I calculate gain in 4-20 GHz of broadband antenna but in 12GHz gain decreased ( gain drop ) i don't know the reasons
Could any one help me to give reasons ??????
Various parameters control the gain of the antenna. They are:
1. Antenna's matching profile which is a function of frequency. Under unmatched frequencies, the gain will drop significantly.
2. The creation of standing waves at a certain frequency.
3. The point of measurement of radiation intensity w.r.t elevation and azimuth angle.
4. The radiation resistance of the antenna is a function of frequency.
5. Co and cross-polarization as a function of frequency has got a huge impact on the gain of the antenna.
6. Directivity and HPBW control gain.
check the impedance matching of your design around 12GHz (look at S11 parameter). which gain are you looking for (total gain, realized gain...)?. it is important to check those parameters.
check the mechcells used or substrate`s type, i guess are the most reasons for decreasing the gain
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