett., vol. 7, no. 3, pp. 557-560, 2008. [6] Y.-C. Lee, J.-S. Sun, M.-H. Hsu, and R.-H. Chen, "A new printed slot loop antenna with tunable strips for 2.4 and 5 GHz wireless applications,"
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