CPW Broadside Coupler

This is a model for the coplanar wave, broadside parallel line coupler (BSCCPW). This can be TEM or quasi-TEM as per homogeneous or non homogeneous dielectric distribution in a stripline case.

Coplanar Wave Broadside Coupler

StripLine Coupler Diagram

Coplanar Wave Broadside Coupler

A reference load is required for calculation of the Quarter wave coupler characteristics (defaults to 50 Ohms).

For your 3db coupler you could start from: Substrate Er = 12.9 in air Er = 1, substrate 50u, plane gap 100u, track width 90u, shield spacing 10mm.