DUAL BRANCH AND PARALLEL COUPLED MICROSTRIP DIRECTIONAL COUPLER

The dual branch directional coupler consists of the main line, the side line and the two branch lines, the length and the distance of the branch line are 1/4. The main entrance line characteristic impedance design “as the main line, the characteristic impedance of export” II “as (k for impedance transformation ratio), side line isolation end” the characteristic impedance of the line side, “the end of the coupling impedance”, characteristic impedance in parallel with the line Z0p, two a branch line impedance and respectively.

Parallel coupled microstrip directional coupler is a reverse directional coupler, the coupling and the output end of the main input end on the same side, as shown on the right, port in as input port, port out through port, port ocup as coupling port “4″ for export, export quarantine.