Microstrip Circuits with a Modified Ground Plane

Download Whitepaper
  • Author: Leo G. Maloratsky
Different microstrip circuits with modified ground plane are considered in this article. The ground plane aperture (GPA), ground plane lossy aperture (GPLA), and defected ground structure (DGS) provide numerous advantages for microstrip elements and devices. DGS resonators find application in a large number of microstrip circuits where a frequency notch can reduce complexity and enhance performance. GPA is mainly used to increase the impedance in a section of a microstrip, allowing higher impedance lines and higher Q printed inductors. The applications of the GPA and GPLA include termination, attenuator, LPF, directional coupler, phase shifter, and Wilkinson divider.