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fabricated, and measured. Measurements verify that the insertion loss below Ϫ2 dB is from 3.5 to 4.2 GHz. This compact CPW bandpsss filter with good transmission performances is potential to high-density microwave CPW circuit applications. REFERENCES 1. V.G. Veselago, The electrodynamics of substances with simultaneously negative values of and , Sov Phys Usp 10 (1968), 509 -514. 2.

relatively high propagation loss of 3.5 dB/cm. Nevertheless, we have shown that BCB 4024 -40 polymer is a low loss material suitable for relatively short photonic devices and economically saved in terms of realization cost.