Abstract: A novel MEMS dual-band patch antenna is designed using slot-loaded and short-circuited size-reduction techniques. By controlling the short-plane width , f10 and f 30 , two resonant frequencies, can be significantly reduced and the frequency radio ( f30/ f10) is tunable in the range 1.7～2.3.The Haar-Wavelet-Based multiresolution time domain (H-MRTD) is used for modeling and analyzing the antenna for the first time. In addition , the mathematical formulae are extended to an inhomogenous media. Numerical simulation results are compared to those achieved using the conventional 3-D finite-difference time-domain (FDTD) method and measured. It has been demonstrated that , with this technique , space discretization with only a few cells per wavelength gives accurate results , leading to a reduction of both memory requirements and computation time.
Key words : dual-frequency antenna; H-MRTD method ; FDTD method ; MEMS; UPML absorbing boundary conditions
摘要：利用槽隙加截及短接技術(shù)設(shè)計了雙頻小型微帶天線。通過調(diào)節(jié)短接面寬度，兩諧振頻率f10及f30可明顯降低，天線尺寸顯著減小，而且頻比（f30/f10）的可調(diào)范圍為1.7～2.3。首次將三維H-MRTD（Haar-Wavelet-Based Multiresolution Time Domain）全波分析方法應(yīng)用于該天線的建模和分析，并將H-MRTD數(shù)值計算公式推廣到了非均勻有耗媒質(zhì)中。數(shù)值模擬結(jié)果同傳統(tǒng)FDTD（Finite Difference Time Domain）方法及實(shí)驗(yàn)結(jié)果進(jìn)行了比較。結(jié)果表明，每個波長只需取較少的空間離散網(wǎng)格，三維H-MRTD時域全波分析方法便能較精確地模擬微機(jī)械微帶天線，并能有效地減少CPU計算時間及節(jié)省計算機(jī)內(nèi)存。
關(guān)鍵詞：雙頻天線；H-MRTD方法；FDTD方法；微機(jī)械；UPML吸收邊界條件
中圖分類號：TN823 文獻(xiàn)標(biāo)識碼：A
1 引言1
最近，貼片天線的研究已經(jīng)聚焦于減小貼片的尺寸，這對于商業(yè)和軍事應(yīng)用非常重要。據(jù)顯示，在共振模電場為0的地方引進(jìn)一個短路面或一個部分短路面[1-3]，或者在反饋點(diǎn)附近引進(jìn)一個短針[4]，這樣就可以顯著減小微帶天線的諧振頻率。使用雙棧短路貼片可以獲得雙頻解[5]。然而，使用堆棧存儲