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cavity backed antenna

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akedar

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can any body tell me how to design wide beamwidth (>120 deg) wide bandwidth (>1 GHz) in X-band with low cross-polarization cavity backed antenna asap
its urgent guys

ashutosh.kedar@gmail.com
 

edf

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I once used a cavity backed slot (3/8 wavelength gnd spacing) that obtained an 88 deg beamwith and 10% bandwidth at 9GHz.
 

akedar

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problem i am facing is of high cross-polarization can u suggest something
 

edf

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You can start with these dimensions and experiment from there:

material: 0.254mm brass

slot dimensions: 16mm x0.8mm

feed tap from end of slot: approx 3mm

gnd spacing: approx 8.5mm

cavity extends approx 1/4 wavelength parallel to slot
 

akedar

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Thanks for replying
I dont want slot antenna i want patch antenna supported by a cavity

can u send me something on that or some good papers u have:D
 

demian1977

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If you are using a patch, why do you need a cavity? are there absorbing material in the cavity to reduce the bask scatter? If it's possible you can use a radom that polarize the radiated field or resonant dipole.
 

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