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Design of microstrip hairpin bandpass filter for 2.9 GHz – 3.1 GHz s-band radar with defected ground structure. Mal. J. Fund. Appl. Sci. [Internet]. 2019 Jan. 6 [cited 2026 Sep. 21];14(4):448-55. Available from: https://mjfas.utm.my/index.php/mjfas/article/view/1073