A Parametric Study of a Waveguide Loop-Type Directional Coupler

A Directional Coupler is often used when measurements are done in microwave frequencies. However, directional coupler performance is inherently limited to a frequency range [1]. Recently, a waveguide loop-type coupler with a constant coupling value over a wide frequency band has been presented [2]. In the present study, the effect of each design parameter on the coupling performance will be analyzed for a loop-type coupler very similar to that in [2]. Despite the limitations, it will be shown that a directional coupler can be customized by changing several design parameters.