A 5.7 GHz low noise ultra high gain CMOS LNA with inter stage technique is presented in this paper. The noise and gain performance is improved using common-source transistor inter stage network. A bias resistor of large value is placed between source and the body node to prevent body effect and reduce noise. The simulated 0.18 μm CMOS LNA achieves −14 dB and −17.5 dB input and output return loss respectively. Compared to previously published currentreused LNA, the proposed LNA has the smallest noise figure of 1.85 dB, extremely high gain 32.5 dB, and the highest Figure of Merit of 87.28.

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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," References