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Where does it go? (mismatched power)
On Jun 11, 10:45*am, K1TTT wrote:
On Jun 9, 10:38*pm, Jim Lux wrote: In fact, the ration between that stored energy and the amount flowing "through" (i.e. radiated away) is related to the directivity of the antenna: high directivity antennas have high stored energy (large magnetic and electric fields): *the ratio of stored to radiated energy is "antenna Q" (analogous to the stored energy in a LC circuit leading to resonant rise). So, high directivity = high stored energy = high circulating energy = high I2R losses. this is a relationship i haven't heard of before... and would be very wary of stating so simply. *it may be true for a specific type of antenna, MAYBE Yagi's, MAYBE rhombics or or close coupled wire arrays, but some of the most directive antennas are parabolic dishes which i would expect to have very low Q and extremely low losses. *you could also have an antenna with very high Q, very high i^2r losses, but very low directivity, so i would be careful about drawing a direct link between the two. and yes, this does work for complex loads and multiple stubs and connections to the line. this is a reasonable description of the derivation of these techniques, study especially the Thevenin equivalent impedance representation on page 2-13 and how it is applied: http://ee.sharif.edu/~comcir/readings/tran%20line.pdf |
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