最新寬頻帶錐削槽天線及陣列設(shè)計(參考版)
2025-07-03 02:38本頁面
【正文】 而文獻(xiàn)[21]在矩形介質(zhì)諧振器內(nèi)部開槽，形成倒“L”形DRA，%的相對阻抗帶寬。將DRA一部分用空氣替代也是一種降低輻射Q值的方法。因此引入合適的空氣層可使DRA有更寬的阻抗帶寬。文獻(xiàn)[4446]對引入空氣層的研究發(fā)現(xiàn)：當(dāng)DRA的介電常數(shù)很大時，空氣層對DRA的諧振頻率及輻射Q值的影響較大。與微帶天線類似，DRA也是諧振式天線，可通過降低其輻射Q值來達(dá)到增加帶寬的目的。同樣，文獻(xiàn)[38]和文獻(xiàn)[39]分別采用環(huán)形和U形縫隙來實現(xiàn)雙諧振寬帶工作。 寬帶介質(zhì)諧振器天線對于規(guī)則形狀的低介電常數(shù)DRA，其工作帶寬能達(dá)到10%左右，但還達(dá)不到寬帶通信系統(tǒng)的需求。然而，金紅石等高介電常數(shù)材料的溫度穩(wěn)定性很差，導(dǎo)致相當(dāng)大的諧振頻率漂移，盡管介質(zhì)諧振器具有高Q和小尺寸等優(yōu)點，卻仍然無法作為微波器件來使用。 介質(zhì)諧振器天線的研究進(jìn)展 “介質(zhì)諧振器”這一術(shù)語首次出現(xiàn)在1939年，Richtinger[30]第一次理論證明了未金屬化的介質(zhì)球和介質(zhì)圓環(huán)能夠起到微波諧振腔的作用，為微波系統(tǒng)向小型化方向發(fā)展指明了方向。然而，由于微帶貼片天線存在高頻段金屬歐姆損耗高、低頻段天線幾何尺寸較大的兩個關(guān)鍵性技術(shù)瓶頸，一定程度上限制了其發(fā)展和應(yīng)用。關(guān)鍵詞：關(guān)鍵詞1 關(guān)鍵詞2 關(guān)鍵詞3 關(guān)鍵詞4 關(guān)鍵詞5 ABSTRACTIn recent years, dielectric resonator antennas (DRA) and broadband printed slot antennas have been widely studied owing to their good performances. Due to their several advantages such as wide bandwidth, high efficiency and ease of excitation, DRAs have been widely used in millimeter wave regions. Broadband printed slot antennas are widely used in modern wireless munications due to their advantages of low profile, simple fabrication process and ease of integration with circuits. This dissertation is mainly concerned with the design and implementation of various DRAs and broadband printed slot antennas. The author’s major contributions are outlined as follows:1. Two broadband printed slot antennas have been studied. Firstly, according to the requirements of wireless munication systems, a coplanar waveguide (CPW) fed broadband printed slot antenna covering IMT2000, WiMAX and WLAN bands is designed. The resonant frequencies of the antenna are adjusted by changing the structures of the slot and the coplanar waveguide. An impedance transformer is introduced to realize broadband impedance match. Secondly, a microstrip fed printed elliptical wideslot antenna is proposed for ultrawideband applications. The ultrawideband impedance match is achieved by adjusting the axial ratio of the elliptical slot and the elliptical annular patch.2. Two broadband DRAs have been studied. Firstly, a slotfed broadband c
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