Can Antenna Pattern be modified without taking the Antenna apart?
Can Antenna Pattern be modified without taking the Antenna apart?
(OP)
The antenna in question is dual polarized directional Panel, operates at 5GHz ISM band.
Horizontal beamwidth 60 degrees.
How to modify the pattern to make beamwidth ~120 deg (both polarizations) without disturbing radiating structure (structure is corporate-fed unidirectional patch array)?
Is there systemized, methodical way to design such modification?
Thank you,
Andrey
Horizontal beamwidth 60 degrees.
How to modify the pattern to make beamwidth ~120 deg (both polarizations) without disturbing radiating structure (structure is corporate-fed unidirectional patch array)?
Is there systemized, methodical way to design such modification?
Thank you,
Andrey
RE: Can Antenna Pattern be modified without taking the Antenna apart?
RE: Can Antenna Pattern be modified without taking the Antenna apart?
Blockage or shaped lens will work.
I've used a Donut, dome or shaped dielectric in front of antennas to widen beamwidths.
If you have alot of S/N ratio, cover up three of the elements with absorber (sounds like your antenna is a four element patch antenna) and only one will be used. That'll widen the beamwidth, but drop your gain 6 dB plus gain change.
Other options for blockage is a disk(metal or dielectric) in front of the antenna. Blocked boresight radiation (or phase delayed lens) is equal to widened beamwidth.
If you have Ansoft HFSS or CST, you could model it and build confidence, though proof is in the build of it.
RE: Can Antenna Pattern be modified without taking the Antenna apart?
Interesting idea even though I afraid it will be losses.
Meanwhile I experimented using conductive scatterers.
I simulated single patch (the antenna is 16 patches) and found out that i can adjust effectively pattern of one polarization but not another. Specifically, B-plane of the pattern can be adjusted and E-plane - not
Also, match goes off
(I am limited by ~ 1 wave length how far I can place the scatterer0
Interesting point about dielectrics
RE: Can Antenna Pattern be modified without taking the Antenna apart?
Seems you should buy/design a single patch antenna, it'll be easier and less expensive. Or are you forced to use this antenna by management who made a purchase error and don't want to admit it?
120 degree beamwidth antennas are very difficult to create with Smooth patterns if you have any structures near them, since RF Energy will bounce off them.
Good luck.