The design of small slot arrays
Abstract
A theory is proposed for evaluating the array behavior of longitudinal shunt slots in terms of the characteristics of complementary dipoles. The theory employs a modified form of Booker's relation based on Babinet's principle to treat nonresonant longitudinal shunt slots in the broad wall of a rectangular waveguide. Formulas are derived for active, self-, and mutual admittances of longitudinal slots. It is shown that slot arrays can be designed by choosing the lengths and offsets of individual slots such that one of the design equations presented yields a slot voltage distribution consistent with the desired pattern, and such that a second design equation yields an active admittance distribution consistent with the feed and match requirements of the array. The theory is subjected to experimental testing in a variety of situations involving a single slot, a pair of slots, and a small two-dimensional array, yielding quite satisfactory agreement.
- Publication:
-
IEEE Transactions on Antennas and Propagation
- Pub Date:
- March 1978
- DOI:
- 10.1109/TAP.1978.1141814
- Bibcode:
- 1978ITAP...26..214E
- Keywords:
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- Antenna Arrays;
- Antenna Design;
- Slot Antennas;
- Waveguide Antennas;
- Microwave Resonance;
- Rectangular Waveguides;
- Communications and Radar