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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 216 Mar.; 27(3), ISSN (Print) ISSN X (Online) LPDA Design of a Planar LPDA Antenna with Light-Weight Supporting Structure for Installing on an Aircraft 박영주 박동철 Young-Ju Park Dong-Chul Park* 요약 LPDA(Log-Periodic Dipole Array).,. Peek(Polyether ether ketone), LPDA.. LPDA 1-dB, GHz(7.3:1), GHz(8.2:1)..5 3 GHz 6.77 dbi, 6.55 dbi.. Abstract This paper proposes a planar Log-Periodic Dipole Array(LPDA) antenna with light-weight supporting structure for installing on an aircraft. The proposed antenna is designed by applying a planar skeleton supporting structure that has light-weight for an aircraft and is capable of withstanding structural vibration. The material of the planar skeleton supporting structure is a Polyether ether ketone(peek) which has excellent characteristics on strength and temperature. The proposed antenna is fabricated by attaching the radiating elements of the LPDA on both sides of the supporting structure. The changed input impedance due to the dielectric material of the supporting structure was compensated for by controlling the distance and length of several radiating elements. The 1-dB return loss bandwidths of the designed planar LPDA antenna with light-weight supporting structure are obtained as GHz(7.3:1) in the simulation and GHz(8.2:1) in the measurement. The average gains in.5 3 GHz band are 6.77 dbi in the simulation and 6.55 dbi in the measurement. Therefore, we confirm that the designed antenna is appropriate to be installed on an aircraft due to its light-weight structure and wideband directional radiation characteristics. Key words: LPDA Antenna, Planar Antenna, Aircraft Installation, Skeleton Supporting Structure. 서론 HF. UHF (Agency for Defense Development) * (Department of Radio and Information Communications Engineering, Chungnam National University) Manuscript received December 3, 215 ; Revised February 23, 216 ; Accepted March 3, 216. (ID No ) Corresponding Author: Dong-Chul Park ( c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 253

2 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 3, Mar L. (Log-Periodic Dipole Array: LPDA).,. UHF LPDA 3 [1], UHF [2],, [3] [5]. LPDA Conductor-Backed Co-Planar Waveguide(CPWG). UHF LPDA,. LPDA LP- DA., LPDA. LPDA (skeleton) [6],. 1-dB, 6.5 dbi.. 평면형 LPDA 안테나설계 2-1 LPDA. LPDA, 경량화지지구조를갖는평면형 LPDA 안테나 설계및입력임피던스매칭 LPDA. LPDA..5 3 GHz 6:1, 6.5 dbi. LPDA Carrel [7]. (σ) (τ), 2 σ=.5, τ= LPDA. 3D EM (CST Microwave Studio 213). 2.5 mm Feed z y x Aluminum (thickness : 1 mm) 243 mm 2.5 mm 3 mm 2.5 mm 그림 1. LPDA Fig. 1. Structure of the basic planar LPDA antenna. 31 mm 254

3 LPDA 표 1. LPDA ( ) Table 1. Characteristics for the designed basic LPDA antenna(simulation). (GHz) (1-dB ) LPDA (6.74:1) (dbi) 7.71 HPBW( ) E-plane 69.6 H-plane (mm) LPDA.. LPDA. LPDA. UHF LPDA,., LPDA. 2 feed line,., Peek(Polyether ether ketone) (ε r =3.3, tan δ=.2)., Peek 3.8 mm. (G) (W), 2 4 mm. LPDA 2. 1 LPDA 그림 2. LPDA Fig. 2. Structure of planar LPDA antenna with light-weight supporting structure., Peek (a) GHz. 3(b) feeder., mm 3.3 mm GHz 1-dB.. LPDA. 2 Peek 255

4 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 3, Mar Return loss (db) Before tunning After tunning (a) (a) Return loss before and after tuning. (a) 1 (a) Supporting structure 1 (b) (b) Modified distance between radiation elements 그림 3. Fig. 3. Return loss before and after tuning and modified distance between radiation elements. z x. z x. Peek ( 1) ( 2) 4. 1, z, x. 4(b), 2.5 mm 4 mm.., (b) 2 (b) Supporting structure 2 그림 4. LPDA Fig. 4. Supporting structure of the LPDA antenna.. (skeleton), , 1.6 GHz 7 db. 1.6 GHz 256

5 LPDA Return loss (db) Before tunning After tunning 그림 5. LPDA 2 Fig. 5. Return loss before and after tuning of LPDA antenna supporting structure 2. Feed z y x Aluminum (thickness : 1mm) 5.8mm 354mm 2.5mm 4mm Supporter : Peek(er : 3.3, thickness: 3.8mm) (a) (a) Structure of the design antenna 31mm mm, 13.6 mm. 12, GHz. z y x Supporter : Peek(er : 3.3, thickness: 3.8mm) Semi-rigid coaxial cable (UT-85) SMA connector 2-2 경량화지지구조를갖는평면형 LPDA 안테나제작및측정 LPDA. 2 LPDA 6. Peek... semi-rigid (UT-85) LPDA. LP- DA 354 mm 31 mm 5.8 mm. (b) (b) Fabricated antenna 그림 6. LPDA Fig. 6. LPDA antenna with light-weight supporting structure. 7 LPDA., 1 db, GHz, LPDA discrete port,., 257

6 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 3, Mar Return loss (db) Simulation Measurement 그림 7. LPDA Fig. 7. Return loss of the fabricated LPDA antenna.,. 1-dB GHz(7.3:1), GHz(8.2:1). 8.,.5 3 GHz ( 8(a)) 6.77 dbi, 6.55 dbi., 8(b), E- 62.6, 63.3, H , , 1.3, 2.2, 3 GHz 표 2. LPDA Table 2. Characteristics for the designed LPDA antenna. (GHz) 2.8(7.3:1) 3.6(8.2:1) (dbi) HPBW( ) E-plane H-plane (mm) Peak gain (dbi) HPBW (deg.) Simulation Measurement (a) (a) Peak gain E-plane(simulated) E-plane(measured) H-plane(simulated) H-plane(measured) (b) (b) Half power beamwidth 그림 8. LPDA Fig. 8. Peak gain and half-power beamwidth of the fabricated LPDA antenna.. E, H-, E- H- LPDA. 2 LPDA. 1 LPDA LPDA, LPDA. 258

7 LPDA 1 33 q (deg.) 3.5 GHz 1.3 GHz 2.2 GHz 3 GHz 1 33 q (deg.) 3.5 GHz 1.3 GHz 2.2 GHz 3 GHz Realized gain (dbi) Realized gain (dbi) [Simulation] (a) E- (a) E-plane pattern [Measurement] 1 33 f (deg.) 3.5 GHz 1.3 GHz 2.2 GHz 3 GHz 1 33 f (deg.) 3.5 GHz 1.3 GHz 2.2 GHz 3 GHz Realized gain (dbi) Realized gain (dbi) [Simulation] [Measurement] (b) H- (b) H-plane pattern 그림 9. LPDA Fig. 9. Radiation pattern of the fabricated LPDA antenna.. 결론 LPDA. LPDA,.,. LPDA,. LPDA,. 259

8 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 3, Mar References [1] C. A. Balanis, Antenna Theory Analysis and Design 3rd Ed., Wiley Interscience, pp , 25. [2] R. Pantoja, A. Sapienza, and F. M. Filho, "A microwave planar log-periodic dipole array antenna", IEEE Trans. on Antennas Propag. vol. 35, no. 1, pp , Oct [3],,, " ",, 14(11), pp , [4],, " ",, 19(3), pp , [5] Ga A. Casula, P. Maxia, Gmontisci, G. Mazzarella, and F. Gaudiomonte, "A printed LPDA fed by a coplanar waveguide for broadband applications", IEEE Antennas and Wireless Proga. Lett., vol. 12, pp , 213. [6],, " LPDA ",, pp , [7] R. Carrel, "Analysis and design of the log-periodic dipole antennas", Ph.D. dissertation, University of Illinois, Urbana, IL, USA, [8],,,,,, " ",, 25(7), pp , : ( ) : ( ) : 29 3 : [ 주관심분야 ], : ( ) : ( ) : University of California, Santa Barbara ( ) : Ruhr University, Bochum, Germany : IEEE MTT Korea Chapter Chairman : IEEE EMC Korea Chapter Chairman 2 21 : : Wireless 1976 : [ 주관심분야 ] Microwave and Millimeterwave Passive Components, Antennas, EMI/EMC 26

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