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In this paper a new strategy for designing dualband composite right and left handed (CRLH) structures based on lumped elements is introduced. By using the presented formulars the desired metamaterial devices become easily scalable to arbitrary frequencies as the parasitic elements of the lumped components are considered resulting in three design guidelines. The practical use is shown by a dualband...
Recently, very compact filters have been realized in suspended stripline using a lumped element approach. In this paper, a similar approach is used to realize very small 3 dB hybrid couplers. Two examples at 1.3 GHz and 6.8 GHz are presented, resulting in relative bandwidths of 5% to 10% (at -15 dB isolation) and quite low insertion loss. For the 1.3 GHz and 6.8 GHz range, these couplers are realized...
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