2007-09-17 18:44:54 · 4 answers · asked by JAMES 4 in Science & Mathematics ➔ Engineering
It depends on a great many factors: operating frequency, half-wave or quarter-wave antenna, the size of transmission cable and antenna impedance matching, how high the antenna is above ground and/or physical structures, the type of material that makes up the antenna itself, and finally, the type of antenna.
Given that, the highest operating gain that I have seen on any commercial antenna is about 11 db gain on a 5-element beam antenna for CB. Of course, one could "stack" these antennas for maybe 14 or 15 db gain.
2007-09-17 19:04:26 · answer #1 · answered by Bob D1 7 · 0⤊ 0⤋
a antenna is a passive waveguide with other ends flaired up so it cannot amplify for example a rf or microwave signal applied at its input so a highly directional antenna can radiate all input energy in single direction making maximum attainable gain as one(1) theoritically also gain cannot be more than one and its a function of type of antenna,how its fed etc..
2007-09-17 19:21:12 · answer #2 · answered by ganesh b 1 · 0⤊ 0⤋
At microwave frequencies it's no big deal to get 30 to 40 db out of a well designed parabolic reflector.
Doug
2007-09-17 19:47:16 · answer #3 · answered by doug_donaghue 7 · 0⤊ 0⤋
How about 30dBi for a dish antenna for 2.4GHz?
2007-09-17 19:11:18 · answer #4 · answered by Robert T 4 · 1⤊ 0⤋