A novel compact stair-shaped multiband fractal antenna for wireless communication systems

Jaffri, Zain ul Abidin; Ahmad, Zeeshan; Kabir, Asif; Bukhari, S. Sabahat H.

doi:10.2478/jee-2021-0043

Cited by 7 publications

(7 citation statements)

References 51 publications

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“…In addition, the transmitted signals were defined as ideal signals from ideal elements. In real-time, the signal transmission scenario is complex [47][48][49] which results in mutual coupling, frequency increment errors, and non-negligible side lobes, etc. Therefore, the comparison between FDA and phased array will be more complex, and may affect the overall efficiency.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Accurate Theoretical Models for Frequency Diverse Array Based Wireless Power Transmission

et al. 2022

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Wireless power transfer (WPT) is a well-known problem, and has received wide attention in the next generation industrial applications and consumer electronics. On the other hand, frequency diverse array (FDA) is a new concept with the ability to generate a range-angle dependent beampattern. Therefore, some researchers are engaged in designing WPT systems based on the FDA framework (FDA-WPT) instead of phased arrays. Unlike phased arrays, the FDA beampattern is time-variant. Therefore, existing beam collection efficiency models based on the phased array are not suitable for the FDA-WPT system. More importantly, the time-variant property of FDAs is usually ignored in the literature, and the system configuration of the target area where the power-harvesting end is located does not conform to the actual WPT scenario. In this paper, we derive and present accurate models of the FDA-WPT system. The power transfer performance of the corrected FDA-WPT system is then compared with the phased array based WPT system. Simulation results demonstrate that time-variant consideration in the FDA-WPT model causes difficulty in controlling the main beam direction to focus the power. The accurate FDA-WPT is theoretically investigated, and numerical simulations are implemented to validate the theoretical analysis.

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Section: Numerical Simulationsmentioning

confidence: 99%

Accurate Theoretical Models for Frequency Diverse Array Based Wireless Power Transmission

et al. 2022

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“…Therefore, we can conclude that the performance of the proposed FDA radar has been improved evidently by utilizing non-uniform inter-element spacing and random frequency offsets. Moreover, the proposed non-uniform distribution of array element achieves miniaturization of the antenna [27][28][29] which is an attractive feature for various next-generation applications. The length of the 33elements antenna array with proposed non-uniform dis-…”

Section: 3 Transmit Beampattern Synthesismentioning

confidence: 99%

Frequency diverse array radar with non-uniform array spacing based on sigmoid function

Ahmad

Jaffri

Bao

et al. 2022

Journal of Electrical Engineering

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As a widely recognized electronic beam steering concept, frequency diverse array (FDA) radar is an effective and feasible solution to provide beam scanning ability in both angle as well as range dimension as a function of time. However, the conventional FDA radar employing progressive incremental frequency offsets across the array elements generates an S-shaped and range-angle coupled beampattern. As such, the FDA beampattern can be decoupled into range-angle dimensions by employing non-linear frequency offsets or using non-uniform arrays. Frequency offsets design has been extensively researched in recent years, whereas non-uniform arrays were given little attention so far. In this paper, we propose a novel FDA radar with a unified configuration of non-uniform linear array, and non-linear frequency offsets to achieve a high-resolution dot-shaped range-angle dependent beampattern. More specifically, the non-uniform inter-element spacing is calculated using the sigmoid function, and non-linear frequency offsets are generated by logistic map, and triangular window function. Simulation results clearly demonstrate the performance advantages of the proposed FDA radar in terms of beam width and side lobe levels.

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“…Vipul Sharma et al [20] presented a multiband circular fractal antenna with parasitic SRR, which operates at 3, 5, 6.8, 7.5, and 8.5 GHz. Jaffri et al [21] introduced a stair-shaped fractal antenna that resonated at 3.65, 4.825, and 6.325 GHz. Choukiker et al [22] reported a dual wideband modified Sierpinski square fractal antenna.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Tri-Wideband Sierpinski Hexagonal-Shaped Fractal Antenna for Wireless Communication Applications

et al. 2023

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This paper introduces a new tri-wideband fractal antenna for use in wireless communication applications. The fractal manufactured antenna developed has a Sierpinski hexagonal-shaped radiating element and a partial ground plane loaded with three rectangular stubs and three rectangular slits. The investigated antenna has a small footprint of 0.19λ0 × 0.24 λ0 × 0.0128 λ0 and improved bandwidth and gain. According to the measurements, the designed antenna resonates throughout the frequency ranges of 2.19–4.43 GHz, 4.8–7.76 GHz, and 8.04–11.32 GHz. These frequency ranges are compatible with a variety of wireless technologies, including WLAN, WiMAX, ISM, LTE, RFID, Bluetooth, 5G spectrum band, C-band, and X-band. The investigated antenna exhibited good gain with almost omnidirectional radiation patterns. Utilizing CST MWS, the performance of the suggested Sierpinski hexagonal-shaped fractal antenna was achieved. The findings were then compared to the experimental results, which were found to be in strong agreement.

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A novel compact stair-shaped multiband fractal antenna for wireless communication systems

Cited by 7 publications

References 51 publications

Accurate Theoretical Models for Frequency Diverse Array Based Wireless Power Transmission

Accurate Theoretical Models for Frequency Diverse Array Based Wireless Power Transmission

Frequency diverse array radar with non-uniform array spacing based on sigmoid function

A Miniaturized Tri-Wideband Sierpinski Hexagonal-Shaped Fractal Antenna for Wireless Communication Applications

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