Communications: radio wave antennas – Antennas – Slot type
Patent
1994-09-16
1996-07-30
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Slot type
343770, 333237, H01Q 1310
Patent
active
055416128
ABSTRACT:
A waveguide antenna (1) has an upper (2) and air (3) cavity waveguide, these waveguides being separated by a partition wall (4). Transversely extending slots (7) are disposed along the center line of the upper waveguide (2) with a mutual spacing of one wavelength-distance (.lambda..sub.g). Two slots (6) which extend in the direction of the longitudinal axis of the waveguide are disposed between the transversal slots (7). The partition wall (4) is provided with longitudinally extending slots (8) immediately beneath the longitudinally extending slots (6), and field-shifting posts (9) are placed in the lower waveguide (3) adjacent the latter slots (8) in a zig-zag pattern along the waveguide (3). Baffles (10) counteract grating lobes. A fundamental mode of an electromagnetic field (E1) in the upper waveguide (2) excites only the transversal slots (7), which radiate a field (E3). The same fundamental mode (E2) in the lower waveguide (3) excites the slots (8) in the partition wall. These latter slots radiate a field (E4) which excites only the upper longitudinally extending slots (6), which radiate a field (E5). Supply of the fundamental modes (E1, E2) and also the radiated fields (E3, E5) are independent of one another and a desired polarization can be obtained. A radiated lobe is symmetric and the radiated fields (E3, E5) can carry individual information.
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A. J. Sangster, entitled "Polarisation Diversity Techniques for Slotted-Waveguide Array Antennas", and appearing in Mikrowellen & HF Magazin, vol. 15, No. 3, 1989, pp. 237-243.
Hajec Donald T.
Telefonaktiebolaget LM Ericsson
Wigmore Steven
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