III-3HOIII-3. Impedance Matching with Transmission Lines(1) Transmission Lines for Planar Circuits-(1) Microstrip Lines- inhomogeneous structure (air above and dielectrics below microstrip line) Maxwell eqn and boundary condition > longitudinal component of E, H field of dominant mode > quasi-TEM mode (hybrid mode)γ = ( R + jωL)(G + jωC ) = α + jβ ,vp = 1 = LC 1 = c = cβ = ω LC =, λg =2πλgΖ0 = R + j ωL 1 ≈ vp L = G + j ωC v pCεrε rεrλ0 , εrICE651 MMIC DesignIII-3-1III-3. Impedance Matching with Transmission Lines(1) Transmission Lines for Planar Circuits-(2) Slotlines- signal transmission by TE mode - implementable in the ground plane of microstrip line circuits for design flexibility and some new type of circuits (hybrid coupler) - confine the fields near the sl……
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