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Room temperature densified ceramics for weight optimized circular polarized GPS antenna design
Author(s) -
Ramachandran Prasadh,
Kähäri Hanna,
Juuti Jari,
Jantunen Heli
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31105
Subject(s) - materials science , ceramic , patch antenna , radiation pattern , fabrication , antenna (radio) , microstrip antenna , composite number , composite material , electrical engineering , engineering , medicine , alternative medicine , pathology
This article presents the use of ceramic composite composed of Li 2 MoO 4 and 9 vol% of BaTiO 3 to realize compact weight optimized circular polarized GPS antenna. The ceramic substrate for the antenna was fabricated with a room‐temperature densification method based on the use of a small amount of an aqueous phase of Li 2 MoO 4 and subsequent recrystallization. A square patch (FT‐FB) was used as a reference patch antenna. This was then compared with a double curved patch antenna (CT‐CB) and a curved patch with a flat bottom (CT‐FB). It was observed that the axial ratio and radiation patterns of the different patch antennas were very similar. In simulations, the FT‐FB patch had peak total efficiency of −2.2 dB, followed by the CT‐CB patch with total efficiency of −2.5 dB and the CT‐FB patch with total efficiency of −2.7 dB. The mass of the FT‐FB and CT‐CB antennas were 12.66 g, while the mass of the CT‐FB antenna was only 9.44 g. Thus, a weight reduction of 25.4% was obtained. Ease of fabrication using Li 2 MoO 4 ‐based composite ceramic helps in creating an optimal antenna design for size and weight‐constrained mobile devices such as drones.