本文關(guān)鍵詞：寬帶波紋圓錐喇叭天線的研究　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 波紋圓錐喇叭 軸向開槽 同軸-波導(dǎo)轉(zhuǎn)換器 相位中心

【摘要】：本文結(jié)合科研項(xiàng)目需求，對(duì)寬帶波紋圓錐喇叭天線進(jìn)行了深入的研究，并已用于工程實(shí)際，具有重要的工程實(shí)用價(jià)值。 基于寬帶波紋喇叭天線的設(shè)計(jì)理論，設(shè)計(jì)了工作于S、C和Ku波段的三種寬帶喇叭天線。在饋電結(jié)構(gòu)上采用脊波導(dǎo)拓寬工作帶寬；通過方圓過渡實(shí)現(xiàn)矩形脊波導(dǎo)與圓錐喇叭之間的模式轉(zhuǎn)換；在喇叭輻射器上，采用軸向開槽的結(jié)構(gòu)實(shí)現(xiàn)良好的圓對(duì)稱性方向圖和穩(wěn)定的相位中心。 工作于S波段圓錐喇叭，通過同軸-脊波導(dǎo)轉(zhuǎn)換器饋電，輻射喇叭采用普通的小張角圓錐結(jié)構(gòu)，其口徑面最大半徑只有51mm，結(jié)構(gòu)簡單緊湊，易于加工。仿真結(jié)果表明，其工作帶寬達(dá)到2:1的倍頻程，在頻帶內(nèi)駐波比低于1.7，增益大于8dB，輻射器方向圖在相同頻點(diǎn)處的E面、H面3dB波瓣寬度差值小于8dB，即圓對(duì)稱性良好，并且有穩(wěn)定的相位中心。 設(shè)計(jì)的C波段波紋圓錐喇叭，通過同軸-脊波導(dǎo)轉(zhuǎn)換器饋電，輻射喇叭采用軸向開槽結(jié)構(gòu)，其口徑面最大半徑為58mm。仿真結(jié)果表明，其相對(duì)帶寬達(dá)到66.7%，在頻帶內(nèi)電壓駐波比低于1.7，增益大于10dB。通過軸向開槽，使得方向圖具有良好的圓對(duì)稱性，副瓣電平低于-17dB，前后抑制比很高，相位中心穩(wěn)定度高。 對(duì)于Ku波段波紋喇叭天線，通過同軸-脊波導(dǎo)轉(zhuǎn)換器饋電，輻射喇叭采用軸向開槽結(jié)構(gòu)，在轉(zhuǎn)換器與喇叭之間加入了波導(dǎo)濾波器，其口徑面最大半徑為20mm。仿真結(jié)果表明，其相對(duì)帶寬達(dá)到40%，在頻帶內(nèi)駐波比低于1.7，增益大于10dB，，副瓣電平低于-18dB，前后抑制比高于20dB，方向圖在相同頻點(diǎn)處的E面、H面3dB波瓣寬度差值小于9.6dB，即圓對(duì)稱性良好，并且相位中心非常穩(wěn)定。 三種天線的測(cè)量結(jié)果與仿真結(jié)果具有良好的一致性，各項(xiàng)性能指標(biāo)均很好地滿足設(shè)計(jì)要求。
[Abstract]:In the light of the requirements of scientific research project , this paper deeply researches the horn antenna of broadband ripple cone , and has been used in engineering practice and has important practical value . Based on the design theory of wide band corrugated horn antenna , three kinds of broadband horn antennas working in S , C and Ku bands are designed . A ridge waveguide is adopted to widen the working bandwidth on the feeding structure , and the mode conversion between the rectangular ridge waveguide and the conical horn is realized by means of the square circle transition , and a good circular symmetry direction map and a stable phase center are realized by adopting an axially slotted structure on the horn radiator . The results show that its operating bandwidth is 2 : 1 , the maximum radius of its aperture plane is only 51mm , its structure is simple and compact , its structure is simple and compact , it is easy to process . The simulation results show that its operating bandwidth is less than 1.7 , the gain is more than 8dB , the difference of the width of H - plane 3 dB lobe is less than 8 dB , that is , the circular symmetry is good , and there is stable phase center . The designed C - band corrugated conical horn is fed through a coaxial - ridge waveguide converter , and the radiating horn adopts an axial slotted structure , the largest radius of the aperture surface is 58 mm . The simulation results show that the relative bandwidth reaches 66.7 % , the voltage standing wave ratio in the frequency band is lower than 1.7 and the gain is greater than 10dB . The directional diagram has good circular symmetry , the side lobe level is lower than -17dB , the front - back suppression ratio is high , and the phase center stability is high . In the case of Ku - band corrugated horn antenna , a coaxial - ridge waveguide converter is used to feed the radiating horn . A waveguide filter is added between the converter and the horn . The maximum radius of the aperture surface is 20 mm . The simulation results show that the relative bandwidth of the antenna is 40 % , the gain is higher than 1 . 7 , the gain is more than -18dB , the difference between the front - to - back suppression ratio is higher than 20 dB , the difference of the width of the H - plane 3 dB lobe is less than 9.6 dB , that is , the circular symmetry is good , and the phase center is very stable . The measurement results of the three antennas have good agreement with the simulation results , and all the performance indexes meet the design requirements well .

【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN823

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本文編號(hào)：1399012