0
0
이전
다음
위로
  공지 사항
  FAQ
  입금,배송,A/S 문의
  제품문의
  기술문의
  제조사별 A/S 센타
  드라이버 자료실
  광통신 자료실
  메뉴얼 자료실
  무선 자료실
  네트워크 자료실
  시리얼통신 자료실
  여행, 호텔용품 자료실
  프로그램 자료실
  각종 규격,인증자료실
  최신 정보| 기사들
  모바일 관련제품 자료실
  EXA OPTICS 카다록, 데이타시트
[EXA] 10GBase-T Copper SFP+ 30m 광모듈- RJ45
400,000원
EXA-61P POF 프라스틱 광케이블 측정키트 -윈도,usb,시리얼 지원
4,840,000원
SH4002 플라스틱 광패치코드( POF)-코어 1.0mm
5,000원
MS-5AMP1000B-OUTDOOR 5GHz 아웃도어용 손실방지기 1W
950,000원
EXA SFP포트용 Dust Cover
3,000원
   현재위치 : HOME > 커뮤니티 > 무선 자료실 
무선 자료실
  Corner reflector antenna (코너 리플렉터 안테나)
  2015-05-11 19:02:50   2811
  무선랜쇼핑몰

Corner reflector antenna

A corner reflector antenna is a type of directional antenna used at VHF and UHF frequencies.[1][2] It was invented by John D. Kraus in 1938.[3][4] It consists of a dipole driven element mounted in front of two flat rectangular reflecting screens joined at an angle, usually 90°.[1] Corner reflectors have moderate gain of 10-15 dB,[2] high front-to-back ratio of 20-30 dB, and wide bandwidth. They are widely used for UHF television receiving antennas, point-to-point communication links and data links for wireless WANs, and amateur radio antennas on the 144, 420, and 1296 MHz bands.[2] They radiate linearly polarized radio waves and can be mounted for either horizontal or vertical polarization.

The flat reflecting surfaces can be metal sheets, but are more often made of wire screen or rod elements parallel to the driven element, to reduce weight and wind loads on the antenna.[2] The angle θ between the sides is most commonly 90°.[1] The gain increases as the angle narrows, but the increase below 90° is minimal, and requires longer reflector screens be used. However, angles down to 45° have been used.[2]

The spacing (S) of the driven element in front of the point where the reflectors meet is approximately 0.5λ but is not very critical; for 90° antennas the gain doesn't vary more than 1.5 dB for S between 0.25λ and 0.75λ.[2][1] The radiation resistance of the dipole increases with this spacing, so the spacing can be adjusted to match the driven element to the feed line.[2] Bowtie driven elements are often used for wide bandwidth applications like television antennas.[1]


 

 

 

 

 

 

 

 

 

The antenna can be regarded as a plane reflective array antenna in which the reflecting plane has been bent at an angle reduce the beamwidth, as such it has a gain intermediate between that type of antenna and a parabolic antenna.

Variations

  • The single driven element can be replaced by a Yagi array. UHF Yagi television antennas very often use a corner reflector. These antennas actually function more like two separate antennas: the corner reflector and driven element serves to provide broad bandwidth gain at the lower end of the UHF band, while the Yagi array is cut to give extra gain at the high end of the band.
  • Monopole versions for use at lower frequencies have been built by placing vertical reflecting screens behind a vertical monopole antenna

 

450 MHz homemade corner reflector.
 
Corner reflector UHF TV antenna from 1954 with bowtie dipole driven element

 

 

 

 

 

 

 

 

*안테나 상세문의:  무선랜통신(주)  02-716-3799

www.wirelessall.co.kr

 


 민간 항공용 교통관제 주파수표
 안테나 타입(Antenna Type)