Is they is any technique to reduce the HPBW of H-Plane of Slotted waveguide Array Antenna except increasing the number of slots and subarray technique?
If you change the slot shape - perhaps to an H, it may narrow the element pattern by making the field along the radiating part more even, but if the array has more than 2 or 3 elements this will not narrow the H-plane pattern. The width of the beam is determined almost completely by the width of the array.
Malcolm White , i want to design of SWA consist of 10 slots, the issue is that the HPBW of E-Plane can be controlled by introducing grooves or any other technique but for H-Plane it only reduces when number of slot increases, is there any other way?
I already said you could use H-shaped slots, or some other shape that reduces the element beamwidth.
If you have more than 2 elements the element beamwidth should hardly affect the beamwidth, as it will all be in the array size.
Are your elements too far apart so that you have grating lobes?
I want to design such array antenna which should have 5*5 degree HPBW in E and H plane, the E-Plane HPBW can be controlled by increasing the SWA elements in linear configuration of Array but for H-Plane i want to decrease the HPBW without increasing the number of slots, but you are saying that H shape slot will not work for large number of slots?
elements are not place very far , grating lobes is not issue Malcolm White
The beamwidth is inversely proportional to the width of the radiator.
The beamshape of an array is the product of two beamshapes :- the beamshape from infinestmal souces at the centres of the all elements, which is the array beamshape :- the other beamshape is the shape due to the element size and shape. The elment beamshape will always be narrower than the array shape.
The only possible exception to this is superdirectivity, which can give very narrow beams from narrow apertures. However, superdirectivity is very difficult to achieve and is nearly always not worth looking for as a solution. It also wastes a lot of power, because although the directivity is higher, the gain is lower than it would have been. I don't know if it would ever be possible to get superdirectivity from waveguide slots.
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