Design of Miniaturized Symmetric Microstrip DC Block

This paper suggests DC blocks that have the length of one-eighth wavelength. The miniaturized dc block is completed by that gap of coupled line is reduced to increase an amount of coupling. These dc blocks not only suppress harmonics but also their sizes are smaller than general dc blocks. To verify performance of the miniaturized dc blocks, several dc blocks are designed and fabricated. These dc blocks are applied in PLDRO operating at 6.3 GHz.