Our study concerns the analysis of K-band passive devices using a new technology, substrate integrated waveguide (SIW), by the HFSS code. This technology has been applied successfully to the conception of planar compact components for the microwave and millimeter waves applications. This application focuses on three components: A coupler junction (-3dB) used for routing, dividing and combining the signals in the microwave system. The levels of reflection and isolation below-15dB occupy more than 26.43% of the bandwidth, the insertion loss S 21 and coupling S 31 fluctuate between-3.24dB and-3.78dB, respectively. The SIW ferrite junction circulator has potential applications in integrated communication and radar systems. Its frequency response shows reflection losses below-15 dB in more than 21.75% of the bandwidth, an insertion loss about-0.65 dB, while the maximum of the isolation is-38.11dB. The T-junction SIW power divider (-3dB) indicates that levels of reflection below-15dB occupy more than 26.32% of the bandwidth. The transmission coefficients S 21 and S 31 are around-3.54dB, showing equal division of the power injected into port 1. In this paper, design considerations and results are discussed and presented.

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The Substrate Integrated Waveguide (SIW) [9] has been studied. Figure 1 illustrate the RSIW which is designed from two rows of periodic metallic posts connected to higher and lower planes mass of dielectric substrate. Figure 2 and 3 shows the similarity of the geometry and the distribution of the electric field between (RSIW) and the equivalent rectangular wave guide [2] [3]. In this paper, [10][11][12][13][14][15] GHz band RSIW components are proposed and optimized. They are essential for many microwave and millimeter-wave integrated circuits and telecommunication systems. FUNDAMENTAL RSIW CHARACTERISTICSFor designing (RSIW) (Figure 1) many physical parameters are necessary as d the diameter of holes stems, p the spacing between the holes and W spacing between the two rows of holes. Two rows of holes are drilled and metalized, making contact between the two metal planes of the dielectric substrate, permitting propagation for all modes TE n0 [5]. The lines of current along the lateral walls of the RSIW are vertical, the fundamental TE10 mode may be propagated. Electrical performance of RSIW and a conventional rectangular waveguide filled with dielectric of width W [4] are similar.

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