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This sounds suspicious, your patch is in resonance at 0.6 GHz? Is your patch somehow electrically shorted? What substrate do you use? I think it would be helpful to show us your structure (with dimensions).
Generally, there is a limit on your efficiency (gain) and as biff44 wrote, you would need...
Hi,
I think that in CST, you are generating Gerber data from the motive laying in xy plane (z=0). You can alternatively use a local coordinate system and align the uv plane, so that it "cuts" your motive parallel to the xy plane.
I had a quick look at the article and I think it is not a typical patch antenna. The water "patch" serves as a reflecting layer (due to high dielectric contrast between air and water) for the waves emanating from the feeding probe. So the probe is not generating conductive currents on the patch...
keith is right about everything, but let me try to explain it from little physical point of view:
- wikipedia is right, but you have to read carefully. That definition is saying about work in STATIC electric field, whereas in case of a parallel circuit we have current field. That are two...
Hi,
at first, your patch element has to be square. Since the patch is trimmed at two corners and the trimming is symetrical, you will need only one parameter to model it efficiently. Then you should perform a parametric study, where you will change the trimming size and observe axial ratio in...
Hello,
bandwidth in a hollow waveguide is limited by the cutoff frequency of the first higher mode. If you exceed this frequency you are having at least two modes that are superimposed and thus deteriorates your signal. With increasing frequency, more and more modes are allowed to propagate....
Thanks for your posts.
I think I understand it now based on the resonance in the secondary circuit.
But what if we want to analyze and explain it via impedance transformation. Is it possible?
If I calculate the reactance only of the dominant 1m capacitor at 300 Hz, it is 0.53 ohm.
After...
Thank you both for answering.
Is this really true? in series resonance, the current should be maximum because the reactance parts of the impedance cancel each other out.
How do you simulate only the secondary side? I mean, where to put an voltage source.
I simulated the attached circuit with...
Hello,
I'm doing my first transformer design, and I'm wodering what causes input current drop in attached circuit at around 300 Hz.
I know it is caused by capacitive loading, but still can't figure out what exactly is happening in the circuit.
(In the graph, the red curve represents current...
I believe it is a correct result ! As volker_muehlhaus wrote, your S11 refers to the port impedance and port impedance changes with frequency, so you will get perfect match at all frequencies. If you want your results to be normalized to fixed impedance, you have to check the box "normalize to...
It would make more sense if instead: "The higher the carrier frequency, higher is the bandwidth of the system." it said "The higher the modulating frequency, higher is the bandwidth of the system."
Optical communication has higher bandwidth simply because there is more "space" in frequency...
Thanks for answer,
This is my geometry, on the right, there is a ridge waveguide with very thin ridge, on the right is a rectangular waveguide and I the section inbetween is supposed to be my quarter wave transformer.
Yes, I'm using H10 mode
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Yes, I know, but I'm not...
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