In this paper, a new idea of reconfigurable 3 6 dB branch line coupler is proposed.
The proposed coupler is tuned through a simple open and short circuit at
the coupler’s branches’ edges. At the short edges case, a 3 dB branch line
coupler is obtained. In this case, the coupler’s branches are considered as microstrip
transmission lines with 0.3 mm slot width which is etched in each
coupler’s branch. At the open edges case, the coupler’s branches are considered
as asymmetric coupled microstrip lines. In this case, a 6 dB branch line
coupler is obtained. Both CST and IE3D simulators are used to optimize the
reconfigurable 3 6 dB branch line coupler dimensions. As a prototypes, two
BLCs are designed, analyzed and tested at the “on” and “off” states at 2.5 GHz.
The measured S-parameters confirm the proposed concept of the reconfigurable
3 6 dB branch line coupler.