Superdirective Linear Dipole Array Optimization

Lonsky, Tomas; Kracek, Jan; Hazdra, Pavel

doi:10.1109/lawp.2020.2981533

Cited by 6 publications

(5 citation statements)

References 22 publications

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“…The literature on superdirective arrays is quite large [1]- [5]. In the general case of P array elements, with the AF theory the field is (5) at equation ( 5) is applied the normalization ( , )…”

Section: A Array Factor (Af) Theorymentioning

confidence: 99%

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A New Method for Gain Prediction of Superdirective End-Fire Arrays

Tornese

Clemente

Delaveaud

2022

2022 16th European Conference on Antennas and Propagation (EuCAP)

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The problem of gain estimation of a superdirective dipole-based end-fire array is discussed in this contribution. The current method to compute the gain, for a given element radiation efficiency, is based on the array factor (AF) theory. This work is intended to show that an equivalent formulation can be done using the Spherical Wave Expansion (SWE). Besides the interest in validating the theory, the main objective is a better understanding of the radiation and attenuation phenomena that occur in compact and superdirective arrays. The limits in their practical implementations are imposed by the high sensitivity of the system. The SWE theory provides more information in the expression of the radiated field, thus unfolding the possibility to address the problem with lower sensitive solutions.

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Section: A Array Factor (Af) Theorymentioning

confidence: 99%

“…The maximization of directivity in end-fire arrays has been demonstrated in previous studies using array factor (AF) theory [1]- [5] and more recently Spherical Wave Expansion (SWE) [6]. It is possible to show through numerical and fullwave simulations that the two methods are equivalent.…”

Section: Introductionmentioning

confidence: 95%

A New Method for Gain Prediction of Superdirective End-Fire Arrays

Tornese

Clemente

Delaveaud

2022

2022 16th European Conference on Antennas and Propagation (EuCAP)

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“…In a perfectly matched array, the overall efficiency, encompassing both line and radiation efficiencies, tends to be exceptionally high. Many studies commonly rely on this assumption while neglecting the concept of realized gain [10]- [13]. However, in superdirective arrays, the realized gain diminishes considerably due to impedance mismatches within the array's transmission lines [2], [8].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Super-Directive Linear Arrays with Differential Evolution for High Realized Gain

Kanbaz,

Yurduseven,

Matthaiou

2024

2024 18th European Conference on Antennas and Propagation (EuCAP)

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Due to the low impedance and high feeding currents, it is naturally challenging to design super-directive antenna arrays that perfectly match the feed line, and this becomes almost impossible as the number of elements increases. In this paper, we assert that it is crucial to consider the tradeoff between directivity and overall efficiency (to achieve high realized gain) before employing super-directive arrays in realworld applications. Given this trade-off (high directivity and low mismatch for high realized gain), a 4-element dipole array (unit array) is optimized using the differential evolution (DE) algorithm. Then, the performance of the unit array in subarray configuration scenarios is analyzed. Finally, the obtained parameters are verified using the CST full-wave simulation software. The results clearly indicate that the proposed unit array is a strong candidate for dense array applications, particularly in the context of massive multiple-input multiple-output (MIMO), thanks to its notable high gain and efficiency.

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“…The theme of superdirectivity has been studied from both information theoretic and pure electromagnetic standpoints, e.g., [12]- [17], and references therein. However, most of the related literature considers arrays of uniform spacing.…”

Section: Introductionmentioning

confidence: 99%

Superdirective Antenna Pairs for Energy-Efficient Terahertz Massive MIMO

Dovelos¹,

Assimonis²,

Ngo³

et al. 2022

Preprint

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Terahertz (THz) communication is widely deemed the next frontier of wireless networks owing to the abundant spectrum resources in the THz band. Whilst THz signals suffer from severe propagation losses, a massive antenna array can be deployed at the base station (BS) to mitigate those losses through beamforming. Nevertheless, a large number of antennas increases the hardware complexity and circuit power consumption, and hence it can lead to poor energy efficiency (EE). To surmount this fundamental problem, we propose a novel array design based on coupled antenna pairs. Specifically, we exploit the mutual coupling between closely spaced antennas to form superdirective pairs. A unique property of them is that all require the same excitation amplitude, and therefore can be driven by a single radio frequency chain akin to conventional phased arrays. Moreover, they facilitate the implementation of multi-port impedance matching, which ensures maximum power transfer for any beamforming angle. After addressing the hardware-related problems of superdirectivity, we show that the number of BS antennas can be effectively reduced without sacrificing the achievable rate. Simulation results showcase that our design offers huge EE gains compared to uncoupled uniform linear arrays, and hence could be a radical solution for future THz systems.

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Superdirective Linear Dipole Array Optimization

Cited by 6 publications

References 22 publications

A New Method for Gain Prediction of Superdirective End-Fire Arrays

A New Method for Gain Prediction of Superdirective End-Fire Arrays

Optimization of Super-Directive Linear Arrays with Differential Evolution for High Realized Gain

Superdirective Antenna Pairs for Energy-Efficient Terahertz Massive MIMO

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