Microstrip Directional Couplers

Let us consider two parallel microstrip lines that are placed so close to each other that the fields of the lines couple to each other. Then a wave propagating in one line can excite a wave in the other line. The fields of a coupled line can be presented as a superposition of an even mode and an odd mode, shown in Figure 6.9. In case of the even mode the currents of the lines are equal and in the same direction in case of the odd mode they are equal but in the opposite directions. A coupled...

Reflection and Transmission at a Dielectric Interface

Oblique Incidence Parallel Polarization

Let us consider a plane wave that is incident at a planar interface of two lossless media, as illustrated in Figure 2.7. The wave comes from medium 1, which is characterized by 1 and 1, to medium 2 with 2 and 2. The planar interface is at z 0. The angle of incidence is d1 and the propagation vector k 1 is in the xz-plane. Part E from the incident field is reflected at an angle d and part E2 is transmitted through the interface and leaves at an angle of 62. Figure 2.7 Reflection and transmission...