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Abstract
The transmission characteristics of the parallel strip lines (PSLs) are studied. Then a novel dual-band power divider using PSLs is introduced. It consists of four -form arms and one 180° phase swap structure. The
-form arms are capable of achieving ideal impedance matching at two different frequency bands with an arbitrary power dividing ratio
The 180° phase swap structure is frequency independent, which is used to obtain high port to port isolation. Theoretical analysis and general design procedure of this power divider with arbitrary
and
(central frequency ratio of two different frequency bands) are presented. Then, a sample operating at 1.3 and 3.5 GHz with
and
is fabricated and tested. Experimental results show that this power divider operates at the designed dual frequency bands, and the isolation is more than 20 dB. Good agreements among theoretical, simulated, and experimental results are obtained.
Acknowledgment
This work was supported in part by NSFC (No. 60901022), in part by RFDP (No. 20090185120005), and in part by the Fundamental Research Funds for the Central Universities (No. ZYGX2010J021).