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gain and efficiency of antennas

Question asked by DUSSOPT on Mar 31, 2003
Latest reply on Mar 31, 2003 by ALEPEREZ
I have a problem with the gain and efficiency of an antenna calculated by Momentum.
First, I simulate a microstrip dipole on a substrate fed by differential ports. The directivity is 2.65 dB, the gain is 1.42 dB and therefore the efficiency is 75% (some losses occur because of surface wave modes in the substrate).

Now, I simulate a similar dipole, but slightly assymetric. The impedance is almost identical since the dipoles are similar, but the efficiency is now exactly 100%, with the directivity and gain equal to 2.35 dB!

anybody can help?