New product development of organic magnetic materials and their application in high-frequency microwave electronic devices Lin Yun \ Lin Zhanru 2, Gan Jiuzhi 2 (1. Shenzhen Kangyuan Organic Magnetic Company, Shenzhen 518038, Guangdong, China; 2. Department of Chemistry, Sichuan Normal University, Chengdu, Sichuan 610066) Anti-irradiation and anti-aging properties, can be used to make high-performance high-frequency, microwave electronic devices, such as directional coupler (a brancher), two-way 90 * power distribution / synthesizer and band-pass filter, etc., and Compared with similar ferrite devices, the overall performance is better in a certain frequency band.
1 Introduction Modern electronic devices are developing towards light weight, miniaturization and planarization, that is, light, small and thin. Although ferrite has been widely used in electronic devices, its specific gravity, fragility, and difficulty in processing make it difficult to adapt to some special requirements of aerospace and military industries. In order to seek a new generation of light-weight, easy-to-process and good impact-resistant magnetic materials, in recent years, we have developed a synthetic route different from the United States, Japan, Russia and other countries using domestic raw materials and unique synthesis methods in combination with national conditions. Developed a series of organic magnetic materials stable at room temperature. These materials are modified by physical treatment and chemical blending to become a new type of lightweight organic magnetic materials with good impact resistance, radiation resistance and aging resistance. With the assistance of many electronic experts in Chengdu, a series of properties have been produced Excellent high-frequency, microwave devices. It is expected that it will be widely used in military, aerospace and civil high-tech fields.
2 Preparation and performance testing of materials and devices 2.1 Preparation of materials and devices First of all, according to our patent, in a high-purity nitrogen or argon gas, ferrocene is used as a raw material to synthesize an organic magnetic material precursor (non-magnetic) through a multi-step reaction, and then The self-made transition metal magnetizer reacts to form a black organic magnetic material powder that is stable at room temperature. Finally, it is blended and modified with additives in the presence of a coupling agent, and then hot-pressed into an organic magnetic rod, magnetic ring or magnetic plate for making electronic devices.
2.2 Performance testing The intrinsic magnetic parameters are opened by the National Institute of Physics of the Chinese Academy of Sciences to 10%, while, and are basically unchanged.
The measurement of the four-year natural aging sample using the 0 table shows that the organic magnetic material increases the value of 10% after four years of natural aging in air, as shown in Table 2. Using the HP4272A instrument to measure the 0 / law of 10kHz10MHz is basically the same.
Comparing the comprehensive performance of impact-resistant and radiation-resistant organic magnetic materials with NiZn ferrite, it can be seen that in the low frequency band below 100MHz, organic magnetic materials are not as good as NiZn ferrite; but in the wide frequency range of 1003500MHz, it is NiZn ferrite has many advantages, as shown in Table 3.
4 Development of high-frequency microwave electronic devices 4.1 Directional coupler Transformer type directional coupler (a brancher) is a coil of a certain number of turns wound on a magnetic core and forms a certain form of circuit with resistance and capacitance for directional power Sampling, signal source and dynamic monitoring, signal branching, power amplifier feedback, and letter 1 The organic magnetic powder is irradiated at 6 ° Cy and is irradiated with the change of frequency (total irradiation dose of 15000MGy) Before irradiation After irradiation Before irradiation After irradiation Before irradiation After irradiation Before irradiation After irradiation Magnetic materials and devices October 2002 Table 2 Naturally aged g values ​​of organic magnetic samples containing Zn, Pb, Co Pb sample containing Co sample Table 3 Comparison of comprehensive performance of organic magnetic materials and NiZn ferrite Magnetic properties Organic magnetic materials Applicable temperature range / ° c Temperature change rate /% Applicable frequency f / MHz Note: NiZn ferrite in the manual of magnetic materials The magnetic permeability and tg5 of the body only list the data below 300MHz, and the data above 300MHz of the ferrite in the table are estimated (for supply).
Table 4 Comparison of organic magnetic and ferrite directional couplers Model and manufacturer frequency range / MHz insertion loss / dB branching loss / dB reverse isolation / dB reflection loss / dB (a Beijing research institute) (a Chengdu factory) 25 30 (A factory in Chengdu) 23 Organic magnets * (Sichuan Normal University) * Measured data, other manufacturers' data are taken from the product catalog, Table 5 and Table 6 are the same.
The relationship between the insertion loss (A) and branching loss (B) and frequency of organic magnetic directional coupler and the relationship between the insertion loss (A) and reverse isolation and frequency of organic magnetic directional coupler Magnetic (No. 2 magnetic powder) frequency range / MHz isolation / dB insertion loss / dB amplitude imbalance / dB phase imbalance / Table 6 Organic magnetic and ferrite power distribution / combiner (two-way 90 °) performance Comparison (2) Other processing such as frequency range / MHz isolation / dB insertion loss / dB amplitude imbalance / dB phase imbalance / number of organic magnets (No. 2 magnetic powder) of Sichuan Normal University, a certain factory in Chengdu. The directional coupler designed and debugged with the double-hole magnetic core made of 07X2mm organic magnetic material has the advantages of better frequency bandwidth and better performance than similar ferrite products produced by domestic famous manufacturers, as shown in Table 4. The relationship between the performance of the organic magnetic directional coupler and the frequency is shown in and below.
4.2 Organic magnetic power distribution / synthesizer (two-way 90 *) power distribution / synthesis is widely used in electronic systems and test equipment, can accurately complete the power distribution and synthesis, power monitoring, signal source isolation and transmission test, etc. With many functions, the power distribution / synthesizer with high-impact resistant organic magnetic core designed by special circuit has obvious superior performance compared with similar products at home and abroad. As shown in Tables 5 and 6. The relationship between organic power distribution / synthesizer performance and frequency is shown below.
5 Conclusion The organic magnetic material black powder has good temperature resistance, vibration resistance and impact resistance through blending modification.
Long-term high-dose 60Co-Y ray continuous irradiation and natural aging tests show that organic magnetic materials have good radiation resistance and natural aging resistance.
Magnetic materials and devices In October 2002, the directional coupler, power distribution / synthesizer (two-way 90 *) and band-pass filter made of organic magnetic materials have better comprehensive performance than similar ferrite products at certain frequencies. Good development value and development prospects.
Acknowledgements: Heartfelt thanks to Wang Pei, Yu Songlin, Chengdu 970 Factory, Zhong Chengde Senior Engineer of 57 General Staff, Engineer Lu Xiangming, and Li Chunlin Senior Engineer of the Tenth Institute of Electronics of the Ministry of Information Industry for assisting in the manufacture of electronic devices in this article using organic magnetic materials, and Test their performance, with their great assistance, we may develop organic magnetic materials to commercialization.
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