can we generate a microwave beam. does the beam itself create an electromagnetic field, or the antenna?

Answer 1

Yes we can generate beams of microwaves. In fact, the air force is currently in the test phase of such a thing as a potential non lethal force weapon to dispurse crowds.
Supposedly, this beam is to cause discomfort in people by heating the liquids in their skin and causing "burns". I really don't think it will be put into use as microwaves aren't really the safest things to be shooting at people.
As far as the electormagnetic field goes yes a microwave beam would accually be in the electromagnetic spectrum. Try looking up somthing called a MASER. You may find some good info on the web about it.

Answer 2

The beam *is* an electromagnetic field. You can say that it is generated by the antenna, but is more commonly referred to as being produced. "Generate" is usually reserved for the production of electrical power from some other energy source. It's just semantics. A power plant generates electricity, which powers an antenna, which produces an electromagnetic field in the form of a microwave beam.

Answer 3

You generate them every time you use a microwave oven. The e-m field is generated in a microwave tube, think of this as an antenna. The beam itself is an electromagnetic wave.