Title Metallic Rectangular Parallelepiped. Citation Korea-Japan Microwave Conference 20. must be obtained from the IEEE.

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1 NAOSITE: Nagaaki Univerit' Ac Title Author() Numerical Anali of Electromagnet Metallic Rectangular Paralleleied Taguchi, Mituo; Sanabe, Yuta; Hama Citation Korea-Jaan Microwave Conference 20 Iue Date URL Right htt://hdl.handle.net/10069/ IEEE. Peronal ue of thi ma ermiion to rerint/reublih thi uroe or for creating new collective work lit, or to reue an corighted mut be obtained from the IEEE. Thi document i downloaded htt://naoite.lb.nagaaki-u.ac.j

2 TH02-2 Numerical Anali of Electromagnetic Field Ditribution in Hollow Metallic Rectangular Paralleleied with Roof Mituo TAGUCHI 1) Yuta SANABE 2) and Yauhi HAMADA 3) 1) Facult of Engineering, Nagaaki Univerit 2) Graduate School of Science & Technolog, Nagaaki Univerit 3) Mada Motor Cororation 1), 2) 1-14 Bunko-machi, Nagaaki-hi, , Jaan 3) 3-1 Shinchi, Fuchu-cho, Aki-gun, Hirohima, , Jaan 1) 2) Abtract The hollow metallic rectangular aralleleied with roof i ecited b a diole antenna located near it. The induced ditribution on the urface of aralleleied and the neighboring electric field are numericall invetigated b uing the electromagnetic imulator WIPL-D baed on the method of moment. The calculation frequenc i 945 MH. Inde Term metallic bo, WIPL-D, method of moment, ditribution, electric field. I. INTRODUCTION With the develoment of numerical anali method, man kind of electromagnetic imulator are ued for the anali of antenna [1]. Author have calculated the center-fed hollow clindrical diole antenna and the center-fed olid diole antenna b uing the electromagnetic imulator WIPL-D and AWAS baed on the method of moment [2]. Then, author have calculated ome microtri antenna b uing the electromagnetic imulator WIPL-D and IE3D baed on the Method of Moment, Micro-Strie baed on the TLM (Tranmiion Line Matri) method and Fidelit baed on the FDTD (Finite Difference Time Domain) method [3]-[7]. Thee imulator are alicable to the antenna coniting of conducting and dielectric material with finite ie. The inut imedance and the radiation characteritic of the antenna have been calculated and comared with the meaured data. Due to the develoment of GUI (grahical uer interface) of the imulator, the electromagnetic field ditribution in the vicinit of antenna i eail oberved. B uing GUI, the uer can eail undertand the hical henomenon and deign the antenna. Recentl, the recetion antenna of the AM and FM radio broadcating and the GPS (Global oitioning tem), the antenna of the kele entr tem and the antenna of ETC (electronic toll collection) and VICS (Vehicle Information and Communication Stem) are intalled in a lot of car. In the kele entr tem, for eamle, the electromagnetic wave tranmitted from the ke outide of car i weak and the trength of electromagnetic field varie within a car [8]. Therefore, it i imortant to invetigate the relation between the electromagnetic field ditribution and the tructure of the car. Author have numericall invetigated the electric field ditribution within the hollow metallic rectangular aralleleied with an aerture on it to when the horiontal olaried wave i radiated from the diole antenna located near the aralleleied [9]. In the reference [9], it i how that the ditribution on the infinitel thin conductor i ame a the ummation of on inner and outer conductor of thickne 1 mm. Then the relation between the ditribution on the aralleleied and the electric field ditribution within it i dicued. In thi aer, the hollow metallic rectangular aralleleied with roof i ecited b a diole antenna located near it. The roof i located above the aerture of the analtical model in reference [9] and uorted b four illar from the edge of aerture. The induced ditribution on the urface of conductor and the electric field ditribution within the aralleleied are numericall analed. In the numerical anali, the electromagnetic imulator WIPL-D baed on the method of moment i ued [10]. The calculation frequenc i 945 MH. II. ANALYTICAL MODEL Figure 1 how the analtical model of the hollow metallic rectangular aralleleied with roof. The electromagnetic field i radiated from the diole antenna. The radiu r of the diole antenna i 1 mm, and it length i 160 mm. The ditance D between the aralleleied and the diole i 1,020 mm. The diole antenna and the rectangular aralleleied are located above the infinite ground lane. The height h2 of diole antenna i 300 mm. The rectangular aralleleied i located 100 mm (h1) above the X/07/$ IEEE Korea-Jaan Microwave Conference

3 ground lane. The arameter of aralleleied are a follow. L = 1,300 mm, a = 400 mm, b = 350 mm, c = 350 mm, e = 550 mm, w1 = 350 mm, w2 = 400 mm, and w3 = 100 mm. The height of illar h3 i 230 mm. The thickne of conductor i t = 1 mm. The calculation frequenc i 945 MH. In the numerical anali, the electromagnetic imulator WIPL-D baed on the method of moment i ued. In the numerical anali b WIPL-D, the diole antenna i ecited b the delta function generator. III. RESULTS AND DISCUSSION The relation between the ditribution and the electric field ditribution will be dicued. Figure 2 and 3 how the amlitude ditribution on the outer and inner urface of aralleleied, reectivel. On the inner urface of conductor, the tanding wave ditribution of i induced in the direction of diole antenna. Since the directl incident wave doe not eit, the induced on the inner urface ma be due to the diffraction through the aerture. Figure 4 and 5 how the electric field ditribution in the vertical lane = 100 mm and 210 mm, reectivel. Figure 6, 7 and 8 how the electric field ditribution in the horiontal lane = 150 mm, 300 mm, and 400 mm, reectivel. Within the aralleleied, the vertical () comonent of electric field i trongl ecited, although the horiontall olaried electromagnetic wave i incident. IV. CONCLUSION The hollow metallic rectangular aralleleied with roof ha been ecited b the horiontall olaried diole antenna located near it. The induced ditribution on the aralleleied and the electric field ditribution within it have been numericall analed b the electromagnetic imulator WIPL-D baed on the method of moment. The calculation frequenc i 945 MH. On the inner urface of aralleleied, the horiontal comonent of i induced. Within the aralleleied, the vertical comonent of electric field i trongl ecited due to the horiontal comonent of induced. The mode of the vertical comonent of electric field deend on the geometr of conducting bo. In the net te, the electromagnetic field ditribution within the hollow rectangular aralleleied will be analed in the cae of verticall olaried wave incidence. The comarion of the calculated electric field ditribution and the meaured reult i alo needed. Reference: [1] M. Taguchi, T. Fujimoto and K. Tanaka: Comarion of numerical olution of hollow clindrical diole antenna, Proc. of 18 th Annual Review of Progre in Alied Comutational Electromagnetic, , March [2] M. Taguchi, Ue and evaluation of electromagnetic imulator from the tandoint of antenna deign, Journal of IEICE, vol. 83, no. 11, , Nov (in Jaanee). [3] Mituo Taguchi, T. Imada, E. Nihiama, T. Fujimoto, and M. Aikawa, Anali of microtri antenna b uing electromagnetic imulator - Fidelit b Zeland and HFSS b HP -, Technical Reort of IEICE, AP99-9, Ma 1999 (in Jaanee). [4] M. Taguchi, H. Morihita, M. Hiroe, and M. Haneihi, Anali of rectangular microtri antenna for circular olariation b uing electromagnetic imulator, Technical Reort of IEICE, AP ,.55-58, Jan (in Jaanee). [5] M. Taguchi, H. Morihita, M. Hiroe, Anali of microtri antenna b uing electromagnetic imulator, Technical Reort of IEICE, MST ,.13-18,Set (in Jaanee). [6] K. Ichikawa, T. Tanaka, H. Morihita, and M. Taguchi, Numerical anali of microtri antenna b uing electromagnetic imulator, Technical Reort of IEICE, MST ,.31-36,Set (in Jaanee). [7] M. Taguchi, K. Ichikawa, H. Morihita, T. Tanaka, M. Hiroe, and T. Ihione, Numerical Anali on Benchmark of Microtri Antenna MSA-4 b Uing Electromagnetic Simulator, Technical Reort of IEICE, MST , ,Set (in Jaanee). [8] htt:// [9] Y. Sanabe, Y. Hamada, and M. Taguchi, Numerical anali of electromagnetic field ditribution in hollow metallic rectangular aralleleied with aerture, Technical Reort of IEICE, Set (to be ublihed). [10] WIPL-D Pro v6.4 Uer Manual,WIPL Ltd., e aerture w3 conductor (thickne=t) h3 w2 diole antenna a b c w1 D h2 h1 r o L infinite ground lane Figure 1. Hollow metallic rectangular aralleleied with roof. a=400mm, b=350mm, c=350mm, e=550mm, D=1,020mm, h1=100mm, h2=300mm, h3=230mm, L=1,300mm, w1=350mm, w2=400mm, w3=100mm, =160mm, r=1mm. 30

4 [ma] (a) comonent (a) comonent (b) comonent Figure 2. Current amlitude ditribution on outer urface of aralleleied. (b) comonent [ma] (c) comonent Figure 4. Electric field ditribution in vertical lane = 100 mm. (a) comonent rent (b) comonent Figure 3. Current amlitude ditribution on inner urface of aralleleied. 31

5 (a) comonent (a) comonent (b) comonent (b) comonent (c) comonent Figure 7. Electric field ditribution in horiontal lane = 300 mm. (c) comonent Figure 5. Electric field ditribution in vertical lane = 210 mm. (a) comonent (a) comonent (b) comonent (b) comonent (c) comonent Figure 6. Electric field ditribution in horiontal lane = 150 mm. (c) comonent Figure 8. Electric field ditribution in horiontal lane = 400 mm. 32