本文關(guān)鍵詞：新型高增益縫隙天線的研究與設(shè)計(jì)　出處：《蘇州大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 表面等離子體激元 引向 縫隙天線 高增益 介質(zhì)周期性的柵格結(jié)構(gòu)

【摘要】：表面等離子體激元(SPPs),是一種存在于金屬和介質(zhì)交界面的電磁波,SPPs可以將電磁場限制在金屬表面,從而產(chǎn)生強(qiáng)烈的場增強(qiáng)效果。近年來,SPPs的研究大多數(shù)集中在光學(xué)波段,然而SPPs的特性不僅適用于光波波段,在微波波段、毫米波波段以及太赫茲波段也能得到應(yīng)用,尤其SPPs的特性在天線方面的應(yīng)用研究更少見。 本文包括兩個(gè)部分,第一個(gè)部分著重研究SPPs的產(chǎn)生、激發(fā)以及新穎效應(yīng)。第二部分主要研究并設(shè)計(jì)兩類高增益天線,一類是采用引向的方式來實(shí)現(xiàn)天線高增益,另一類是利用SPPs透射場增強(qiáng)的特性來實(shí)現(xiàn)天線高增益。 論文首先討論了在微波低頻段,SPPs在金屬表面的存在問題。在微波波段,由于金屬可以看成是完美金屬,此時(shí)只考慮一塊金屬平板,那么它不支持任何極化形式的表面等離子體,但是如果在金屬上刻一些結(jié)構(gòu),那么它就有可能支持表面等離子體激元。由于等離子共振頻率是由自由電子密度決定的,對于微波波段的電磁波,其頻率遠(yuǎn)小于金屬等離子體頻率,這就限制了SPPs在微波波段的應(yīng)用。但是可以通過一些適當(dāng)?shù)拇胧?調(diào)整電子的濃度來改變金屬的等離子頻率,使得等離子頻率為5-6GHz。其次,討論了SPPs的激發(fā)問題。研究發(fā)現(xiàn),電磁波的波矢與SPPs的波矢在水平方向是不匹配的,所以SPPs不能被激發(fā)。為了激發(fā)SPPs,需要使電磁波的波矢和SPPs的波矢在水平方向匹配。結(jié)果表明,實(shí)現(xiàn)波矢匹配的最典型的方法是利用介質(zhì)周期性的柵格結(jié)構(gòu)。 接著,論文對高增益定向天線進(jìn)行了研究,著重研究設(shè)計(jì)了一款帶有一層縫隙引向單元的高增益縫隙引向天線。為了進(jìn)一步提高該天線增益,利用介質(zhì)周期性的柵格結(jié)構(gòu),激發(fā)金屬縫隙引向單元表面的等離子體,使其與入射電磁波發(fā)生耦合,從而提高了電場強(qiáng)度,在不改變尺寸的情況下,使天線的增益提高了1.5dBi。最后,論文還研究了通過調(diào)整介質(zhì)柵格結(jié)構(gòu),實(shí)現(xiàn)天線輻射方向的調(diào)節(jié)。
[Abstract]:The surface plasmon (SPPs), is a present in the metal dielectric interface and the electromagnetic wave, electromagnetic field SPPs can be limited in the metal surface, resulting in a strong field enhancement effect. In recent years, the research of SPPs mostly concentrated in the optical band, however, is not only suitable for the characteristics of SPPs wave band, in microwave band millimeter wave and terahertz band, also can be used, especially the research and application of SPPs characteristics in the aspects of the antenna is rare.
This paper includes two parts. The first part focuses on the production of SPPs, and stimulate new effects. The second part mainly studies the design and two kinds of high gain antenna, one is to adopt the way to achieve high gain antenna, the other is to achieve high gain antenna characteristics using SPPs transmission field enhancement.
This paper first discusses the SPPs in low frequency band of microwave, the problems existing in the surface of the metal. In the microwave band, because the metal can be regarded as the perfect metal, when considering only a piece of metal plate, the surface plasma so it does not support any form of polarization, but if the moment some structure in the metal, so it is possible to support surface the plasmon resonance frequency. The plasma is determined by the free electron density, the microwave electromagnetic wave, its frequency is much smaller than the metal plasma frequency, which limits the use of SPPs in the microwave band. But through some appropriate measures to adjust the electron concentration to change the frequency of the metal plasma, the plasma the frequency of 5-6GHz. is discussed. Secondly, to stimulate SPPs. The study found that the wave vector and wave vector SPPs electromagnetic wave is not matched in the horizontal direction, so SPPs To excite SPPs, we need to match the wave vector of SPPs and the wave vector of the electromagnetic wave in horizontal direction. The result shows that the most typical way to match the wave vector is to use the periodic grid structure of the medium.
Then, the thesis carries out research on high gain directional antenna, focuses on the design of a slot to the unit with a layer of high gain antenna to the gap. In order to further improve the antenna gain, the grid structure medium and periodic plasma excitation to the surface of the metal slit unit, which is coupled with the incident electromagnetic wave. In order to improve the electric field strength, without changing the size of the case, the antenna gain is increased by 1.5dBi. in the end, the paper also studies the medium by adjusting the grid structure, adjust the antenna radiation direction.

【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN823.24

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 王慶艷;王佳;張書練;;基于金屬表面等離子激元控制光束的新進(jìn)展[J];光學(xué)技術(shù);2009年02期

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本文編號(hào)：1413730