Abstract
Normally the physical dimensions of the taper transition that realizes the impedance matching between the impedance of the feeding line built in microstrip line technology and the impedance of the component built in Substrate Integrated Waveguide (SIW) technology are obtained by computational optimization processes due the difficulty of analytical treatment. This research work presents a new empirical approach to determine all the physical dimensions of this particular planar transition without using any computational optimization process. The well-defined design procedure is based on an approximation according with electromagnetic simulations and electromagnetic theory. The main goal is to facilitate the integration between SIW technology and planar circuits. The whole design procedure considers central frequency for the recommended bandwidth in the TE10 propagation mode and power-voltage impedance definition for the SIW. Two structures are designed on RT/duroid 5880 to operate in the X band and Ku band, and the frequency response for both structures are compared by electromagnetic simulation and experimental results. The structure operating in X Band demonstrated return loss better than 10.0 dB at 61.67% of the considered bandwidth and the structure operating in Ku Band demonstrated return loss better than 10.0 dB at 72.88% of the considered bandwidth.
Highlights
Rectangular Waveguides (RWG) are widely applied in the microwave frequencies due a low power dissipation and high quality factor
Will be shown that a mean error lower than 6% is present when is taken a unique effective dielectric constant value for the taper transition and feeding line, and a mean error lower than 7% is present in the impedance matching between the taper transition and the Substrate Integrated Waveguide (SIW) component considering the proposed approximation
Both equations obtained in this research work can be directly applied to determine in an easy way the physical dimensions l2 and w2 of the taper transition, providing the impedance matching between the impedance of the feeding line and the impedance of the SIW component
Summary
Rectangular Waveguides (RWG) are widely applied in the microwave frequencies due a low power dissipation and high quality factor. Shows as disadvantage a high fabrication cost and the integration with planar circuits require sophisticated transitions. To avoid these problems, has been proposed a structure called Substrate Integrated Waveguide (SIW). The components built using SIW technology are designed and fabricated on a planar dielectric substrate low losses and having periodical metalized vias that replaces the side walls of the traditional RWG, confining the electromagnetic wave inside the dielectric substrate, allowing in this way an easy integration with planar circuits [1].
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