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Beam‐squint minimization in series‐slotted waveguide array antennas using double negative materials
Author(s) -
Oh SoonSoo,
Shafai Lotfollah
Publication year - 2006
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.21800
Subject(s) - series (stratigraphy) , optics , microwave , beam (structure) , waveguide , antenna (radio) , wavelength , materials science , slotted waveguide , tilt (camera) , antenna array , physics , directional antenna , slot antenna , engineering , electrical engineering , mathematics , geometry , quantum mechanics , biology , paleontology
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 0.5 ° and 0.8 dB, respectively, within a 10% frequency band. In the corresponding conventional array these parameters were 5 ° beam tilt and 3.3 dB boresight gain loss. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1789–1792, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21800