Microstrip lowpass filter with wide stopband and sharp roll-off using modified radial stub resonator. Issue 3 (10th May 2016)

• Record Type: Journal Article
• Authors: Hayati, Mohsen; Khodadoost, Mehrnaz; Abbasi, Hamed
• Is Part Of: International journal of microwave and wireless technologies. Volume 9:Issue 3(2017)
• Page Start: 499
• Page End: 504
• Publication Date: 2016-05-10
• Subjects: Microstrip lowpass filter, -- Radial stub resonator, -- Sharp roll-off, -- Wide stopband; Wireless communication systems -- Periodicals; Microwave circuits -- Periodicals; Radio frequency -- Periodicals; 621.381305
• DOI: 10.1017/S1759078716000556
• Languages: English
• ISSNs: 1759-0787

Abstract

Abstract : In this paper, a microstrip lowpass filter with wide stopband and sharp roll-off is presented. The proposed filter consists of a modified radial stub resonator which is cascaded by four suppressing cells. To reduce the overall size, the transmission lines are folded. The cut-off frequency of the proposed filter is 1.19 GHz. The transition band is approximately 0.2 GHz from 1.19 to 1.39 GHz with corresponding attenuation levels of 3–20 dB. The stopband is from 1.39 to 19 GHz with attenuation level of <20 dB. The insertion loss and return loss in the passband from DC to 0.8 GHz are better than 0.26 and 14 dB, respectively. The proposed filter is fabricated and measured. The simulated and measured results are in good agreement.