Abstract:
This paper presents, the analysis and design performance of a high impedance tunable
left handed coplanar waveguide transformer designed on a ferrite substrate. The
performance of the proposed transformer is explained analytically. Then numerical
electromagnetic full wave simulations verify its theoretical behavior. The results
illustrates that the proposed transformer can match a 200 load and a 50 line. The
whole operating bandwidth can be tuned by changing the applied DC magnetic bias.
The center frequency changes from 2.8 GHz to 3.4 GHz. The proposed transformer
length is only 2.4 mm which is approximately 78% reduction in conventional RH
transformer length operates within the same frequency band. Moreover, the proposed
transformer utilizes a horizontally magnetized ferrite substrate yielding a small
demagnetization field and hence smaller required DC magnetic bias compared to
microstrip configuration.