For low microwave band, the size of substrate integrated waveguide (SIW) couplers still need to be further reduced though other advantages of low profile, low insertion loss, low cost etc. are very ...

The directional couplers are important microwave devices. There are many different types of couplers. The common ones are strip line coupler and waveguide coupler. In practical applications, couplers ...

Abstract The difference between phase velocities of the odd and even modes in inhomogeneous microstrip coupled lines makes the microstrip directional coupler a poor device regarding directivity. In ...