Reconfigurable bandstop to allpass filter using defected ground structure in K-band for millimeter-wave communications

Adib Othman (Fakulti Teknologi Kejuruteraan Elektrik dan Elektronik (FTKEE), Universiti Teknikal Malaysia Melaka (UTeM), Malaysia)
Noor Azwan Shairi (Universiti Teknikal Malaysia Melaka (UTeM))
Huda A. Majid (Universiti Tun Hussein Onn Malaysia (UTHM), Malaysia)
Zahriladha Zakaria (Universiti Teknikal Malaysia Melaka (UTeM))
Imran Mohd Ibrahim (Universiti Teknikal Malaysia Melaka (UTeM))
Mohd Haizal Jamaluddin (Universiti Teknologi Malaysia (UTM), Malaysia)
Anwar Faizd Osman (Rohde & Schwarz Malaysia Sdn. Bhd., Shah Alam, Selangor, Malaysia.)

Indonesian Journal of Electrical Engineering and Computer Science
Vol 28, No 2: November 2022

In this paper, a reconfigurable bandstop to allpass filters using Defected Ground Structure (DGS) in K-Band for millimeter-wave communications is proposed. Mathematical analysis of the DGS is discussed in this paper for the bandstop and allpass responses. The reconfigurable filter is performed by using an ideal switch with open circuit and short circuit conditions on DGS at several locations. Hence, two filter designs with different DGS are investigated for their performance in both simulation and measurement. As a result, the ideal switch at location S3 gives the best performance for both DGSs with a narrowband bandstop response and a wideband allpass response with insertion loss of less than 1 dB and return loss of more than 10 dB at the 26 GHz band. Hence, the proposed reconfigurable filter is suitable for millimeter-wave front-end communications.