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Beam‐squint minimization in series‐slotted waveguide array antennas using double negative materials
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- Authors
- Soon Soo Oh, Lotfollah Shafai
- Issue Date
- 2006-09
- Citation
- Microwave and Optical Technology Letters, v.48, no.9, pp.1789-1792
- ISSN
- 0895-2477
- Publisher
- John Wiley & Sons
- Language
- English
- Type
- Journal Article
- Abstract
- A 5 × 1 series-slotted waveguide array antenna partly filled with double positive (DPS) and double negative (DNG) materials is investigated. The DNG material has a negative wave vector and its guided-wavelength equals that of the DPS material. Two simple straight slotted waveguides, one filled only with the DPS material and the other with both DPS and DNG materials, are designed and studied. It is found that the latter waveguide has repeated voltage standing wave shapes. This unique characteristic is utilized to minimize the beam squinting effect in the series-fed array antennas. It is shown that in a 5 × 1 array using both DPS and DNG materials, the variation in the direction of its beam and boresight gain are limited to 0.5째 and 0.8 dB, respectively, within a 10% frequency band. In the corresponding conventional array these parameters were 5째 beam tilt and 3.3 dB boresight gain loss. © 2006 Wiley Periodicals, Inc.
- KSP Keywords
- Double negative(DNG), Double negative materials, Negative wave, Series-fed array, Slotted waveguide array antenna, Standing Wave, Wave shapes, beam tilt, frequency band