【摘要】：針對(duì)W波段波導(dǎo)縫隙天線加工難度高、加工后縫隙尺寸不易修改的問題,提出了一種改進(jìn)型縫隙電導(dǎo)函數(shù)提取方法.首先,根據(jù)工藝可實(shí)現(xiàn)性,設(shè)定合理的波導(dǎo)輻射面壁厚和縫隙寬度;然后,應(yīng)用HFSS軟件計(jì)算出不同縫隙切入深度和縫隙傾斜角度的縫隙電導(dǎo)值;最后,利用Matlab軟件擬合出電導(dǎo)函數(shù)曲線,并進(jìn)行階梯狀的分段近似,以簡(jiǎn)化加工工藝復(fù)雜度.基于優(yōu)化設(shè)計(jì)結(jié)果,加工出4套天線樣品,采用緊縮場(chǎng)測(cè)試方法對(duì)天線進(jìn)行輻射方向圖測(cè)量.結(jié)果表明,在75~79 GHz的頻帶內(nèi),天線增益均大于23.5 d Bi,E面3 d B波束寬度為1.2°,旁瓣電平低于-20 d B.當(dāng)頻率從75 GHz掃描至79 GHz時(shí),E面3 d B波束覆蓋范圍為5.5°.4套天線的性能測(cè)試結(jié)果展現(xiàn)出較好的一致性,從而驗(yàn)證了設(shè)計(jì)方法的正確性和有效性.
[Abstract]:In order to solve the difficulty of machining W-band waveguide slot antenna and the difficulty of modifying slot size after machining, an improved slot conductance function extraction method is proposed. Firstly, according to the realization of the process, the wall thickness and slot width of the waveguide radiation surface are set reasonably, and then, the gap conductivity values of different slit depth and slot tilt angle are calculated by HFSS software. Finally, the curve of conductivity function is fitted by Matlab software, and the step-like piecewise approximation is carried out to simplify the complexity of machining process. Based on the optimized design results, four sets of antenna samples were fabricated, and the radiation pattern of the antenna was measured by the method of compact field measurement. The results show that the gain of the antenna is greater than 23.5 d Bi, E plane 3 dB beamwidth and the sidelobe level is lower than-20 dB in the frequency band of 75 / 79 GHz. When the frequency range is from 75 GHz to 79 GHz, the 3 dB beam coverage of the E plane is 5.5 擄. The performance test results of 4 sets of antennas show good consistency, thus validating the correctness and effectiveness of the design method.
【作者單位】： 東南大學(xué)毫米波國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【分類號(hào)】：TN823.24

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