Transformation-Optics-Based Design of a Metamaterial Radome for Extending the Scanning Angle of a Phased-Array Antenna

Abstract

We apply the transformation-optics approach to the design of a metamaterial radome that can extend the scanning angle of a phased-array antenna. For moderate enhancement of the scanning angle, via suitable parameterization and optimization of the coordinate transformation, we obtain a design that admits a technologically viable, robust and potentially broadband implementation in terms of thin-metallic-plate inclusions. Our results, validated via finite-element-based numerical simulations, indicate an alternative route to the design of metamaterial radomes which does not require negative-valued and/or extreme constitutive parameters.

Theory and Simulation of Metasurface Lenses for Extending the Angular Scan Range of Phased Arrays

“…Note that this is in an approximate agreement with theory. According to (4), an angle-tripler is expected to exhibit a 4.8dB directivity degradation. The other curves of Fig.…”

“…A physical dielectric dome was fabricated and tested in [2]. Further theoretical and implementation advancements include design of refracting domes with transformation optics techniques [3], [4], and reformulating the beam refraction problem as transferring gain pattern envelopes using power conservation [5], [6]. All these phase incurring strucutres which achieved phased array scan enhancement did so at a cost of a degraded directivity, especially in the broadside direction.…”

Inverse Design of Artificial Materials Based Lens Antennas through the Scattering Matrix Method

“…In fact, TO aims at tailoring the spatial constitutive profile of a material to properly control the electromagnetic wave propagation. This rigorous formulation has been proved to be effective for a number of applications [14][15][16][17][18][19], with the relevant drawback being the bi-anisotropy of the arising material.…”

Design of a hybrid A-sandwich radome using a strongly coupled frequency selective surface element

“…In recent years, rapid growth in the fields of EM design and analysis techniques based on advanced numerical computations and hybrid algorithms [4,5]. Many EM design techniques have been reported to cater the desired performance of radome structures [6][7][8][9]. Frequency selective surfaces (FSSs) are the planar, periodic structure, and may be printed on a substrate or a conducting screen perforated with slots to exhibit filter characteristics for EM waves impinge on it [10].…”