Conformal Antenna Array for Millimeter-Wave Communications: Performance Evaluation

TL;DR

This study evaluates how the radius of cylindrical supports affects the radiation properties of conformal millimeter-wave antenna arrays, demonstrating their potential for mobile devices and wearable tech with good simulation-measurement agreement.

Contribution

It provides an experimental and simulation analysis of conformal antenna arrays on cylindrical surfaces at 58.8 GHz, highlighting their large coverage and beam-steering potential.

Findings

Conformal antennas on cylinders achieve broad angular coverage.

Good agreement between simulation and measurement results.

Potential for beam-steering with switchable array configurations.

Abstract

In this paper, we study the influence of the radius of a cylindrical supporting structure on radiation properties of a conformal millimeter-wave antenna array. Bent antenna array structures on cylindrical surfaces may have important applications in future mobile devices. Small radii may be needed if the antenna is printed on the edges of mobile devices and in items which human beings are wearing, such as wrist watches, bracelets and rings. The antenna under study consists of four linear series-fed arrays of four patch elements and is operating at 58.8 GHz with linear polarization. The antenna array is fabricated on polytetrafluoroethylene substrate with thickness of 0.127 mm due to its good plasticity properties and low losses. Results for both planar and conformal antenna arrays show rather good agreement between simulation and measurements. The results show that conformal antenna structures allow achieving large angular coverage and may allow beam-steering implementations if switches are used to select between different arrays around a cylindrical supporting structure.