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Investigation and design of a slotted waveguide antenna with low 3D sidelobesMaritz, Andries Johannes Nicolaas 03 1900 (has links)
Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: An investigation into the cause of undesired sidelobes in the 3D radiation
pattern of slotted waveguide arrays is conducted. It is hypothesized that
the cross-polarization of the antenna is at fault, along with the possibility
that an error is made when designing a linear array. In investigating and
finding a solution to the problem, the “Z-slot ” is introduced in conjunction
with polarizer plates. The base components are used by a custom optimization
algorithm to design reference and solution antennas. Results of the
antennas are then compared to ascertain the cause and possible solutions
for the unwanted sidelobes. The generic nature of the process may be used
to characterize other arbitrary aperture configurations and to design larger
antennas. / AFRIKAANSE OPSOMMING: ‘n Ondersoek om die oorsaak van ongewensde sylobbe in die 3D uitstraalpatroon
van golfleier-antennas vas te stel. Die hipotese is dat die probleem
ontstaan uit die kruis-polarisasie van die antenna, tesame met ‘n verkeerdelikke
aanname dat die opstelling liniêr is. Die “Z-Gleuf” tesame met polariseringsplate
word voorgestel as hulpmiddel om die moontlikke oorsake
te ondersoek. ‘n Gespesialiseerde optime erings-algoritme benut hierdie basiskomponente
om beide verwysings- en oplossing-antennas te ontwerp.
Resultate van die ontwerpde antennas word dan vergelyk om die oorsaak
van die ongewensde sylobbe te vas te stel. Die generiese aard van die proses
kan toegepas word op enige gleuf-konfigurasie en om groter antennas mee
te ontwerp.
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Design Of A Slotted Waveguide Array Antenna And Its Feed SystemTop, Can Baris 01 September 2006 (has links) (PDF)
Slotted waveguide array (SWGA) antennas find application in systems which
require planarity, low profile, high power handling capabilities such as radars. In
this thesis, a planar, low sidelobe, phased array antenna, capable of electronically
beam scanning in E-plane is designed, manufactured and measured. In the design,
slot characterization is done with HFSS and by measurements, and mutual coupling
between slots are calculated analytically. A MATLAB code is developed for the
synthesis of the SWGA antenna. Grating lobe problem in the scanning array, which
is caused by the slot positions, is solved using baffles on the array.
A high power feeding section for the planar array, having an amplitude tapering to
get low sidelobes is also designed using a corrugated E-plane sectoral horn. The
power divider is designed analytically, and simulated and optimized with HFSS.
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Dual Polarized Slotted Waveguide Array AntennaDogan, Doganay 01 February 2011 (has links) (PDF)
An X band dual polarized slotted waveguide antenna array is designed with very high polarization purity for both horizontal and vertical polarizations. Horizontally polarized radiators are designed using a novel non-inclined edge wall slots whereas the vertically polarized slots are implemented using broad wall slots opened on baffled single ridge rectangular waveguides. Electromagnetic model based on an infinite array unit cell approach is introduced to characterize the slots used in the array. 20 by 10 element planar array of these slots is manufactured and radiation fields are measured. The measurement results of this array are in very good accordance with the simulation results. The dual polarized antenna possesses a low sidelobe level of -35 dB and is able to scan a sector of ± / 35 degrees in elevation. It also has a usable bandwidth of 600 MHz.
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