Shiban K Koul, Indian Institute of Technology, Delhi

Recent Trends in Radio Frequency Electronics

Shiban K Koul
Shiban K. Koul

Indian Institute of Technology Delhi, Hauz Khas, New Delhi, E-mail:  shiban_koul@hotmail.com

In recent years there has been rapid changes in radio frequency (RF) techniques as well as technology. The trend is to use increasingly higher frequencies with their inherent advantages of smaller components and larger bandwidth. In particular, the use of planar circuit architecture and the integration of micro-machining technology has opened up new opportunities in terms of reduction in cost, weight, volume, power consumption as well as the extension of operating frequencies. In keeping with the advances in technology, the engineering design approach is also undergoing a rapid advancement by improved digital signal processing (DSP) techniques and CAD tools. Thus the scope of RF design techniques and technology, that was confined to lower microwave frequency bands (~10 GHz), has expanded to millimeter wave frequencies (30-300 GHz).

The talk presents different techniques and technologies for the design and development of Radio Frequency Integrated Electronic Circuits. Starting from the conventional microstrip, other key technologies including suspended stripline, dielectric integrated guides, LTCC and micromachining will be described. Design methodology leading to the development of several high performance components/subsystems at 35 GHz and 140 GHz is presented. The components reported are 26.5-40 GHz balanced mixer in microstrip, 18-40 GHz double balanced mixer using a novel balun structure, 140 GHz band pass filter and balanced mixer utilizing a novel suspended stripline structure, band stop filter and an oscillator utilizing a novel transition from suspended stripline to dielectric guide. Use of modern computer aided design (CAD) approach to design and develop different types of micro machined circuits including antennas will then be described. The circuits will include, MEMS switches, phase shifters and filter banks. Finally schemes for developing reconfigurable RF electronics circuits using MEMS switches are presented. The talk will end by describing emerging applications of Radio Frequency Circuits.

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