A Wide-Band Equivalent Circuit Model for Single Slot Defected Ground Structures

Abstract

Defected Ground Structures have multiple applications in the microwave domain, e.g., in the design of couplers, antennas, filters and filtennas. An accurate wide-band equivalent circuit model is proposed for Defected Ground Structures in this paper. This wide-band model can be used to model multiple resonances of a Defected Ground Structure with a single slot. Validation through measurements verifies the accuracy of the proposed model.Index terms-Circuit modeling, Defected Ground Structure (DGS), slotlines.

An equivalent circuit model for wide‐band analysis of defected ground structures with asymmetric slot and multiple slots

“…Such a DGS is shown in Figure 1 (Middle). In Reference 7, we extended the equivalent circuit model from Reference 6 to a wide‐band model that is able to take into account multiple antiresonances.…”

“…This work contains two novel contributions, we: (1) model the wide‐band behavior of a slot that is positioned asymmetrically with respect to the transmission line, (2) model the wide‐band behavior of a DGS with multiple slots by taking the extra coupling between neighboring slots into account. The proposed circuit models aim to extend the modeling power of previously published circuit models 6,7 toward more complex physical electromagnetic phenomena. The radiation losses in our wide‐band model are described by a frequency‐dependent resistor instead of multiple resistors in case of the RLC‐tanks in References 4 and 5 making our model more parsimonious when modeling multiple antiresonances (of symmetric or asymmetric slots).…”

Parameter Extraction for Equivalent Circuit Model of RF Devices Based on a Hybrid Optimization Method

“…The proposed method may have some limitations: Firstly, although this hybrid optimization method accelerates the parameter extraction of RF devices, it still cannot solve the problem of parameter extraction in a very wide frequency band, since RF devices may have different properties in different frequency bands [20]. That is, one specific equivalent circuit model may not be able to match the physical model of a certain RF device in its entire frequency band.…”