Title:
【発明の名称】二重モードログ周期ダイポールアンテナ
Document Type and Number:
Japanese Patent JP2564410
Kind Code:
B2
Abstract:
A dual mode log periodic dipole antenna (20) provides for sum and difference radiation patterns depending on the method of excitation. The antenna incorporates a support structure (22a, 22b) which secures a plurality of radiators (24) having three elements with successively increasing length. The center and right dipole elements of each radiator (24) and the center and left elements of each radiator (24) are alternately coupled together by separate conductive elements (32) in a crisscross fashion. Input ports (28, 30) coupled to the smallest radiator (24a) are driven with conventional hybrid coupler with either in-phase or out-of-phase energy at either lambda /2 or lambda . Sum and difference radiation patterns are achieved by appropriate section of the excited phase. Thus, this antenna (20) may be employed in monopulse or direction finding applications.
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Inventors:
EDEYUAADO EICHI BIRASEKA
MAAKU ERU UIIRAA
DONARUDO JII KEPURAA
MAAKU ERU UIIRAA
DONARUDO JII KEPURAA
Application Number:
JP32277889A
Publication Date:
December 18, 1996
Filing Date:
December 14, 1989
Export Citation:
Assignee:
HUGHES AIRCRAFT CO
International Classes:
H01Q9/16; H01Q11/10; H01Q25/02; (IPC1-7): H01Q25/02; H01Q11/10
Attorney, Agent or Firm:
Takehiko Suzue (3 outside)