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ahmed osama,
Isn't the the antenna you're refering to the external 900/1800 MHz GSM antenna used by car kits (hands free)? For those frequencies, it is not particularly short. Typically, I think the FM radio antenna is integrated in the rear window (combined with de-frost functionality)...
tender_006 wrote:
"can some explain me why do we need ground plane for the antennas , plz tell how does its effects in the case of mobile terminal antennas?"
In the case of mobile terminal antennas, most antennas used in e.g. mobile phones utilizes the terminal chassis as a part of the...
abhi_kolkata,
I have to disagree with costox. Without going into much details, I would suggest either IE3D (if the dielectrics are not too complicated) or CST microwave studio. CST is a time-domain solver, so you will get the entire bandwidth from one simulation run. On the other hand, CST...
Re: Matching .... ?
I guess that if you use a discrete VCO component, it should have some buffer amplifer (with low S12) already integrated with the VCO to make it (more) insensitive to different load impedances. This buffer should have a 50 Ohm output interface. I've mainly worked with on-chip...
ahmad_abdulghany,
Is your design broad-band or narrow-band? Do you use resistive or inductive collector/drain loading? Is it an LNA or PA or buffer?
I guess there is no good general answer to your question "What is the optimum coupling method between two transistor stages at 100MHz?". It will...
geppei,
Yep, as they are both monopoles with similar shapes, both will have the same radiation properties. In theory the only real difference will be in terms of impedance bandwidth. In practice, you will also get some extra losses in the matching network of antenna B. For this particular case...
agilent ads software + coaxial probe feed
Maybe it is possible to include a coaxial connector/cable in the new version of ADS (Momentum), which has extended 3D capability. For older versions I guess it is possible, but it will probably be quite difficult to draw the structure.
Anyway, I don't...
radiation+efficiency+of+small+antennas
Pushhead wrote:
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"If my CST simulation is accurate (which i'm sure is not) than all you have to do is connect a matcing network to my λ/20 dipoe, and it will radiate exactly like a λ/2 dipole.... "
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Yes, you are...
how to calculate radiation efficiency with cst
Hi Pushhead,
I guess it could be reasonable if the antenna is thick enough and the metal is sufficiently conductive. Of course, if/when you try to match the antenna to any real impedance (like 50 Ohms), the matching components will introduce a lot...
arebee,
If you want maximum voltage swing at the input (or, equivalently, maximum input power) you have to conjugate match the input.
If Rin>>Rs, then the maximum voltage swing at the input of the amplifier is Vs. BUT, if you conjugate match the input, the voltage swing will be MUCH HIGHER...
arebee,
Conjugate matching the amplifier input will give you the largest voltage swing at the input, and therefore the largest input power. If you have a large input impedance, the maximum voltage swing you will get is equal to the sourve voltage (if the source resistance is low). However, if...
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