In this paper, a wide stopband low-pass filter (LPF) is proposed using the one-cell triangle and cascaded triangle defected ground structure (DGS). In this proposed structure, no coupling load is applied. The performance characteristics of the proposed low-pass filter were studied in both electromagnetic and equivalent simulations for the one-cell and cascaded triangle DGS. The equivalent circuit of the proposed low-pass filter is extracted with the help of electromagnetic (EM) simulation. The proposed low-pass filter is analyzed with both EM and equivalent simulations using the HFSS and ADS FEM tools, respectively. The performance characteristics of the proposed one-cell triangle arrowhead, such as cut-off frequency, stopband attenuation at the resonance frequency, passband width, stop bandwidth, and insertion losses, are 14 GHz, − 29 dB, 11.4 GHz, 15.5 GHz, and < 0.2 dB, respectively. Additionally, the performance characteristics of the 3-cell triangle arrowhead, such as cut-off frequency, stopband attenuation at the resonance frequency, passband width, stop bandwidth, and insertion losses, are 17.4 GHz, − 28 dB, 13.5 GHz, 20.1 GHz, and < 0.12 dB, respectively. The proposed structure shows good agreement between both EM and equivalent simulations. With this, the proposed LPF structure is utilized in wide stopband applications for satellite and radar communications.
