DTIC AD0769907: A Single Feed, High Gain pdf

DTIC AD0769907: A Single Feed, High Gain

More Book Details

Description of the Book:

unicationsCircular polarizationThe development of a single-feed, high-gain, circularly polarized ‘cup-dipole’ antenna, operated over the frequency band of 2.24-2.25 GHz, and its test coupler is described. The antenna consists of a turnstile feed of crossed dipoles of unequal lengths, backed by a cup cavity. With a cup size of 1.33 wavelength in diameter, it produces a gain of 12.7 dB when matched to a VSWR of 1.1. This corresponds to an effective receiving area 6% larger than the physical area. An even higher gain of 13.4 DB, or an aperture efficiency of 122.5%, is observed when the antenna is flush- mounted on a large plate. The radiation pattern shows that the antenna has a half-power breamwidth of approximately 40 degrees and an axial ratio of or = 0.5 dB over the angular region of plus or minus 10 degrees off boresight

• Creator/s: Defense Technical Information Center
• Date: 7/5/1973
• Year: 1973
• Book Topics/Themes: DTIC Archive, Lang, Kuo-Chun, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *SATELLITE ANTENNAS, TEST EQUIPMENT, SATELLITE COMMUNICATIONS, RADIO LINKS, S BAND, CIRCULAR, COUPLERS, POLARIZATION, ANTENNA RADIATION PATTERNS

An excerpt captured from the PDF book