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Thanks for your reply. However, I consider that the reluctance cannot be directly calculated, as a geometrical approximation would be really far from the real results. Moreover, what if the rod is not placed axially with reference to the solenoid (e.g. with a 45º degree angle)??
Thanks,
Hi,
I would like to know how to calculate the inductance of a solenoid once we put a ferrite rod inside it that only fills a small portion of its space. Let the magnetic field be considered constant (as the solenoid is long enough and the rod small enough): what is the flux increase due to the...
Hello,
If you want to make a narrow-band antenna, you can adapt it using stubs matched at the central frequency of your antenna. Firstly, you need to know the input impedance of your antenna. Then, you can design a LC matching network (usually by means of a Smith Chart) with inductors and...
Hi Paolo,
You'll better give us more information about your antenna. To begin with, to match the impedance to 50 ohm you will need a matching network. If your antenna is a narrow-band antenna, this network can be made with a RC circuit, commonly built using parallel stubs. If otherwise your...
Hello,
In my opinion, the other users gave you the most feasible causes. However, you should take into account the impedance of the source and check if the "impedance normalization" is properly defined. If the source impedance is different from 50 ohm and then the fields are renormalized to 50...
Hi streamlet,
First of all, thank you for your reply. Clearly, you understood my doubt.
Do you really think that s11 and Gain are calculated independently in HFSS? I don't know if it is possible, since the Gain parameter is calculated by means of the initial power, so it is affected by the...
Hi,
I mean that to compare two different designs, I need to ensure that both are simulated under the same adaptation conditions. That is, is I have an antenna with |s11|=-6 dB and another with |s11|=-12 dB, the radiation patterns will be obviously different, so I must reach a real admittance to...
Hi kekosat300,
Thanks for your reply.
I need a planar FM antenna, so I think a spiral antenna wil be the best option (although I want to simulate more than one structure). However, I think it is not possible to compare two different radiation patterns obtained at different adaptation rates, so...
The Bode-Fano criterion shows that you cannot reach a perfect matching over a wide range of frequencies, but a wideband impedance mathching can be obtained over a wide range if you define a maximum reflection coefficient for your application.
Hi,
The wideband matching method depends on the requirements of your device. Tipically it is achieved using a taper (Klopenstein or Exponential), which adapts the input and output impedance over a wide range of frequencies, depending mainly on the dimensions of the taper.
Hope it would help.-
Dear,
The use of Lange couplers seems a good choice for a certain range of frequencies, but I am not used to its usage, since its performance for low frequencies does not seem really optimum.
Do you suggest to use them under 1 GHz? The Thaysen balun has a reasonable good response from DC to 3...
Hi saadpaul,
I worked in the design of a planar wideband balun with the characteristics that you mentioned.
You can start with the ideas of "A Wideband Balun — How Does it Work?", by Thaysen, and then the design can be improved using FEM simulations. I did it and reached a 0 - 3,5 GHz balun...
Hi all,
I am designing a VHF small antenna using HFSS. Since it is a narrow-band antenna, I need to simulate the matching network to maximise the received power. Do you know what is the best way to do that, once I have the S11, Z11 and Y11 parameters?
Thank you.
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