High dielectric constant and low loss microwave dielectric ceramics of (1 &amp;minus; &lt;i&gt;y&lt;/i&gt;)(Mg&lt;sub&gt;0.95&lt;/sub&gt;Co&lt;sub&gt;0.05&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;(Ti&lt;sub&gt;0.95&lt;/sub&gt;Sn&lt;sub&gt;0.05&lt;/sub&gt;)O&lt;sub&gt;4&lt;/sub&gt;&amp;ndash;&lt;i&gt;y&lt;/i&gt;(Ca&lt;sub&gt;0.61&lt;/sub&gt;Nd&lt;sub&gt;0.8/3&lt;/sub&gt;)TiO&lt;sub&gt;3&lt;/sub&gt; for microwave applications

Article:Mahajan, A., Reaney, I.M. orcid.org/0000-0003-3893-6544 and Vilarinho, P.M. (2017) Tuning dielectric properties in ceramics with anisotropic grain structure: The effect of sintering temperature on BaLa4Ti4O15. Materials & Design, ceramics have been studied as a function of sintering temperature with a view to elucidating a general principle by which the microwave properties (MW) can be understood / tuned in systems which exhibit anisotropic grain structures. For BLT sintered at 1500 ºC, reaches a maximum of 51, with tan minimum at 0.002 and = -17 ppm/ºC but subsequently varies non-linearly as sintering temperature increases.Since and are directly proportional in the absence of a phase transition, the variation of as a function of the sintering temperature is also nonlinear. This behaviour is related with variations in the orientation and grain aspect ratio, size and distribution with the sintering temperature and it is demonstrated that by controlling sintering conditions, microwave dielectric properties can be tuned. It is proposed that this is a general phenomenon which can also be used to explain the variation and tune the properties of other ceramic systems with anisotropic grain structures.

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Tuning dielectric properties in ceramics with anisotropic grain structure: The effect of sintering temperature on BaLa4Ti4O15

Mahajan

Reaney

Vilarinho

2017

Materials & Design

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Near‐field sensor based on substrate integrated waveguide microstrip cavity resonator with a circular aperture

Jackson

Wei

et al. 2022

IET Microwaves Antenna & Prop

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A near-field planar sensor fabricated from a substrate integrated waveguide (SIW) cavity resonator is presented. The SIW cavity resonator is a modification of a rectangular microstrip antenna. The rectangular microstrip antenna radiates from two radiating edges that produce far-field radiation, which is undesired for near-field sensing. To suppress the radiation from the edges, the microstrip antenna is modified to have conducting vias that short all four edges of the patch to the ground plane. A circular hole is placed on the patch surface in the middle of the patch to form a sensing aperture. The field is thus confined inside the cavity with leakage only allowed through a small aperture, which is used for sensing surrounding objects in the vicinity of the aperture. This cavity resonator operates in the TM 21 mode of the SIW cavity. Full-wave simulations are performed and the results are consistent with the theoretical analysis as well as CAD formulas that are derived. The performance of the sensor as a near-field sensing device and as a near-field imager is explored.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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High dielectric constant and low loss microwave dielectric ceramics of (1 − <i>y</i>)(Mg<sub>0.95</sub>Co<sub>0.05</sub>)<sub>2</sub>(Ti<sub>0.95</sub>Sn<sub>0.05</sub>)O<sub>4</sub>–<i>y</i>(Ca<sub>0.61</sub>Nd<sub>0.8/3</sub>)TiO<sub>3</sub> for microwave applications

Cited by 2 publications

References 26 publications

Tuning dielectric properties in ceramics with anisotropic grain structure: The effect of sintering temperature on BaLa4Ti4O15

Tuning dielectric properties in ceramics with anisotropic grain structure: The effect of sintering temperature on BaLa4Ti4O15

Near‐field sensor based on substrate integrated waveguide microstrip cavity resonator with a circular aperture

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