A kind of microstrip antenna organic composite substrate material and its preparation method

Abstract

The invention provides an organic composite substrate material for a microstrip antenna and a preparation method thereof, belonging to the technical field of electronic materials. The organic composite substrate material is composed of the main phase material and the auxiliary phase material at a mass percentage ratio of 100:(80-120), the main phase material is Co2Z type hexagonal ferrite, and the molecular formula of the formula is (Ba1-xSrx )3Co2Fe24O41, wherein x ranges from 0 to 0.5, and the auxiliary phase material is polytetrafluoroethylene resin. The preparation method comprises 1) weighing, mixing, drying after primary ball milling; 2) pre-calcination; 3) secondary ball milling and drying; 4) compounding and drying; 5) hot pressing molding. The method is easy to operate and low in cost; the obtained composite substrate material has high magnetic permeability and dielectric constant in the frequency range of 100 MHz to 1 GHz, and its magnetic loss and dielectric loss are also low; the obtained substrate is flexible Good quality and uniformity.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and relates to an inorganic / organic composite magnetic substrate material suitable for 100MHz-1GHz microstrip antenna application and a preparation method thereof. Background technique [0002] Microstrip antenna is a new type of antenna that appeared in the early 1970s. It has the advantages of small size, light weight, low profile, easy to conform to the carrier, good compatibility with integrated circuits, and easy to achieve dual-band and dual-polarization work advantages. Conventional microstrip antennas have relatively high application frequencies. In recent years, with the development of mobile communication technology, microstrip antennas in lower frequency bands (such as UHF, L, and S bands) have gradually been applied and developed. However, according to the structural design calculation formula of the microstrip antenna, the size of the substrate is proportional to the wa...

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Problems solved by technology

However, these previously reported magnetic dielectric materials have a prominent problem, that is, their magnetic permeability and permittivity are relatively high. Although they can reduce the size of the antenna to a large extent, according to the Snooker's law that magnetic materials follow , the higher the magnetic permeability, the lower the cut-off frequency. Therefore, the applicable frequency of the previously reported magnetic dielectric materials is below 300MHz, and some are even only suitable for applications in the frequency band below 100MHz, and cannot be used on antenna substrates above 300MHz.

And the substrate material is made of pure ceramics with poor flexibility

For this reason, the Chinese invention patent "a microstrip antenna composite substrate material and its preparation method (ZL201110235563.5)" applied by Tang Xiaoli and Su Hua of the University of Electronic Science and Technology of China in 2011 has improved this. Oxygen is compounded with polypropylene resin to obtain a magnetic dielectric substrate material applied above 300MHz, but this method is complicated to operate and increases the cost of industrial application

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