E Plane junction:

Explanation:

• The E-plane tee is a voltage or series junction.
• Each junction is symmetrical about the central arm, so that the signal to be split up is fed into it or signals to be combined are taken from it.
• Some form of impedance matching is required to prevent unwanted reflections. (When mode is made to propagate into port 3, the two outputs at port 1 and port 2 will have a phase shift of 180° as shown in figure (a.)).
• Also, when powers entering port 1 and 3 are in phase opposition, maximum energy comes out of port 2.
• An input at port 2 equally divides between ports 1 and 3 but introduces a phase shift of 180° between the outputs. Hence E-plane Tee also acts as a 3dB splitter.

• H plane Tee is so called because the axis of side arm is parallel to planes of H-field of main transmission line.
• As all three arms of H plane tee lay in the plane of magnetic field,the magnetic field divide itself in arms this is thus the current junction.
• Since the electricity is not bent as the wave passes through a Hplane junction but merely divide between two arms ,fields of same polarity approaching the junctionfrom two main arms produce component of electric field that add in side arm.
• The effective valve of field leaving through the side arm is proportional to phasor sum of entering fields.