| 摘要 |
A directional coupler having coupled striplines provided between ground planes includes dielectric layers having a dielectric constant greater than the dielectric constant of air interposed between the stripline conductors and each of the ground planes, thereby equalizing the propagation velocity of the odd and even modes to improve the directivity of the coupler. A planar termination for a coaxial conductor provides a soft mode change from the coaxial transmission mode to the TEM suspended substrate planar mode of the resistive element in the termination by inserting a planar resistive element into a slot in the coaxial conductor. The soft mode change reduces the reflections associated with a mode change, providing a planar termination which is easier to design and fabricate than a coaxial termination to be utilized. A planar termination for a stripline supports the stripline when used in a directional coupler and has a planar resistive element rotated ninety degrees with respect to the plane of the stripline so that there is no mode change between the stripline and the planar resistive element.
|
