Abstract
<p class="Abstract">3D-printer materials are becoming increasingly appealing, especially for high frequency applications. As such, the electromagnetic characterisation of these materials is an important step in evaluating their applicability for new technological devices. We present a measurement method for complex permittivity evaluation based on a dielectric loaded resonator (DR). Comparing the quality factor <em>Q</em> of the DR with a disk-shaped sample placed on a DR base, with <em>Q</em> obtained when the sample is substituted with an air gap, allows a reliable determination of the loss tangent.</p>
Highlights
In recent years, the fast development and improvement of 3D-printing technologies has had a significant impact on many areas of human activity [1]-[5]
- The Vector Network Analyzer (VNA) is calibrated using the Short Open Load Through (SOLT) method, and the 12-errors parameters are applied to the frequency range in which the measurements are performed;
The measurements were performed on four dielectric samples, which were of different thickness values t as reported in Table 1, made of a photopolymer material printed using the PolyJetTM deposition technique
Summary
The fast development and improvement of 3D-printing technologies has had a significant impact on many areas of human activity [1]-[5]. The microwave characterisation of plastic 3Dprinting materials is performed using a resonant perturbative technique. A microwave (∼ 12.9 GHz) measurement method based on a resonant technique is proposed. Dielectric printed materials are already used for high frequency applications, and some works have explored their dielectric permittivity. The measurements were performed at 15 GHz with a split post dielectric resonator obtaining u(tan δ)/ tan δ ∼ 0.4 %. The resonator presented in this work is tuned to a similar frequency (∼ 12.9 GHz) and has a somewhat reduced sensitivity compared with the split post resonator but a much improved ease of operation – a useful feature in view of the routine measurements required.
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