(JBE Vol. 21, No. 3, May 2016) (Regular Paper) 21 3, (JBE Vol. 21, No. 3, May 2016) ISSN
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1 (JBE Vol. 21, No. 3, May 2016) (Regular Paper) 21 3, (JBE Vol. 21, No. 3, May 2016) ISSN (Online) ISSN (Print) FM CP-Ring a), b) Study and Adaptation of FM CP-Ring Antenna Radiation Pattern Transmission Facility Soocheol Choi a) and Kiryang Cho b) FM(Frequency Modulation) CP(circularly polarized)-dipole CP(circularly polarized)-ring,., CP-dipole (4 ), CP-ring 5 9dB., 3 CP-ring. Abstract In this paper, we investigate the radio wave radiation pattern to measure the actual field strength for the transmission dipole and the CP-ring being used in our country as FM station, and the comparison was for field application. Compare results, If the transmitting station and the relay station which is located in the middle of a service area has been a useful CP-dipole (four directions). CP-ring having a directivity because the reflection effect of the tower was able to adjust the orientation to prevent the spread of menstrual another service area in the main direction was able to radiate high propagation 5~9dB. Especially, If the transmitting station and the relay station is located on one side of the service area for radiating radio waves in three directions by using the CP-ring s focus the orientation of the in populated areas and road area can improve the broadcast reception environment. Keywords : CP-ring, CP-dipole, radio wave radiation pattern, four direction CP-dipole a) (KBS) b) (Chonnam National University) Corresponding Author : (Kiryang Cho) krcho@jnu.ac.kr Tel: ORCID: Manuscript received March 1, 2016; Revised March 15, 2016; Accepted March 15, 2016.
2 1 : FM CP-Ring (Soocheol Choi et al.: Study and Adaptation of FM CP-Ring Antenna Radiation Pattern Transmission Facility). FM(Frequency Modulation) 88MHz 108MHz (FM) KHz AM(Amplitude Modulation), Hi-Fi FM., RF(Radio Frequency).., EIRP(Effective Isotropic Radiated Power) [1 3]. ( FM ) CP-dipole CP-ring CP-ring. FM CP-dipole CP-ring [4 6], FM.. FM 1. CP-dipole CP-dipole.,,. 1. CP-dipole Fig. 1. CP-dipole CP-dipole 1 4, CP-ring. (power rating) FM CP-dipole (combine). CP-dipole 4, 2 [7]., (tilt) 2 4 (bay).
3 (JBE Vol. 21, No. 3, May 2016) CP-dipole Fig. 2.. Horizontal radiation pattern of 4-Directional CP-dipole 2. CP-ring CP-ring 3, ice cover. 3. CP-Broadband, CP-ring Fig 3. CP-Broadband, CP-ring Type, CP-dipole. 4 CP-ring [8] 2 CP-dipole, 4. CP-ring Fig. 4. Horizontal radiation pattern of CP-dipole CP-ring,.., 1λ 0, 1λ,. TV(Television) CP-dipole (branch cable). CP-ring 4 (side mount), CP-dipole,.. FM 1.
4 최수철 외 1인: 철탑의 반사 효과에 따른 FM CP-Ring 안테나의 방사 패턴 고찰 및 현장 적용 방안 (Soocheol Choi et al.: Study and Adaptation of FM CP-Ring Antenna Radiation Pattern Transmission Facility) 준 안테나를 이용하여 기존의 FM 전계 강도 측정은 표 준 높이에서 고정하여 측정을 실시한다. 이러한 고정 측 정 방법으로 안테나 패턴을 측정하면 측정 포인트 수가 많 아지고, 측정 지점 사이에 이동 시간이 추가되어 현장에서 기 는 상당한 어려움이 따른다. 준 407 준 등 6매체를 1R(표 )FM, 2R, 1FM, 2FM, EFM, MBC표 결합하여 CP-dipole 안테나를 통해 송출하고 있으며, 각 매 체별로 6베이의 CP-ring 안테나를 예비 안테나로 운용하고 있다. 표 2는 A송신소의 FM 안테나 현황, 그리고 그림 5는 FM 안테나의 설치 도면을 나타낸 것이다. 반면에 이동 측정을 이용하면 측정 대상 송신소를 중심 으로 일정 거리를 원형으로 차량 이용을 통해 측정하므로 빠른 시간에 안테나 패턴을 파악할 수 있다. 표 1. FM 수신(옴니)안테나 사양 Table. 1. FM receiving(omni) specification ITEM Data values Frequency band FM88~108Mhz, VHF174~240Mhz Gain(dB) 2dB VSWR 30 Connector F Type Impedance(ohm) 75 그림 5. FM 안테나(CP-dipole)설치 도면(관악산) Fig. 5. FM mounting drawing(gwanaksan) 이에 따라, FM 안테나의 방사 패턴 측정은 FM 전계 강도 CP-dipole 안테나와 CP-ring 안테나와의 전계 강도 측정 측정 장비인 FM-MC4를 이용하여 이동 측정을 실시하였다. 에 따른 방사 패턴 비교를 위하여 1R(표 )FM은 CP-dipole 또한, GPS(Global Positioning System)를 이용하여 실시간 안테나를 통해 송출하고, 1FM은 315 방향으로 설치된 측정 경로를 표시하고, 50m 간격으로 측정하도록 설정하여 CP-ring 안테나의 6베이를 통해 송출하는 것으로 하였다. 차량이 정지한 때에 중복 측정을 방지하도록 하였다. 표 1은 그림 6은 A송신소의 1FM 전계 강도 측정을 위한 측정 경 전계 강도 측정을 위한 수신 안테나의 사양이다. 로를 나타낸 것이다. 2. 준 관악산 측정 결과 관 산 FM 방송망의 최적화 대상인 A송신소( 악 )에서는 표 2. FM 안테나 현황(관악산) Table. 2. FM status(gwanaksan) Frequency (MHz) Output 1RFM RFM FM FM 89.1 EFM MBC 95.9 Media Main Stand-by 2D-16P (0:90:180: 270) 그림 6. FM 전계 강도 측정 경로(관악산) Fig. 6. FM field strength measurement route(gwanaksan) FM 전계 강도 측정 결과는 측정 데이터를 엑셀 데이터의
5 8 40 방송공학회논문지 제21권 제3호, 2016년 5월 (JBE Vol. 21, No. 3, May 2016) 든 측정 지점은 방위각 으로 환산하였다. 이 측정 데이터를 엑셀의 차트 기능을 이 용하여 도시한 다음, 측정값에 추세선 기능을 이용하여 각 각의 측정 지점에 대한 전계 분포의 차이를 그림 7에 나타 형태로 변환하여 분석하였으며, 모 내었다. 3. 화악산 측정 결과 군 북면 화악리)에서는 1R(표준)FM, B송신소(경기 가평 육 FM의 3매체가 결합되어 CP-dipole 안테나 음악 FM, 교 를 사용하여 송출하고 있으며, 2RFM이 CP-ring 안테나를 통해 송출되고 있다. 또한 각 매체별로 6베이나 2베이의 CP-ring 안테나를 예비 안테나로 운용하고 있다. 표 2는 B 송신소의 FM 안테나 현황을 나타내고 있다. 표 3. FM 안테나 현황(화악산) Table. 3. FM status(hwaaksan) Media Frequency (MHz) Output 1RFM K 음악 K 교육 K 2R K FM 그림 7. CP-dipole 안테나와 CP-ring 안테나의 전계 강도 비교 Fig. 7. Comparison for field strength of CP-dipole & CP-ring 그림에서 두 안테나에 대한 전계 강도 측정 결과를 비교 해 보면 1FM CP-ring 안테나의 전계 분포(청색)와 1R(표 준)FM CP-dipole 안테나의 전계 분포(적색)에 차이가 있음 을 확인할 수 있다. FM Main Stand-by 2D-8P (0:90:180: 270) 2BAY 준 포의 비교 분석을 위하여 1R(표 )FM을 320 방향의 예비 중심으로 한 측정 경로를 통하여 전계 강도를 측정하였다. 거의 동일하지만, 실제로 A송신소에 대해 전계 강도를 측정한 결과에서는 CP-ring 안테나가 설치된 각도 울 도심 방향)를 중심으로 한 3방향(45, 225, 315 )에서는 CP-dipole 안테나에 비해 우세하였으나, 설치 반대 방향인 135 에서는 CP-dipole 안테나에 비해 열세를 인 315 (서 보였다. 이 결과로부터 CP-ring 안테나는 설치 반대 방향(후면)에 작용하여 안테나의 설치 전면 방향에서는 전계를 강화하는 역할을 하는 반면에 안테나의 후면 방향에서는 전계를 차단하는 역할을 하는 것으로 판단된다. 산 안테나인 CP-ring 6베이로 송출하여 그림 8과 같이 화악 을 테나와 6베이 CP-ring 안테나의 수평 방사 패턴은 무지향 위치한 강철 재질의 철탑 구조물이 반사판으로 2BAY B송신소의 경우에는 송출 안테나의 형태별 전계 강도 분 제조사에서 제공되는 데이터에서는 4방향 CP-dipole 안 성으로써 2BAY 그림 8. FM 전계 강도 측정 경로(화악산) Fig. 8. FM field strength measurement route(hwaaksan)
6 1 : FM CP-Ring (Soocheol Choi et al.: Study and Adaptation of FM CP-Ring Antenna Radiation Pattern Transmission Facility) A 9.. CP-ring 3,. 7 9 CP-ring CP-ring 10 CP-ring [8]. 9. CP-dipole CP-ring ( ) Fig. 9. Comparison for field strength of CP-dipole & CP-ring (Hwaaksan) CP-ring 1R( )FM CP-dipole 3,,,,. A. CP-ring CP-dipole CP-ring 2, 4. CP-ring, 7, 9.,, CP-ring 3 CP-dipole, CP-dipole 10. CP-ring Fig. 10. Horizontal radiation pattern of CP-dipole including reflector, CP-ring,., CP-dipole., 4 CP-dipole 360., 3 CP-dipole CP-ring
7 (JBE Vol. 21, No. 3, May 2016) CP-dipole.. FM CP-dipole CP-ring A ( ) B ( )... CP-dipole CP-ring. 4.,,,.,. (References) 1. CP-dipole., 4 CP-dipole CP-ring. 2. CP-ring CP-dipole, CP-dipole. CP-ring 5 9dB. 3., 3 [1] Korea Radio Promotion Association, Study on low power frequency and the frequency used to improve public sector institutions, 2003 [2] [3] ETSI EN , Electromagnetic compatibility and radio spectrum Matters(ERM) ; Short range devices(srd) ; Radio equipment to be used in the 25MHz to 1000MHz frequency range with power levels ranging up to 500mW ; Part 1 : Technical characteristics and test methods, Apr [4] Hosseini, M. and S. Bashir, Circularly polarized radiation by 22 Hosseini and Bashir a dipole over an innovative artificial ground plane, Loughborough Antennas and Propagation Conference, , Loughborough, UK, Mar [5] Yang, F. and Y. Rahmat-Samii, A low profile single dipole radiating circularly polarized waves, IEEE Trans. Antennas Propagat., Vol. 53, No. 9, , [6] Johnson, R. C. and H. Jasik, Antenna Engineering Handbook, 2nd edition, McGraw-Hill, NY, [7] -FCD-108.pdf [8]
8 1 : FM CP-Ring (Soocheol Choi et al.: Study and Adaptation of FM CP-Ring Antenna Radiation Pattern Transmission Facility) : ( ) : : - ORCID : - : : : : - : - ORCID : - :,,
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