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All Journal Bulletin of Electrical Engineering and Informatics Advance Sustainable Science, Engineering and Technology (ASSET)
Shairi, Noor Azwan
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Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering

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Journal : Advance Sustainable Science, Engineering and Technology (ASSET)

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Performance Comparison of UWB Single Balanced Schottky Diode Mixers for RF Front-End Applications in 3-10 GHz Band Shairi, Noor Azwan; Mohammed , Yahya Al-gumaei; Zakaria, Zahriladha; Maizatul Alice Meor Said; Misran, Mohamad Harris; Abdullah Mohammed, Zaghir Zobilah
Advance Sustainable Science Engineering and Technology Vol. 7 No. 2 (2025): February-April
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jsy73y58

Abstract

This paper compares two single balanced mixer designs for ultra-wideband  (UWB) of RF front-end at frequencies ranging from 3 to 10 GHz. The proposed mixer designs use two balun topologies for varying mixer performances. Thus, Design 1 incorporates a Coupled Line Balun and Design 2 incorporates a Branch Line Balun. Both designs make use of Skyworks' SMS7621 Schottky diodes, which have a low junction capacitance, and the Rogers RO4350B substrate, which has a dielectric constant of 3.48. The Coupled Line Balun (Design 1) offers a total length of 88 mm, whereas the Branch Line Balun (Design 2) creates a more compact structure with 48 mm. This paper's thorough analysis and measurements show each design's benefits and drawbacks in terms of circuit size and performance. The simulations and measurement results of both designs generally showed a conversion loss of less than 20 dB and LO-RF isolation of better than 50 dB.
Design of Wideband SPDT RF Switch Using Switchable DGS for Sustainable Wireless Systems Othman, Adib; Shairi, Noor Azwan; A Majid, Huda; Saparudin, Faiz Asraf; Zakaria, Zahriladha; Najib Al-Fadhali
Advance Sustainable Science Engineering and Technology Vol. 7 No. 4 (2025): August-October
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i4.1957

Abstract

This paper presents a single-pole double-throw (SPDT) switch that is integrated with a thin rectangular patch switchable defected ground structure (DGS). It is a novel technology for obtaining wideband and high isolation for the SPDT switch in millimeter-wave (mm-wave) telecommunications due to the usage of switchable DGS with bandstop and bandwidth enhancement capabilities. A wideband and high isolation are required for the switchable DGS SPDT switch to operate optimally in mm-wave frequency ranges, as well as to reduce the effect of leakage signal on both the transmitter and receiver connected to the SPDT switch and hence improve system efficiency and signal integrity. The SPDT switch design was combined with two small rectangular patches switchable DGSs that could switch between bandstop and allpass responses using biasing diodes on the DGS. As a result, the suggested SPDT switch with the switchable DGS had 6 dB of insertion loss and high isolation of more than 25 dB with wideband isolation of 25.24% fractional bandwidth, which was consistent with the simulation results. Furthermore, the isolation magnitude is doubled compared to the conventional SPDT switch. This work demonstrates that integrating switchable DGS into discrete SPDT switches provides a practical solution for realizing wideband, high-isolation performance suitable for 5G mm-wave where compactness and bidirectional reconfigurability is increasingly essential for sustainable RF front-end systems.
Co-Authors A Majid, Huda Abdullah Mohammed, Zaghir Zobilah Huda A. Majid, Huda Jamaluddin, Mohd Haizal Maizatul Alice Meor Said Misran, Mohamad Harris Mohammed , Yahya Al-gumaei Mohd Ibrahim, Imran Mohd Yasin, Fatin Nadiah Najib Al-Fadhali Osman, Anwar Faizd Othman, Adib SAPARUDIN, FAIZ ASRAF Zahriladha Zakaria