Abstract
An efficient design for a quarter-wave (λ/4) retardation plate (QWP) operating at microwave frequencies has been designed and manufactured using dual head fused deposition modelling (FDM) 3D printing. Exploiting a bespoke composite material feedstock filament with high dielectric permittivity ϵr = 10.8, the resulting 3D-printed QWP comprising alternative layers of high and low permittivity had a high artificial double refraction of Δϵ = 2.9. The QWP provided broadband conversion of linear to circular polarization and phase modulation of an incident plane electromagnetic wave at 12-18 GHz, and demonstrated the potential for optical devices via additive manufacture for use in the microwave frequency range.
Highlights
The manipulation of the phase distribution of electromagnetic waves may allow encoding of transmitted information and control over the propagation and divergence behaviour of the wave
A THz narrow-band linear polarization converter with reduced co– and cross-polarised reflections has been proposed using layered metal grating resonator arrays in a “super-unit-cell” structure placed between polyimide dielectric spacers [11, 12]
All-dielectric, non-resonating polarization converters benefit from wide-band, higher transmission and low absorption loss
Summary
The manipulation of the phase distribution of electromagnetic waves may allow encoding of transmitted information and control over the propagation and divergence behaviour of the wave. Simulate and fabricate an all-dielectric polarisation converter with attractive performance that can be readily realised using a simple 3D printing manufacturing approach, with facile extension to many other optical-like devices operating in the microwave regime.
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