PCB PCB. PCB P/G de-cap [2],[3]., de-cap ESL(Equivalent Series Inductance) [3],. P/G [4], P/G. de-cap P/G, PCB.. 단일비아를이용한 P/G 면공진상쇄 2-1 P/G 면공진현상 PCB

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1 韓國電磁波學會論文誌第 20 卷第 12 號 2009 年 12 月論文 PCB Improved Characteristic of Radiated Emission of a PCB b Using the Via-Hole Position 김리진 이재현 Li-Jin Kim Jae-Hun Lee 요약 4 PCB(Printed Circuit Boards) P/G(power/ground) (RE: Radiated Emission). 4 PCB, PCB (radiation) RE,. Abstract The cancellation method of P/G(power/ground) plane resonances which are generated between the power plane and the ground plane in a 4-laer PCB(Printed Circuit Boards) with a via-hole for the improvement of the RE(Radiated Emission) characteristic is presented. The validit of the proposed method was confirmed from simulation and measurement of performances of signal transmission characteristic, intensities of edge-radiation and radiated emission of PCB with a via-hole. Ke words : Through-Hole Via, Power/Ground Plane Resonance, Via-Hole Position, Radiated Emission, Edge Radiation. 서론,., EMC(Electromagnetic Compatibilit). PCB, PCB. PCB (through-hole) (via)., (ground plane) (power plane),. SI(Signal Integrit), PCB RE [1] [4]. P/G. (spice) [1], (band-stop filter) [2], TLM(Transmission Line Method) [3], IT (IITA-2009-(C )) * (Department of Radio Science & Engineering, Chungnam National Universit) : :

2 PCB PCB. PCB P/G de-cap [2],[3]., de-cap ESL(Equivalent Series Inductance) [3],. P/G [4], P/G. de-cap P/G, PCB.. 단일비아를이용한 P/G 면공진상쇄 2-1 P/G 면공진현상 PCB (1) PCB [5]. f mn æ m ö æ n ö = ç [GHz] m a + ç b re r è ø è ø (1) a b, m n mm 2 PCB P/G (1) 1. PCB 1 (dual-mode). 표 1. P/G Table 1. Modes and frequencies of the P/G plane resonance. (m, n) [GHz] (0, 1), (1, 0) 0.71 (1, 1) 1.01 (0, 2), (2, 0) 1.43 (1, 2), (2, 1) 1.61 (a) (a) Top view (b) (b) Side view 그림 1. PCB Fig. 1. PCB with a through-hole via. 2-2 단일비아를이용한 P/G 면공진제어 P/G (P ) 100(P ) mm 2, FR-4(μ r=1, ε r=4.4),,, 4. (h) 0.6 mm,,, 35 μm, (w) 1 mm. (R=1 mm, r=0.6 mm). (T, T ). 2 (port), (2) [6]. Z pp ( ) cos ( ) jwm d C C cos k T k T = å å P P k + k - k m n m n m= 0 n= 0 m n 1273

3 韓國電磁波學會論文誌第 20 卷第 12 號 2009 年 12 月 2 é æ L öù é æ L öù êsincç km ú êsincç k n ú 2 ë è øû êë è 2 øúû (2) m n, d, P P,. T T, ( ), L L, ( ). C m C n m=0 C m =1, m 0 C m = n=0 C n =1, n 0 C n = 2.. k (wavenumber),, k = mp P, k n = np P, k = w me. m Z pp P/G. Z pp (2) 0, 0, (1)., (2) Z pp, 0 0,. 0, (cosine) (sinc) P 2P m = or n = T L T L., PCB (P, P ) (L, L ) mm, (3) 그림 2. Fig. 2. Parallel-plate with ports. (3). 0 (4). P P m = or n = 2T 2T PCB (P, P ) (μ r, ε r ), ( : L, L ), (4), T, T., T, T P/G. (5). P P T = or T = 2m 2n (5) (5), P/G. 2-3 시뮬레이션및측정결과 1 P/G mm 2 PCB P/G (5). (1, 1) (m=1, n=1), (5) (T, T )=(50, 50). P/G FEM (Finite Element Method) 3 Ansoft HFSS. Agilent N5230A VNA, mm 2 PCB (5). 2., - 50 mm - (1, 0). (4) 1274

4 PCB 그림 3. Fig. 3. Setup for measurement of scattering parameter. (a) (T, T )=(30, 30) (a) (T, T )=(30, 30) 표 2. P/G Table 2. Position of the via-hole to cancel the P/G plane resonant mode. (m, m) (T, T ) (1, 0) 0.71 GHz (50, ) (0, 1) 0.71 GHz (, 50) (1, 1) 1.01 GHz (50, 50) (2, 0) 1.43 GHz (25, ) (0, 2) 1.43 GHz (, 25) (2, 1) 1.61 GHz (25, 50) (1, 2) 1.61 GHz (50, 25) 4(a) (30, 30), 4(b) (50, 50).. 4(a) 2 P/G., 4(b) 0.71 GHz 1.01 GHz, 1.61 GHz. (50, 50) 1.43 GHz. P/G.. 비아위치에따른 RE 세기 3-1 PCB 개방모서리방사 P/G 5 (b) (T, T )=(50, 50) (b) (T, T )=(50, 50) 그림 4. P/G Fig. 4. Variation of the P/G plane resonance frequencies due to change of the via-hole position. 그림 5. Fig. 5. Observation plane of field distribution... PCB

5 韓國電磁波學會論文誌第 20 卷第 12 號 2009 年 12 月 (T, T ) (GHz) (30, 30) (50, 50) PCB 그림 6. PCB Fig. 6. Radiated field distribution at the edge of PCB. (30, 30) P/G, (50, 50) 1.43 GHz. 그림 8. 6 RE Fig. 8. Measurement of radiated emission at 6 directions. choic chamber). PCB 1 m, PCB, 50 Ω. 3-2 RE 시뮬레이션및측정결과 PCB RE 7. RE 5 8 5( ) m 3 (ane- (a) (T, T )=(30, 30) (a) (T, T )=(30, 30) (a) (a) Setup for measurement (b) (b) Picture of measurement setup 그림 7. RE Fig. 7. Setup for measurement of radiated emission. (b) (T, T )=(50, 50) (b) (T, T )=(50, 50) 그림 9. RE Fig. 9. Radiated emission intensit due to the via-hole position. 1276

6 PCB PCB RE MHz 1 GHz (log periodic antenna), 1 GHz 2 GHz (horn antenna). PCB 1 m. RE 8 6 RE 9. 9 RE RE. (30, 30) (50, 50) (30, 30) RE. RE, (EMI: Electromagnetic Interference). RE PCB EMI.. 결론 PCB P/G RE. PCB P/G,., P/G, PCB PCB EMI. 참고문헌 [1] Jun So Pak, Jing Ook Kim, Jung Gun Bun, Hee Jae Lee, and Joung Ho Kim, "Coupling of throughhole signal via to power/ground resonance and ecitation of edge radiation in multi-laer PCB", Proc. IEEE Int. Smp. Electromag. Compat., vol. 1, pp , Aug [2] Jun So Pak, Masahiro Aoagi, Katsua Kikuchi, and Joung Ho Kim, "Band-stop filter effect of power/ ground plane on through-hole signal via in multilaer PCB", IEICE Trans. Electron., vol. E89-C, no. 4, Apr [3] Jun So Pak, Hung Soo Kim, Jun Woo Lee, and Joung Ho Kim, "Modeling and measurement of radiated field emission from a power/ground plane cavit edge ecited b a through-hole signal via based on a balanced TLM and via coupling model", IEEE Trans. on Advanced Packaging, vol. 30, no. 1, Feb [4] Li-Jin Kim, Su-Han Kim, and Jae-Hun Lee, "Variation of the dembedding via-hole discontinuit due to the resonance of power/ground plane", Asia- Pacific Microwave Conference, Sec. J5, Dec [5] David M. Porza, Microwave Engineering 3 rd Edition, New York: Wile-Intersciences, pp , [6] T. Okoshi, Planar Circuits for Microwaves and Lightwaves, Berlin, German: Springer-Verlag,

7 韓國電磁波學會論文誌第 20 卷第 12 號 2009 年 12 月 : ( ) : [ 주관심분야 ] PCB EMI/EMC, RF : ( ) : ( ) : ( ) : : [ 주관심분야 ] PCB EMC/EMI, RF, Magnetostatic Wave Device 1278