Development of Microwave Components Based on SIW Technology

Abstract

Microwave and millimetre-wave technology require the component development that provides good performance in terms of the losses, power handling capacity, low cost, weight, and fabrication complexity. Many techniques are used for the development of these components. Two of the most promising approaches in recent times for the component development are the conventional metallic waveguide and microstrip line structure. newlineConventional metallic waveguide provides the low losses, high-quality factor up to the millimetre-wave frequency. However, mechanical fabrication, development cost, size, and weight of the waveguide are the major limitations of this technique. On the other side, microstrip line development provides easy fabrication, smaller size. However, it has a lack of quality factor and power handling capacity. Substrate integrated waveguide (SIW) offers an alternative solution for both the technologies. A planar translation of the waveguide provides the high-quality factor, better power handling, and easy fabrication. This research work covers microwave components development using SIW technology. newlinev newlineFirstly, a bandpass filter using substrate integrated waveguide technology (SIW) is designed in this thesis for industrial, scientific and medical (ISM) band frequency (5.7 5.9 GHz) application. The designed structure provides passband from the frequency range of 5.72 GHz to 5.84 GHz with the insertion loss of 0.7 dB and return loss of more than 25 dB. This filter is developed for the frequency modulated continuous wave radar (FMCW) radar application. newlineA phased lock loop (PLL) system with the integration of the SIW based bandpass filter for the D band microwave interferometer is also developed in this research work. It provides the development and implementation of a low phase-noise stable signal generator for a D-band microwave interferometer application used in the fusion plasma diagnostics. The integration of SIW technology with active component is demonstrated. newlineHalf mode substrate integrated waveguide (HMSIW) -bas