This paper describes about multipurpose, band specific antenna design for a wireless authentication device. Various design challenges are discussed for the antenna development as related to the product design. Specific tuning methods for different types of antenna are illustrated with a brief overview of the antenna selection possibilities. This authentication device has three band-specific antennas for 900MHz GSM/GPRS, 2.4GHz Wi-Fi and 1.5GHz GPS frequency bands. In this paper, design possibilities for GSM/GPRS antenna is proposed and one of the antenna design was carried out with the available space constraints and better than 50% efficiency has been achieved.

In this paper, the design requirements, design procedure, and performancc of a low noise amplifier (LNA) used in wideband code division multiple access (WCDMA) base station receiver, is illustrated. The amplifier design is aimed for a directconversion architccrurc. It simultaneously achieves good inputmatch, ultra-low noise figure and high linearity hi terms of low lliird order intermodulaiion (IMD3). The LNA achieves an overall gain OF 55 dB, noise figure (NF) better than 0.7 dB, IMD3 Icss than -67 &e. Devices used are E-pHEMT type with gate widths of 800um and 64ooum. Distribuled type quadraturehybrid is used for balanced confipralion with good amplitude and phase balance.

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