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Pakhrur Razi
Department of Physics, Universitas Negeri Padang, Padang, Indonesia

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A Microstrip Bandpass Filter Using Parallel Coupled Lines for 2.4 GHz WiFi Application Deli Anggraini; Pakhrur Razi; Yulkifli; Khairi Budayawan
Research on Instrumentation Vol. 2 No. 1 (2025): Research on Instrumentation
Publisher : RESSTECH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66926/rins.2025.25

Abstract

In this ever-evolving digital age, the need for wireless communication technology is becoming increasingly crucial in various sectors, such as commercial, industrial, educational, and even household. One of the most commonly used wireless technologies is WiFi (Wireless Fidelity), which enables high-speed wireless internet connections and supports user mobility efficiently. To ensure optimal WiFi performance, a frequency filter capable of selectively operating at specific frequencies, such as the 2.4 GHz band, is required. This study aims to characterize a bandpass filter for 2.4 GHz WiFi applications. The bandpass filter design employs a parallel coupled lines structure. Simulation results show that the filter has a center frequency of 2.45 GHz with a return loss of −28.6 dB, insertion loss of −1.61 dB, and a bandwidth of 93 MHz, which aligns with the specifications. However, measurement results after fabrication showed differences, namely a center frequency of 2.47 GHz, return loss of −25.65 dB, insertion loss of −3.55 dB, and bandwidth of 93 MHz. In conclusion, although the simulation performance meets the specifications, the fabricated performance shows deviations that are likely caused by fabrication tolerances and imperfections in the fabrication process.
A Microstrip Lowpass Filter Using a Stepped Impedance Hairpin Resonator for GPS Application Resty Amanda; Asrizal; Pakhrur Razi; Khairi Budayawan
Research on Instrumentation Vol. 2 No. 1 (2025): Research on Instrumentation
Publisher : RESSTECH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66926/rins.2025.26

Abstract

The rapidly developing digital era today, particularly advancements in technology within the fields of navigation and information. One such technological advancement is the Global Positioning System (GPS). GPS is a satellite-based system that uses microwave signals to continuously provide accurate information on position, speed, direction, and time, independent of time and weather conditions. As a result, to obtain accurate information, a device known as a lowpass filter is required to reduce interference in the GPS receiver signal. The increasing sophistication of technology has driven the need for more efficient systems. Therefore, filters for GPS receiver applications are generally designed to be small and thin. One such filter with these characteristics is the microstrip filter. This filter has several advantages, including its small size, ease of fabrication, simplicity in production, and ease of integration into other electronic devices. This research aims to analyze the effect of adding stubs, the influence of the filter's physical dimensions, and to characterize the lowpass filter for GPS applications. The filter was designed using a stepped impedance hairpin resonator (SIHR). The substrate used was NPCH-220A with a dielectric constant of 2.17 and a substrate thickness of 1.6 mm. The proposed design complies with the specified filter specifications. Simulation results show a cutoff frequency of 1.79 GHz, return loss of -24 dB, insertion loss in the passband of -0.1 dB, and at the cutoff frequency of -3 dB. Meanwhile, the measurement results show a cutoff frequency of 1.66 GHz, return loss of -45 dB, insertion loss in the passband of -1.6 dB, and at the cutoff frequency of -3 dB. From the results of this study, the microstrip lowpass filter using a stepped impedance hairpin resonator can be used in GPS applications.
Development of Microstrip Low-Pass Filter for Weather Radar Razu Alfurkan Hamdi; Pakhrur Razi; Mairizwan
Research on Instrumentation Vol. 1 No. 2 (2024): Research on Instrumentation
Publisher : RESSTECH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66926/rins.2024.45

Abstract

This study aims to design and fabricate a microstrip-based lowpass filter optimized for weather radar applications at a working frequency of 2 GHz. This lowpass filter is designed using an NPC H220A substrate, which has a dielectric constant of 2.2 and a thickness of 1.6 mm. The selection of this substrate is based on its ability to produce stable performance at high frequencies and has material characteristics that support component miniaturization. The methodology used includes initial design using electromagnetic simulation software to determine the optimal dimensional parameters of the microstrip filter. After that, the fabrication process is carried out based on the simulation results, followed by filter performance testing through S-parameter measurements. The test results show that the designed filter successfully reaches a cutoff frequency of around 2 GHz with low insertion loss, and provides a significant signal reduction at frequencies above the cutoff. This indicates that the filter made has good ability to filter unwanted high-frequency signals, according to the needs of weather radar applications. Overall, this study has succeeded in producing a microstrip lowpass filter that meets the expected technical specifications, so that it can be applied in weather radar systems to improve the accuracy and efficiency of weather signal detection
Co-Authors Asrizal Deli Anggraini Khairi Budayawan Mairizwan Razu Alfurkan Hamdi Resty Amanda Yulkifli