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@Ow@i$: You can design whatever antenna you want, but when you don't know how it is used, the actual design time will be long as you may need to start all over again.
Just an example: you use a large ground plane. Monopoles like large ground planes (as a substitute for the other half normally...
@Ow@i$: I don't have ADS, so I can't support you with ADS software related issues.The RL graph in Volker's posting looks good.
Is the ground plane around the CPW structure present in the actual situation (as the antenna in your posting #4 don't have such large ground plane/ counterpoise)?
KlausST has a good point, besides the torque, you need to know how fast you want to rotate the wheel, as this also determines the required mechanical output power the motor must have.
Just an example:
Steering wheel diameter 0.2 m
required force at 0.2 m radius to make a full turn within...
Besides VSWR, did you (or your client) also look to the average gain and or radiation efficiency? Most of my clients would not accept the values stated in the datasheet.
Other things:
Does your client use the antenna as showed in the datasheet? When you place it close to a conducting...
The low band (800/900) looks like a single resonant design. The high band looks like a two resonator structure, however that may also be caused by radiation from the feed line's braid.
I did a google images search with: dual band GSM antenna design, scroll down and you will find PCB pictures...
The BJT has thermal noise in its bulk resistances only. 1/gm appears as a voltage noise source in the base [ rt(4KTB*0.5*re), re = 1/gm ]. This noise source is in series with the noise generated by Rbb' and Ree' rt(4kTB(Rbb'+Ree')).
A FET has a temperature dependent drain noise current...
Who knows where to get small quantity (100...400 m) of 0.5....0.8 mm CCS wire with 19...40% IACS conductivity? Shipping location will be Europe, Netherlands.
Can you provide us more info:
-Maximum size/volume,
-antenna near metal plane or edge,
-Ground plan available,
-maximum VSWR,
-available materials and production method,
etc.
Be prepared that when the size/volume becomes small (with respect to 0.25 wavelength), you will not get the required...
For mechanical stability I would like to use Copper Clad Steel wire instead of solid copper conductor. I already tried 0.6 mm copper coated MIG welding wire. However the copper coating thickness seems well below 5 um as at 150 MHz a got extremely high resistive loss compared to solid copper...
@ark5230: You have a micrcontroller, ADC, etc. By implementing an AC scheme, you will eliminate lots of hard to assess variables. As you are measuring relative high cell impedance, you can use relative low AC frequency that can be handled by your ADC. You could even switch between two AC...
Maybe OT, but what it the function of the cored inductors and polarized capacitors between T1 and T2? If the components behave as an impedance transformer, open load situation may result in high current in the push-pull stage.
I can imagine the transmission line approach as your structure will also show resonance behavior at higher frequencies, similar to shorted or open transmission lines. Like the LCR series circuit, it is an approximation.
I would just run a sweep around the lowest real impedance (series resonant...
There is no generally accepted definition for broad band or narrow band.
In my opinion when BW/Fcenter ratio << 1, it is narrow band, from a filter or amplifier design point of view. So a 9 kHz BW at 455 kHz is narrow band in my opinion.
A 10..20 MHz amplifier (BW/Fcenter = 0.67) I classify...
If the bias resistor is in a 2.45 GHz LNA, or other amplifier circuit (so not an oscillator), I would select the resistor based on its RF and mechanical specifications as its noise at RF is just thermal noise.
When the resistor is not in the RF-path (for example because of decoupling), RF specs...
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