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1 韓國電磁波學會論文誌第 21 卷第 12 號 2010 年 12 月論文 Dual-Band Compact Broad Band-Pass Filter with Parallel Coupled Line 최영구 윤기철 이정훈 홍태의 Young-Gu ChoiBhanu Shrestha*Ki-Cheol Yn**Jeong-Hun Lee** Tae-Ui Hong*** 요약.. T GHz 60 %, 16.2 GHz 60 %. 0.4 db 17.4 db, 0.62 db 19.8 db. Abstract In this paper, the dual-band compact broad bandpass filter using parallel coupled line is proposed. The proposed filter has reduced size and can be controlled bandwidth. And it is also possible to operate in the dual-band purpose. Futhermore, the inserted bandstop fiilter with T-type configuration is also possible to operate in the same purpose. The dual-band bandpass filter has the first operating frequencies and its bandwidth which are 5.8 GHz and 60 % respectively and the second operating frequency and the bandwidth are 16.2 GHz and 60 % respectively. The insertion loss and the return loss of the first frequency has 0.4 db and 17.4 db and the insertion loss and the return loss of the second frequency has 0.62 db and 19.8 db, respectively. Key words : Dual-Band, Broad Band, Coupling Cfficient, Compact Size, T-Type Bandstop Filter. 서론 [1],[3]., (multi-structure),., [4]. R&D (Rolling Stock Technology Division, SMRT) * (Department of Wireless Communication and Engineering, Kwangwn University) ** (Inspection Division, Korea Rolling Stock Technical Corporation) *** (Business Support Division, Korea Institute of Ceramic Engineering & Technology) : : ( :

2 韓國電磁波學會論文誌第 21 卷第 12 號 2010 年 12 月,.,. (coupled line filter). 20 %, [5]., [5]. (J) (inverter), ABCD (matrix),., T-.,,. 4.8 % [6], 60 % 표 1. Table 1. Characteristic of even and odd mode at parallel coupled line BPF. Modes Impedance Value[Ω] Even Odd Z Z 1, Z 2, Z Z Z 1, Z 2, Z / (coupling) [6]. 1 1 (even) (odd) (mode), 그림 1. Fig. 1. Structure of a band pass filter(bpf) with parallel coupled line. 그림 2. (: 4.6 %) Fig. 2. Simulation and measurement results of a BPF with parallel-coupled line(fbw=4.6 %). 1424

3 표 2. Table 2. Results of BPF with parallel coupled line. [GHz] [%] [db] (S 21) (S 11) [db] (S 21) (S 11) 평행결합선로구조의소형광대역이중대역의대역통과필터, (gap). /. /, (coupling) 3,,., T 이론및설계 3(a) / 90 (Z 2). 180 (Z 2, Z 3) T- (Z s)., 180 (Z 1, Z 3 ) (Z 2 ) J-. 3(b) (Z o ) n (Z 1 =Z 3, Z 2 ) (Z s ) (C j) J- (a) (a) Structure of the filter (b) J- (b) J-inverter and the equivalent circuit of the filter 그림 3. Fig. 3. The proposed compact dual-band broad BPF with parallel-coupled line.. (1) ABCD [6]. éa ê ê êc ë B ù ú ú = Dú û éz + Z j ì 4Z Z ê cosq - í- ( Z )sinq + ê Z 2 î Z ê 2 Z + Z ê j sinq cosq êë Z Z 2 cos q üù ýú sinq þú ú ú úû (1) J- (2) [6]. 1425

4 韓國電磁波學會論文誌第 21 卷第 12 號 2010 年 12 月 (2) (2) Δ (FBW), g i (low- pass) (prototype) [6]. J- 90, (,, ) J- (even) (odd) (mode). (3) [6]. j=0 to n j=0 to n (3) (3) Z Z, Z o (feeding-line), Y o J J-. (3), [6], ADS line calculation. (symmetric). n.,. n, 3.,. Z 2. 3 Z , Z 2 90 C j Z J- 3. C j Z 2. C S=C j (4) (4) (C j), [6]. () 3 4 EM(IE3D). EM (). 3 4., 4.8 % 60 %. 3-dB. 표 3. Table 3. Bandwidth variation with value of gap-distance. [%](f 1, f 2) S[m]() C j[mm]

5 (a) (f 1, f 2) (a) The bandwidth variation as a function of the gap-distance(f 1, f 2) (b) S-(f 1) (b) The S-parameter as a function of frequency(f 1) [7],. T- 30 (Z 3) 90, 30 <45 Z 3 (Z s) [7]., T- (Z 1, Z 3) f 1 f 2, n (Z s)., n (Z s) 3(a) T- f 1 (out-band) T- f 2 (in-band). 5. () 3- db, f GHz( : db) (c) S-(f 2) (c) The S-parameter as a function of frequency(f 2) 그림 4. Fig. 4. The bandwidth variation as a function of gapdistance. (Z 3) T- (stub), T- 그림 5. T- Fig. 5. Experimental results of the equivalent T-type bandstop filter. 1427

6 韓國電磁波學會論文誌第 21 卷第 12 號 2010 年 12 月 0.34 db 31.3 db, f GHz( : 3 db) 5.1 db 19.9 db, f 1 f GHz 33.3 db. T n J-. T-. [8]. 2-2 제작및실험 표 4. Table 4. Results of the proposed a dual-band broad BPF with parallel coupled line. [GHz] [%] [db] (S 21) (S 11) [db] (S 21) (S 11) , HP-8510 C. 3-dB. 4, % 3.6 GHz., 11.3 GHz 24.1 db 20.2 db ADS 2005 A IE3D(Ver. 10.0) (a) (a) Parallel coupled line structure of a BPF 그림 6. (: 60 f 1, f 2) Fig. 6. Simulation and measurement results of the proposed dual-band broad BPF(FBW: 60 f 1, f 2). (b) (b) Parallel coupled line structure of a BPF 그림 7. Fig. 7. Fabricated BPF with parallel coupled line. 1428

7 . 2.54, 0.54 mm.. 고찰 (via-hole).,,,,..,., T-. f 1 f 2 () ( GHz) n., [8]. [8] T-. T 표 5. Table 5. The size of bandpass filter with parallel coupled line. [mm] Conventional New type 표 6. Table 6. Comparison for size of the filter. [GHz] [mm] f 1 f 2 This work [9] [10] [9]. f 1,., [10] (self-feedback) SIR(Stepped Impedance Resonator), SIR.. 결론.,,. ABCD J-,., T- 1429

8 韓國電磁波學會論文誌第 21 卷第 12 號 2010 年 12 月., 4.8 %, 60 %,. 60 % 5.8 GHz 0.4 db 17.4 db, 16.2 GHz 0.62 db 19.8 db. ISM (LAN) (SNG: Satellite News Gathering)., MMIC. 참고문헌 [1], "DSRC ITS",, 43, TC(4), pp , [2] H. Oh, C. Yae, D. Ahn, and H. Cho, "5.8 GHz DS- RC packet communication system for ITS services", IEEE Vehicular Technology Conference, pp , Sep [3],,,,,, "5.8 GHz (DSRC) ",, 25(8A), pp , [4] M. Mokhtaari, K. Rambabu, J. Bornemann, and S. Amari, "Advanced stepped-impedance dual-band filters with wide second stopbands", in Proc. Asia- Pacific Microwave Conf., pp , Dec [5] K. C. Yn, S. Y. Oh, H. Lee, K. M. Oh, and J. C. Lee, "Design of a compact broad band-pass filter using parallel coupled structure", in Proc. Asia-Pacific Microwave Conf., pp. 1-4, Dec [6] J. S. Hong, M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, John Wiley & Sons, [7] K. C. Yn, J. C. Lee, "Design of a 5.8 GHz narrow band-pass filter with second harmonic suppression using the open stubs", Microwave and Optical Tech. Lett., vol. 50, no. 7, pp , Apr [8],, "2 5.8 GHz ",, 18(10), pp , [9],,, " ", ITS, 7(6), pp , [10] X. Chen, G. Hand, R. Ma, J. Gao, and W. Zhang, "Design of balanced dual-band bandpass filter with self-feedback structure", ETRI Journal, vol. 31, no. 4, pp , Aug : () : () : () : R&D [ 주관심분야 ] RF Bhanu Shrestha : () : () : () : [ 주관심분야 ] RFIC/MMIC/HMIC/IPD 1430

9 2005 2: () : () : [ 주관심분야 ] Metamaterial,,,, : () : () : () : : : [ 주관심분야 ],, : () : () : [ 주관심분야 ],, 1431

韓國電磁波學會論文誌第 21 卷第 11 號 2010 年 11 月 (a) (a) Frequency response (b) (b) Corresponding pole-zero diagram 그림 1. Fig. 1. Characteristic of multi-band filte

韓國電磁波學會論文誌第 21 卷第 11 號 2010 年 11 月 (a) (a) Frequency response (b) (b) Corresponding pole-zero diagram 그림 1. Fig. 1. Characteristic of multi-band filte 韓國電磁波學會論文誌第 21 卷第 11 號 2010 年 11 月論文 2010-21-11-09 A Filter Synthesis Method for Multi-Band Filter Design 이혜선 이자현 임영석 Hyesun LeeJahyeon LeeYeongseog Lim 요약 LC.,,., LC. LC GSM(880960 MHz), ISM(2,4002,500

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