Modeling stepped U‐slot DGS microstrip line. Issue 3 (March 2016)

• Record Type: Journal Article
• Authors: Woo, Duk‐Jae; Lee, Taek‐Kyung; Nam, Sangwook
• Is Part Of: Microwave and optical technology letters. Volume 58:Issue 3(2016:Mar.)
• Page Start: 583
• Page End: 587
• Publication Date: 2016-03
• Subjects: U‐slot DGS -- stepped impedance CPW -- equivalent circuit model; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.29626
• Languages: English
• ISSNs: 0895-2477

Abstract

ABSTRACT: This paper presents an equivalent circuit model for a stepped U‐slot defected ground structure (DGS). For a stepped U‐slot DGS, the defected structure is simply modeled using a short‐circuited stepped impedance coplanar waveguide (CPW) combined with a gap capacitor. The proposed circuit model is advantageous in its ability to accurately control the ratio ( η = fs 1 /fr ) of the fundamental resonance frequency ( fr ) to first spurious resonance frequency ( fs 1 ) by changing the impedance and the electrical length of the CPW in each step. By using this property, two types of resonators with normalized first spurious resonance frequencies ( η = fs 1 /fr ) of 4 and 2 were designed and fabricated. Good agreement between the EM simulations and the experimental results were achieved. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:583–587, 2016