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All Journal Jurnal Elektronika dan Telekomunikasi
Fajri Darwis
Research Center for Telecommunication, National Research and Innovation Agency
Electrical & Electronics Engineering Engineering

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Cross-Coupled Line Bandpass Filter Based on Modified Parallel-Coupled Line Structure Fajri Darwis; Enjel Al Birr Rahayu; Sutrisno Sutrisno; Hanny Madiawati; Taufiqqurrachman Taufiqqurrachman; Arie Setiawan; Erry Dwi Kurniawan; Yusuf Nur Wijayanto
Jurnal Elektronika dan Telekomunikasi Vol 22, No 1 (2022)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jet.474

Abstract

This paper presents a study of a narrow bandwidth of the bandpass filter with a cross-coupled line structure. This structure was designed to have a good filter selectivity with the transmission zeros and a simple design. Since the structure has a cross shape, cross-coupling between the resonators consequently occurs. This interferes with the passband of the filter. Optimization in the size of the coupled lines and transmission lines was done to minimize the interference. Rogers RT/duroid 5880 was used as a substrate to fabricate the bandpass filter to verify the proposed design. As a result, the fabricated cross-coupled line bandpass filter has an 80 MHz of 3 dB bandwidth with operating frequency ranges from 2.97 GHz to 3.05 GHz. The bandwidth is reduced by 20 % from the specification.It shows that the cross-coupled line structure can yield a narrow bandwidth. Based on the 3 dB bandwidth, the center frequency is shifted 0.33 % above the specification. Meanwhile, the return loss and insertion loss of the proposed bandpass filter successfully comply with the required specifications. In conclusion, the proposed bandpass filter can be applied to S-Band applications that require narrow bandwidth.
Development of FMCW Radar Signal Processing for High-Speed Railway Collision Avoidance Farra Anindya Putri; Dayat Kurniawan; Rahmawati Hasanah; Taufiqurrahman Taufiqurrahman; Eko Joni Pristianto; Hana Arisesa; Yusuf Nur Wijayanto; Deni Permana; Winy Desvasari; Ken Paramayudha; Arief Budi Santiko; Dadin Mahmudin; Pamungkas Daud; Fajri Darwis; Erry Dwi Kurniawan; Arie Setiawan; Tajul Miftahushudur; Prasetyo Putranto; Syamsu Ismail
Jurnal Elektronika dan Telekomunikasi Vol 22, No 1 (2022)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jet.482

Abstract

Collision is the main issue in safe transportation, including in the railway system. Sensor systems have been developed to detect obstacles to prevent a collision, such as using cameras. One disadvantage of the camera systems is that performance detection decreases in a not clean environment, like the target position behind the fogs. This paper discusses the development of frequency modulated continuous wave (FMCW) radar signal processing for high-speed railway collision avoidance. The development of radar signal processing combines a two-dimensional constant false alarm rate (2D-CFAR) and robust principal component analysis (RPCA) to detect moving targets under clutter. Cell average (CA) and Greatest of CA (GOCA) CFAR are evaluated under a cluttered wall environment along the railway track. From the experiment, the development of FMCW radar can detect stationary or moving obstacles around 675 meters in front of the locomotive. Combining 2D-CFAR and RPCA algorithm outperforms average background subtraction in extracting moving targets from strong clutter signals along the railway track.
Co-Authors Arie Setiawan Arief Budi Santiko Dadin Mahmudin Dayat Kurniawan Deni Permana Eko Joni Pristianto Enjel Al Birr Rahayu Erry Dwi Kurniawan Farra Anindya Putri Hana Arisesa HANNY MADIAWATI, HANNY Ken Paramayudha Pamungkas Daud Prasetyo Putranto Rahmawati Hasanah Sutrisno Sutrisno Syamsu Ismail Tajul Miftahushudur Taufiqqurrachman Taufiqqurrachman Taufiqurrahman Taufiqurrahman Winy Desvasari Yusuf Nur Wijayanto Yusuf Nur Wijayanto