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利用衍射光学技术,设计制作的位相型Fresnel波带片,具有厚度薄、重量轻和设计灵活等特点,并且具有较高的衍射效率.目前在光学波段已制作出衍射效率高达97%的波带片.近几年来,人们在考虑把这项技术引入毫米波领域用于天线设计.但到目前为止,仅限于采用位相离散量化为台阶状的Fresnel波带片的型式,一般制作成2个台阶,较好地制作成4个台阶.因此衍射效率很低,导致天线增益不高.如,两个台阶的天线,设计参数为D/f=1.6,f=80mm,v=94GHz.当边缘照射为-10dB时,增益为35dB;4个台阶的天线,设计参数为D/f=1.5,f=400mm,v=11.8GHz.当边缘照射为-10.8dB时,增益不超过35dB.为克服台阶状的Fresnel波带片衍射效率低的弱点,我们设计并制作了具有位相连续变化型式的衍射天线.理论分析和实际测量均表明,这种衍射天线具有较高的增益和良好的电性能,加之具有厚度薄、重量轻的特点,因此具有重要应用价值.
Using diffraction optics technology, the designed phase-type Fresnel zone plate has the characteristics of thin thickness, light weight and flexible design, and has high diffraction efficiency.At present, the optical band has produced a diffraction efficiency up to 97% of the band In recent years, people are considering the introduction of this technology into the field of millimeter-wave for antenna design, but so far it has been limited to the use of Fresnel zone plates discretely quantized into steps, usually made up of two steps , So it is better to make four steps, so the diffraction efficiency is very low, resulting in low antenna gain, for example, the antenna with two steps has the design parameters of D / f = 1.6, f = 80mm and v = 94GHz. Is -10 dB, the gain is 35 dB; the design parameters of the four steps are D / f = 1.5, f = 400 mm and v = 11.8 GHz. When the edge illumination is -10.8 dB, the gain does not exceed 35 dB. Shaped Fresnel zone plate with low diffraction efficiency, we design and fabricate a diffractive antenna with continuously changing phase.The theoretical and practical measurements show that the diffractive antenna has high gain and good electrical performance, Has a thin thickness, light weight characteristics, so have Important application value.