Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique

Substrate Integrated Waveguide (SIW) technique is a good candidate when designing a 3dB/90° coupler at high frequency as this technique exhibits low loss compared to traditional microstrip. In microstrip technique, some of the electric and magnetic field is propagating in the air (lower permittiv...

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