A Secondary Mirror Design Method for Improving the Gain of Dual-mirror Antenna
A dual-mirror antenna and design method technology, applied to antennas, electrical components, etc., can solve the problem of antenna performance degradation, no consideration of the antenna's working frequency band, low frequency, and the electrical size of the secondary mirror is only a dozen or even less than ten working wavelengths and other issues to achieve the effect of improving orientation and uniformity
Active Publication Date: 2017-10-03
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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However, this method does not consider the specific working frequency band of the antenna. Therefore, when the minimum working frequency of the antenna is low, and the electrical size of the secondary mirror is only a dozen or even less than ten working wavelengths, the performance of the antenna will drop significantly.
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[0025] A kind of auxiliary mirror design method that improves dual-mirror antenna gain, is characterized in that comprising the steps:
[0026] (1) Select the geometric parameters of the dual-mirror antenna, refer to figure 1 , the geometric parameters of the dual-mirror antenna include the illumination angle θ, the primary mirror diameter D, the primary mirror focal-diameter ratio f / D and the secondary mirror size Ds;
[0027] (2) According to the lowest working frequency of the antenna, determine the width d of the annular region where the secondary mirror does not correspond to the primary mirror, namely:
[0028] d=k*λ 0
[0029] lambda 0 is the working wavelength corresponding to the lowest working frequency of the dual-mirror antenna, k is a real number, and the value range is 0.01 to 3;
[0030] refer to figure 2 and image 3 , a secondary mirror design method for improving the gain of the dual-mirror antenna in the present invention reduces the size of the area ...
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The invention relates to a method for designing a secondary mirror for improving the gain of a dual-mirror antenna, and is characterized in that: the secondary mirror of a dual-mirror antenna designed by the method is compared with a conventionally designed secondary mirror except for the part that has an optical path corresponding relationship with the primary mirror , the auxiliary mirror extends a certain size along the bus to form a ring-shaped area that does not have an optical path corresponding relationship with the main mirror. The general design is correspondingly reduced, so that the total size of the secondary mirror is basically the same as that of the conventional design, so as to achieve the purpose of improving the interception efficiency of the secondary mirror, optimizing the aperture field distribution of the primary mirror, and increasing the antenna gain. It is suitable for Cassegrain antennas, Gurley Various dual-mirror antennas such as Gauri antennas and ring-focus antennas.
Description
technical field [0001] The invention discloses a secondary mirror design method for improving the gain of a dual-mirror antenna, which can achieve the purpose of improving the interception efficiency of the secondary mirror, optimizing the aperture field distribution of the primary mirror, and improving the antenna gain, and is suitable for Cassegrain antennas, Gregorian Various dual-mirror antennas such as antennas and ring-focus antennas, especially suitable for various types of dual-mirror antennas with small and medium-sized secondary mirrors. Background technique [0002] Dual-mirror antenna is a typical form of high-gain antenna, which has a wide range of applications in satellite communication, radio astronomy, radar, radio monitoring and many other fields. [0003] At present, the design of the dual-mirror antenna is mainly based on ray tracing. The main mirror and the secondary mirror are generally designed so that the optical paths are completely corresponding, tha...
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IPC IPC(8): H01Q15/16
Inventor 伍洋刘胜文杜彪
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP