arXiv subjects

Muhammad Asfar Saeed

Publications and source records attributed to Muhammad Asfar Saeed.

4 recordsLinked to original sources

arXiv2026

A Wideband Narrow Beam 1x6 Linear Antenna Array for Automotive Radar and 5G Millimetre-Wave Applications

This paper presents the design and performance analysis of a 1x6 linear microstrip patch antenna array tailored for automotive radar and 5G millimetre-wave (mm-wave) applications. The proposed antenna array comprises six rectangular radiating patches with the primary patch excited using a microstrip feedline, while the remaining patches are interconnected through narrow microstrip lines with a width of 0.1 mm, enabling effective power distribution along the array. Optimal inter-element spacing facilitates constructive and destructive interference, enabling the formation of a narrow beam with enhanced directivity and a wide operational bandwidth. The high-gain radiation characteristics are achieved through the combined effects of the six-element linear configuration and precise impedance matching. Key performance metrics including reflection coefficient, current distribution, and radiation patterns have been analysed. Results demonstrate a reflection coefficient better than 10 dB across the target frequency range and a narrow beamwidth with high directivity, making the array suitable for high-resolution automotive radar and 5G mm-wave communications. Potential applications include vehicle-to-vehicle (V2V) radar sensing, lane change detection, blind spot monitoring at 28 GHz, and high-capacity point-to-point wireless backhaul links. The design offers a promising solution for compact, high-performance beamforming antenna systems in intelligent transportation and next-generation wireless networks.

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arXiv2025

Asymmetric 4.77 Three-Way Unequal Filtering Power Divider/Combiner for Communication Systems Application

This study presents a novel three-way unequal filtering power divider/combiner, addressing challenges in unequal power distribution while incorporating filtering functions in communication systems. Wilkinson power divider (WPD) is the traditional power division approach using quarter-wavelength transmission lines [1]. This type of power divider is popularly used in communication systems due to its good electrical isolation and simple structure. The problem with WPD is that its operation requires the use of an externally connected bandpass filter (BPF) to achieve filtering functionality. This leads to increased footprint and increased loss coefficients in a system. In contrast to the traditional design approach involving a BPF, a matching transmission line, and a Wilkinson power divider as separate components, the proposed integrated filtering power divider (FPD) consolidates all three components into a single device, leading to lower footprint and lower loss coefficient in a system. Circuit modelling and electromagnetic (EM) simulations were conducted to ensure alignment between theoretical and practical results. The design demonstrates effective unequal power division at the three output ports while maintaining very good filtering performance. Results show a return loss better than 15 dB and a minimum insertion loss of 1.2 dB. The overall size of the device is 32.2 x 50.0 mm. This paper contributes to advancements in power divider design by addressing unequal power division challenges and integrating filtering functions. The findings offer a foundation for future developments in advanced power divider/combiner systems, with insights into potential challenges and areas for further improvements.

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arXiv2025

Design of a compact low loss 2-way millimetre wave power divider for future communication

In this paper, a rectangular-shaped power divider has been presented operating at 27.9 GHz. The power divider has achieved acceptable results for important parameters such as S11, S12, S21, and S22. The substrate employed for the power divider is Roger 3003 which has a thickness of 1.6 mm. This power divider provides a reflection coefficient of -12.2 dB and an insertion loss of 3.1 dB at 28 GHz. This ka-band T-junction power divider covers 68% of the bandwidth. Dimensions of the ka-band T-junction power divider are 50x80 mm. Due to its dimensions and bandwidth this power divider is more suitable for millimetre wave applications like RADAR, beamforming, and 5G applications.

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arXiv2024

Design of a Rectangular Linear Microstrip Patch Antenna Array for 5G Communication

This paper presents the design and characterization of a rectangular microstrip patch antenna array optimized for operation within the Ku-band frequency range. The antenna array is impedance-matched to 50 Ohms and utilizes a microstrip line feeding mechanism for excitation. The design maintains compact dimensions, with the overall antenna occupying an area of 29.5x7 mm. The antenna structure is modelled on an R03003 substrate material, featuring a dielectric constant of 3, a low-loss tangent of 0.0009, and a thickness of 1.574 mm. The substrate is backed by a conducting ground plane, and the array consists of six radiating patch elements positioned on top. Evaluation of the designed antenna array reveals a resonant frequency of 18GHz, with a -10 dB impedance bandwidth extending over 700MHz. The antenna demonstrates a high gain of 7.51dBi, making it well-suited for applications in 5G and future communication systems. Its compact form factor, cost-effectiveness, and broad impedance and radiation coverage further underscore its potential in these domains.

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