A Technique for the Size Reduction of RF/Microwave/Millimeter Wave Circuits for Wireless Communications By inserting Defected Ground Structure into the Matching Networks

摘要

How the present invention is to reduce the size of the defect ground structure (Defected Ground Structure, DGS) for having used that microstrip lines are carrying the propagation delay characteristic (Slow-wave chacteristics), RF / microwave / millimeter in a wave band amplifier circuit to be. Inserting a DGS in the ground plane under the microstrip line due to the inductor, the capacitor component of the equivalent showed a tendency to increase the characteristic impedance, while equivalently speaking characteristics, back to the effective dielectric constant increase appears that slow-wave characteristics the same physical even though the length, will increase the electrical length than the DGS not. Therefore, to the same as the electrical length of the previous insertion of the DGS, it is main surface by reducing the length of the line upon insertion of the DGS. By giving the insert a DGS in the transmission line within the matching circuit of the amplifier is designed based using this principle, reducing the length of the matching circuit, it is possible as a result kkoehal the size of the amplifier circuit.