Title :
A vertically periodic defected ground structure and its application in reducing the size of microwave circuits
Author :
Lim, Jong-Sik ; Lee, Young-Taek ; Kim, Chul-Soo ; Ahn, Dal ; Nam, Sangwook
Author_Institution :
Appl. Electromagn. Lab., Seoul Nat. Univ., South Korea
Abstract :
The microstrip and coplanar waveguide transmission lines combined by a vertically periodic defected ground structure (VPDGS) are proposed. The slow-wave effect, equivalent circuit, and the performances are shown. As an application example, VPDGS is adopted in the matching networks of an amplifier for size-reduction. Two series microstrip lines in input and output matching networks of the amplifier are reduced to 38.5% and 44.4% of the original lengths, respectively, due to the increased slow-wave effects, while the amplifier performances are preserved.
Keywords :
coplanar waveguides; equivalent circuits; impedance matching; microstrip circuits; microwave circuits; periodic structures; slow wave structures; VPDGS; amplifier performances; coplanar waveguide transmission lines; equivalent circuit; input matching networks; matching networks; microstrip transmission lines; microwave circuits; output matching networks; series microstrip lines; size-reduction; slow-wave effect; vertically periodic defected ground structure; Coplanar transmission lines; Coplanar waveguides; Distributed parameter circuits; Equivalent circuits; Impedance matching; Laboratories; Microstrip; Microwave circuits; Periodic structures; Planar transmission lines;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2002.805941
