Substrate Integrated FMCW Radar System Using SIW Technology

Abstract

The next-generation wireless communication systems require the filters, power dividers and antennas, which should have low-cost, high-performance, low insertion loss and higher power handling capacity.The microstrip lines and metallic waveguides are widely used for the designing of RF and Microwave components from decades as they are highly efficient electromagnetic performance with fewer losses. Power handling capacity is less and losses are more in microstrip lines, while waveguides are bulky and expensive. Nowadays, Substrate Integrated Waveguide (SIW) technology attracts many researchers in the field of electromagnetics and microwave communication due to high power handling capacity, low insertion losses, light weight, low fabrication cost and efficient high frequency characteristics. SIW is a state of the art technology, containing dielectric substrate embedded with two linear arrays of metalized vias connecting the upper and lower metallic plates. This technology provide the advantages of waveguide like low insertion losses and high power handling capacity along with demanding properties of microstrip lines like low-cost, small size and easy fabrication. newlineSIW based filters are designed and implemented using the defected ground structure (DGS), split ring resonator (SRR) and inductive post based filter design techniques. DGS is periodic or non periodic featured cells on the ground metal surface of planar circuit boards, which changes the field distribution and generates resonance; it has good band rejection characteristic. DGS cell shows a bandgap characteristic at particular frequency, which is mainly attributed by a finite attenuation pole. SIW based highly selective filter is designed by placing the inductive posts at multiple of guided wavelength. The signal inserted at a port one bounces back and forth between the posts, it generates resonance at a particular frequency. Hence, in this way it is possible to make SIW structure to work as a resonator. Frequency tuning is also possible in the proposed struct