Advanced information and communication networks are constantly evolving to keep up with the popularity of mobile phones, personal computers, and the Internet. High frequency devices are becoming essential for wireless communications with higher speed and higher capacity to provide greater mobility for users.
a) Monolithic microwave IC (MMIC):
Micro wave communication is a most popular and widely used means of communication especially in the case of cell phones. The very fact that the microwave also travels with almost the same velocity as that of light, made this momentum possible. Microwave can penetrate earths atmosphere without loss and can travel all the way to mars and even further. Normally used microwave frequency range is around 3-300 GHz. And common source used was silicon transistor of 25 GHz as the source. Much more high frequency and compact sources of GaAs (50 GHz) and InP (180 GHz) are replacing the conventional sources currently. Transistors and passive parts are integrated into the same GaAs substrate provides high functionality and high performance in extremely high frequency (EHF), plus miniaturization by function integration. Demand is increasing for MMIC’s in fields of satellite communications, high-speed wireless access, and intelligent transportation systems.
b) Low Noise HEMT (High Electron Mobility Transistor)
Used for BS/CS broadcast reception; meets requirements for lower noise characteristics in a higher frequency for interactive digital satellite broadcasting systems. Lead-less structure provides excellent high frequency characteristics and stable performance.
c) High Power FET (Field Effect Transistor)
Used for transmission of terrestrial microwave communications and satellite communications, plus communications between base stations for cell phones and wireless Internet access. Their high power, high efficiency, and low noise are ideal for applications in base stations for high-speed and high capacity digital information, an expanding market.
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