Abstract
The paper represents the compact hybrid backward wave branch line
coupler resonating at 2.68GHz suitable for various applications due to
the relatively wide bandwidth (2.14-2.95GHz).The proposed design is
simulated utilizing Sonnet Suites Software and the simulated results are
in close match with the measured data obtained after the fabrication of
the coupler. Furthermore, the S parameters of both simulated and
measured results are in the acceptable range. The input match and
isolation factor are approximately -30.31dB, whereas coupling factor and
insertion loss are around -3.01dB respectively. In addition, the FR-4
dielectric substrate (er = 4.4) with the thickness of 1.55mm is used for
the proposed design despite the tangent losses of the FR-4 substrate.
The given design is somewhat inexpensive, having a very simple geometry
and reliable with a wide bandwidth, it can be used in numerous microwave
technological applications.