ceramics
3D printingTechnology in
aviation
aerospace
, Artificial bone, industrial precision parts production, handicrafts and other fields have many applications. However, there are few reports on applications in the field of radio frequency devices and microwaves.
It is reported that the team of Professor Lu Wenzhong from the School of Optics and Electronic Information of Huazhong University of Science and Technology and the Key Laboratory of Electronic Information Functional Materials of the Ministry of Education used the CeraBuilder100 ceramic laser of Intale Laser3D printingThe machine-printed near-zero thermal expansion Ba1-xSrxZn2Si2O7-based microwave dielectric ceramic resonator antenna and integrated lens have potential application prospects in satellite communications with stable temperature. This microwave dielectric material is also very good in high-frequency communications and 5G fields. Application prospects. The result was published in the famous foreign journal ADVANCED MATERIALS under the name “Near-Zero Thermal Expansion Ba1-xSrxZn2Si2O7-Based Microwave Dielectric Ceramics for 3D Printed Dielectric Resonator Antenna with Integrative Lens”
In extreme environments such as aerospace, there is an urgent need for lens antennas with high gain, low weight, wide bandwidth, and miniaturized temperature resistance. However, high-performance microwave dielectric ceramics with near-zero thermal expansion and frequency shift with temperature are very rare. Ba1-xSrxZn2Si2O7 has a negative coefficient of thermal expansion (CTE), CTE comes from[ZnO4]The tetrahedral chain stretches to twist along the b-axis with temperature. In 0.95(0.9Zn1.8SiO3.8-0.1Ba0.4Sr0.6Zn2Si2O7) -0.05CaTiO3 ceramics, CTE and τf with positive resonance frequency temperature coefficient can effectively Adjusting the CTE and τf of Zn1.8SiO3.8 is close to zero, which is a very ideal near-zero thermal expansion radio frequency dielectric material.
The author team designed an antenna structure using the Ba1-xSrxZn2Si2O7-based microwave dielectric ceramic material with near zero thermal expansion, as shown in the figure below.
Utilize CeraBuilder100 ceramics3D printingThe designed lens antenna structure was printed and molded.
The author measured the parameters of the printed product, and obtained relatively ideal results. The measurement showed that the average gains of the printed Kuband Luneburg lens integrated antenna at 10.45-11.39 GHz and 12.27-13.45 GHz were 8.06dBi and 10.3dBi, respectively.
The dual adjustment of CTE and τf in a1-xSrxZn2Si2O7 microwave dielectric ceramics has potential application value in the field of microwave devices. In addition, Ba1-xSrxZn2Si2O7 ceramics have rare NCTE characteristics and are effective CTE regulators and sintering aids for Zn1.8SiO3.8 ceramics.Therefore, 0.95(0.9Zn1.8SiO3.8-0.1Ba0.4Sr0.6Zn2Si2O7)-0.05catio3 ceramics exhibit excellent microwave dielectric properties and ZCTE properties, making it a photocurable3D printingIt is an ideal candidate DRA material for the production of integrated lenses. The designed lens antenna gain has been enhanced, widening the working bandwidth (the average gain is 8.06 dBi at 10.45-11.39 GHz), and the average gain is 10.3 dBi at 12.27-13.45 GHz. Therefore, the new lens antenna designed by the author’s team has potential applications in temperature-stable satellite communications.
Since 2000, Professor Lu Wenzhong’s team has applied CeraBuilder 100 ceramics3D printingIn the field of ceramic microwave and radio frequency devices, four important papers have been published in well-known foreign journals. The content covers microwave dielectric ceramic printing paste, lens antenna preparation, and microwave ceramic filter.3D printingWait.
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