Design Equations for a Coupled-Line Type Filtering Power Divider

We derive the design equations for a coupled-line type filtering power divider. With the design equations that give analytical solutions to the design parameters, the power divider can be designed for a desired two-pole Chebyshev or Butterworh bandpass response. The power divider stands out from those in the literature, by both simple design procedure and layout. The design procedure using the derived equations is demonstrated with two proof-of-concept prototypes, fabricated on a 20-mil-thick RO4003C substrate.