In the present review paper, we have explained the structure of Y-type hexagonal ferrite and various synthesis techniques. This paper also includes structural, electrical, magnetic properties and applications of Y-type hexaferrites and focusses on their use in antenna applications and microwave absorbing characteristic materials. Ferromagnetic nature of hexaferrites cause the induction of magnetisation within the crystal structure, which divide them into two groups: First with easy axis of magnetisation is known as uniaxial hexaferrites and second is known as ferroxplana having easy plane of magnetisation. The excellent magnetic properties of Y-type ferrites make them useful in the devices operating at high frequency range. The persistence of high refractive index upto 1 GHz enables these hexagonal ferrites useful in UHF antenna designs with small dimensions. The doping in Y-type hexaferrites affect all the properties. Current developments in Y-type hexaferrites will be explained in detail in the review of literature related to Y-type hexaferrites for the last 25 years, i.e. from 1994 to 2019 in this review paper.

Diabetes is one of the most persistent and common immedicable diseases characterized by elevated levels of blood glucose, rendering the early detection and diagnosis of diabetes utmost important. Irrespective of currently available invasive and minimally invasive techniques, the non-invasive glucose measurement has drawn lot of attentionon in present years, and continues to open up new areas for further research. This review provides a comprehensive overview of the developments over the last decade in the area of non-invasive blood glucose monitoring research, with particular reference given to the use of radio frequency electromagnetic wave (EM) for blood glucose sensing. The majority of the glucose sensors described in this paper have been proven to be reliable by Clarke Error Grid analysis or similar methods but, amid all other known challenges such as reproducibility, specificity and sensitivities, these glucose sensors were based on an expensive vector network analyzer (VNA). Finally, we conclude with a positive note that the non-invasive blood glucose monitoring research is beginning to be acknowledged not only on a global scale but also in applied physics and biomedical fields; however, more research is needed to overcome the challenges related to hardware alternative to a VNA and system integration involving enhancement of specificity and sensitivity.