DIRECTIONAL COUPLER AND WIRELESS COMMUNICATION APPARATUS COMPRISING THEREOF

摘要

The present invention relates to a directional coupler 1 structured with a microstripline 20 including a main line 2 having an input port P1 and an output port P2, and a sub line 3 having a coupling port P3 and an isolation port P4. The sub line 3 is made of a high impedance line 4 narrower than the main line 2. The high impedance line 4 has first coupling lines 5A and 5B and a second coupling line 6 each extending in parallel to the main line 2. The distance between the first coupling lines 5A and 5B and the main line 2 is smaller than the distance between the second coupling line 6 and the main line 2.