biquad/dish combination
I don't see any problem with a feed pointing at only a part of a dish. The reflection of the dish still will go to the point where the disk is aiming to and no energy is wasted in a wrong direction. Correct me if a am wrong about that.
One other thing I like to know is the influence of a reflector on a feed mounted on a dish. As said the reflector in some examples are still 110 mm square. While a the focus of a dish should be a about 1 mm^2. Does this mean a biquad with such a large reflector has to be mounted off focus? I really don't know anything about antenna's but I do know a little about reflection. So I expect since the biquad is much larger is size then a single point, it should be mounted off focus. Maybe a fair distance towards the dish or a little distance away from the dish. Hopefully this drawing makes clear what I mean. For the ease of the drawing the dish is pointed downwards.
I S D H \ / \ / \ / \ / \ / \ /========\ / === biquad ____\/__________\/___ ___ reflector towards dish \ / \ / \ / \ / \ / ______\/__________ FOCUS /\ \========/ __\/____\/_____ reflector away from dish
Remember I don't know nothing about antenna's :-)
read more and respond »Posted 5 years ago by Edmund in Wireless Networking
