Abstract: Based on the brief introduction of the coaxial contact microwave rotating joint and the test experience of the performance parameters in the actual application process, two test methods of accurate test and rough test are proposed, and the test methods are tested. The situation has been comparatively analyzed and summarized, providing relevant experience and methods for testing such products.
Key words : microwave rotating joint; coaxial contact type; test method
1 IntroductionThe microwave rotary joint is a connecting device for realizing the transmission of radio frequency signals between two relative rotating mechanisms, and is mainly used for continuously rotating the platform to maintain the radio frequency signal continuously transmitted to the fixed platform during the 360° infinite continuous rotation process. For example, in a radar antenna system, a microwave rotating joint is one of the key components to ensure the normal operation of the antenna. When the antenna rotates 360°, the microwave signal can be transmitted from the transmitter to the antenna or from the antenna to the receiver. To realize the search of azimuth and pitch; in the airborne photoelectric pod system, the high-speed image and video signals collected by the high-definition camera, infrared camera, etc. during 360° rotation are also transmitted to the receiver through the microwave rotating joint. Observe and store. Microwave rotating joints can be divided into contact type and non-contact type according to the contact form. The contact type is mainly composed of coaxial rotary joints. It has many advantages such as transmission frequency bandwidth, small size and strong versatility. The disadvantage is the general life. The shorter and less loops are mainly; the non-contact type is mainly a waveguide type rotary joint, and its main advantages are long life and simple structure, and the disadvantages are generally large volume and narrow transmission band. At the same time, the two types of contact joints can be integrated to form an integrated rotary joint to meet the needs of different applications. Based on this, this paper mainly analyzes the methods and experiences of coaxial contact single, double and triple microwave rotary joints in the actual engineering application.
2, coaxial contact microwave rotating jointCoaxial contact microwave rotating joints are widely used for their advantages of transmission frequency bandwidth, small size and strong versatility. Their general application is small in installation space and few demand loops (generally 1-3 channels). The transmission frequency is relatively low (generally below 20 GHz). These rotating joints are generally standard RF coaxial connectors at both ends, such as SMA, N-type, BNC, 2.92mm, 3.5mm, etc., which are very convenient to be directly connected with coaxial cables with the same type of RF connectors. . At present, many foreign companies have produced a variety of such universal rotary joints suitable for different occasions, such as the German company (such as Spinner BN 835047, Spinner BN 153127, etc.), the American diamond company (such as Diamond Antenna). 18-2124-0, 2244A-0, etc.), Cobham, Kevlin and other companies in the United States, and Siverslab (PM7892, etc.) in Sweden. These companies have matured product technologies and processes, and their life span can reach 500. 10,000 turns and above. Figure 1 shows the Spinner BN 835047 single-channel microwave rotating joint of the company, Figure 2 is the 2244A-0 double-channel microwave rotating joint of the diamond company, and Figure 3 is a three-way microwave rotating joint of the company. . There are also a number of research institutes and enterprise graduates in China that produce such products, such as the 23rd Institute of Aerospace Science and Technology, and the 14th of China National Electric Power Co., Ltd., taking the coaxial single-channel microwave rotating joint as an example, compared with foreign countries. There are two shortcomings: one is shorter life and the other is larger.
Figure 1, Spinner BN 835047
Figure 2. Diamond Antenna 2244A-0
Figure 3. Spinner 3-Channel Rotary Joint
3. Analysis of main technical indicatorsTaking the main parameters of the single-channel coaxial microwave rotating joint Spinner BN 835047 as an example (as shown in Table 1), the key indicators affecting the transmission performance of the coaxial microwave rotating joint are analyzed.
Table 1, Spinner BN 835047 main parameter indicators
Frequency range DC-18GHz Rotation speed (Max) 200rpm
Interface form SMA-F-SMA-F (50Ω) ★Life (Min) 5 million revolutions
★Voltage standing wave ratio
(VSWR, Max) 1.3@DC to 10GHz
1.4@10 to 18GHz weight 0.028kg
★Voltage standing wave ratio beating
(VSWR WOW) 0.05 Operating temperature -55 to +85°C
★ Insertion Loss (InserTIon Loss, Max) 0.25dB @DC to 10GHz
0.3dB @10 to 18GHz Starting torque (Max) 0.5 Ncm
★InserTIon Loss WOW 0.05dB peak power 3kW
★Phase Wow 1° Average power 200W@ 1GHz
30W@ 18GHz
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