![]() ![]() The diameter of the dish in centimeters is 53 cm, so the beamwidth about 3 degrees.įor grins we chrome plated this dish and used it as a giant magnifying glass to focus the sun. The slang term for parabolic reflector is a dish. Let's apply that rule to a the Dish 500 reflector shown below:įrom our "what's the frequency" page we know that the frequency of the Dish Network is around 12.5 GHz. A parabolic reflector is used in many antenna systems to focus energy down to a smaller spot size. Robert Collin wrote some outstanding textbooks back in the 1950s and 1960s. Click here to go to our page on recommended books on all microwave engineering topics. Collin, in his book, Foundations for Microwave Engineering. Parabolic Antenna, Cassegrain Reflector, Offset Reflector, Terahertz Band, Antenna Design. Thanks for the correction, Vincenzo! This rule is attributed to Robert E. software programs (including HFSS, Wave Wizard and GRASP). ![]() Rule of thumb: the angular half-power beam width (HPBW) of a parabolic reflector can be estimated from the diameter of the dish and the frequency of operation:Īngular beam width (degrees)=70 degrees/(D/lambda) Time for another Microwaves101 Rule of Thumb! The slang term for parabolic reflector is a "dish". ![]() Click here to go to our main page on antenna designĪ parabolic reflector is used in many antenna systems to focus energy down to a smaller spot size. ![]()
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