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You can use fractal planar antennas. But the problem is may be the whole antenna size that can be a little bit big regarding the fact that handset are getting smaller nowadays.
any designer can define his owner bandwidth: so you can consider the frequency ranger over wich the gain is within 3db, or any ather parameter within 3dB.
For commun use, we think about the band in wich the SWR is les than 2.
There is no specific rule but:
if the antenna is uppon a ground, so you can imagine a half space radiation
If the antenna is a wire one, you can imagine the maximum radiation in the plane containing the feed point
you must be used with two main types of antennas: wire (dipole, monopole, IFA)...
normally you should not notice a big difference.
However this depend of the operating frequency. So may be for high frequencies there is some skin effect.
On the other hand, the thikness can modify the capacitive effect and hence modify a little bit the impedance.
Any lumped practical (not theoretical) element is made of a resistor, a capacitive effect and an inductive one.
A spiral is an inductive tanker coupled to capcitive effecte (because of lines proximity) and a resistor (for electric losses). Syou spiral wil be represented by a self coupled to a...
I think it's better to use a vertical feed in case of finite ground. The feeder will be defined inside the dielectric at the excitation point. The top of the vertical port will be connected to the radiating plate, the bottom will be connected to the finite ground.
Microstrip antenna
For a full efficient patch antenna, consider 1/2 wavelenght. You can make it shorter by adding an irregularity inside the dielectric: for example a short (electric wall) between the the radiating element and the ground.
capacitance s11
Hi
just use some formulas that relate the the Sij parameters to the measured or simulated line structure:
- ch(g.l)=((1+S11)*(1-S22)+(S12*S21))/(S12+S21)
- Zc=
Zr*sqrt(((1+S11)*(1+S22)-(S12*S21))/((1-S11)*(1-S22)-(S12*S21)))
- R = Real(g*Zc)
- L = (Imag(g*Zc))/w
- C =...
Re: MoM efficiency problems
Oh! sorry, I apologize, it's Momentum Agilent and not Ansoft like mentioned.
However, it seems that MoM algo implemented with IE3D and Momentum do not take into account the radiated power coming by the edges of the structure. You must know that both these two EM...
Re: MoM efficiency problems
I still don't have any answer for this issue. Do you think that MoM algo neglict part of the radiation eff when we change the permittivity?
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