peshalnayak
Antenna-Theory.com Newbie
Joined: 09 Dec 2012
Posts: 8
|
 Posted: Sun Oct 06, 2013 10:44 am Post subject: Higher resonant frequencies of a rectangular patch antenna |
 |
|
In case of a rectangular patch which is supposed to operate at single frequency, why does the return loss plot show resonance at higher frequencies. Are these related to the fundamental frequency?
Why can we not use these frequencies for operation and claim that the rectangular patch has a multiband performance instead of single band.
If the return loss plot shows multiple frequencies for some other patch shape, how can we conclude that these are not higher order harmonics? Is there any way to test or theoretically verify that they are not higher order harmonics? |
|
Schubert
Antenna Wizard
Joined: 08 Apr 2009
Posts: 161
|
| Posted: Sun Oct 06, 2013 6:46 pm Post subject: |
|
|
The antenna will radiate wherever the currents or voltages are adding in phase and not canceled out. What would force the antenna to only radiate at a single frequency? nothing. Typically these modes are related to the fundamental frequency (often 3x, 5x, etc, but can be 2x, 4x,....)
You can make a single dipole antenna, and then claim you made a 100 band antenna that operates at f0, 3f0, 5f0,.....
However antenna design is never "make an antenna that radiates at arbitrary frequencies". It is "make an antenna that radiates at 700-960MHz, and 1710-2170MHz....." You must have an application in mind before you design your antenna, otherwise you are wasting your time. |
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
