Title:
【発明の名称】マイクロ波バラントランス
Document Type and Number:
Japanese Patent JP2668131
Kind Code:
B2
Abstract:
PCT No. PCT/GB88/00077 Sec. 371 Date Oct. 24, 1988 Sec. 102(e) Date Oct. 24, 1988 PCT Filed Feb. 10, 1988 PCT Pub. No. WO86/06343 PCT Pub. Date Aug. 25, 1988.A microwave balun transformer provides an extension of operating frequency range particularly in conjunction with a cavity-backed spiral antenna (5). The balun cavity (13) has a dipole (15,17) extending between an unbalanced coax port (19) and an opposite end wall (29), the dipole junction (16) being connected to a balanced twin line (7). The length of the cavity is effectively controlled to make it closer to (two) quarter-wave stubs by inserting a frequency dependent reflector (21) at each end of the dipole. At low frequencies the reflectors are transparent thus giving the full length of the cavity, while at high frequencies the reflectors reflect and effectively shorten the cavity.
Inventors:
Morgan, Thomas Eugene
Application Number:
JP50149188A
Publication Date:
October 27, 1997
Filing Date:
February 10, 1988
Export Citation:
Assignee:
The Marcouni Company Limited
International Classes:
H01F19/06; H01F17/04; H01P5/02; H01P5/10; H01Q11/08; (IPC1-7): H01P5/10
Domestic Patent References:
| JP52162831U |
Other References:
ＩＥＥ Ｐｒｏｃ．Ｖｏｌ．１３２，Ｐｔ．Ｆ，Ｎｏ．４，１９８５，ＰＰ．２４５−２５１
ＩＥＥＥ ＡＰ−Ｓ Ｉｎｔ．Ｓｙｍｐ．１９８６，ＰＰ．７７７−７８０
ＩＥＥＥ ＡＰ−Ｓ Ｉｎｔ．Ｓｙｍｐ．１９８６，ＰＰ．７７７−７８０
Attorney, Agent or Firm:
Nobuyuki Iida