Communications: radio wave antennas – Antennas – Wave guide type
Patent
1998-09-02
2000-10-10
Wong, Don
Communications: radio wave antennas
Antennas
Wave guide type
343772, 343775, 343840, H01Q 1302
Patent
active
061306495
ABSTRACT:
A polarizer for exciting the parabolic reflector of a directional antenna includes a profile section (7) which is formed as a waveguide and is adapted to simultaneously transmit two linearly polarized orthogonal electromagnetic waves. Two rectangular waveguides which separately guide the two electromagnetic waves are connected to the profile section (7). The end face of one of the rectangular waveguides is connected to the side wall of the profile section (7) in a radial direction, whereas the other rectangular waveguide is connected to an end face of the profile section (7). Both rectangular waveguides have an electromagnetic connection to the profile section (7) via openings, wherein a short-circuiting element (10) is disposed in the profile section (7) between the openings. Separate tuning elements are made unnecessary by locating a first transition section which is formed as a cavity (11) and has a generally rectangular cross-section, between the radially connected rectangular waveguide and the respective opening (9). Two opposing mutually aligned ribs (12, 13) which extend along the axial direction and project from the wider walls of the cavity (11) are arranged in the first transition section. In addition, a second transition section (8), which is stepped and encloses a cavity with a generally rectangular cross-section, is located between the profile section (7) and the rectangular waveguide (4). The second transition section (8) is connected to the end face of the profile section (7), wherein the end face of the rectangular waveguide is connected to the second transition section (8).
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Anton Boifot, "Classification of Ortho-Mode Transducers," in European Transactions on Telecommunications & Related Technologies, Ass'n Elettrotecnica ed Elettronica Italia, Milan, Italy, vol. 2, No. 5, pp. 503-510, Sep.-Oct. 1991 (ISSN 1120-3862).
Quade Hans-Peter
Reimann Karl-Heinz
Wojtkowiak Daniel
Alcatel
Chen Shih-Chao
Wong Don
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