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To submit a patent application, does the sequence of the inventors make any difference? I know for a paper, the first author or second author has a major difference.
For the waveport, the definition of the input impedance is clear. But how does HFSS calculate the input impedance of a lumped port? Does the port have to be referenced to ground? Want to know a little more in detail but can not find it. Hopefully someone can help me. Thanks!
PhD or Job?
It depends on the field you are working on. For circuit area, if your major professor for your PhD has a lot of experience in industry, you can pursue a PhD first . Otherwise, it may be a better idea to have some industry experience first.
The directivity of an antenna is based on only the sturcture of the antenna. It doesn't include the loss due to the antenna mismatch. If you check the gain of the antenna, you should find that the gain of the antenna changes with the input impedance mismatch.
Usually, the gain of the antenna is not a constant, which depends on the spatial coordinates. The received power should be calculated by Friis transmission equation. It can not be simply calculated just like a power amplifier.
hfss lump port
If the size of the lumped size is too big, you may have to change the dimension of the simulated structure in order to leave the space to the port. In this case, the size of the lumped size does matter.
Group velocity means the velocity of energy flow, which
can not faster than the speed of light; only phase velocity could be faster than the speed of light.
The publisher doesn't do that much work for printing a book since the author has written the book in word or pdf file. The cost is quite low for printing a book nowadays. I believe the author doesn't receive a reasonable portion of the royalties.
I was told that in USA, even the sale price for each book is above $100, the author only get a few dollars for each one. Is that true? I just can not believe that the publisher makes too much profit.
Re: chip antenna
The antenna or called RFID tag is good in free space. But if you attach it to the metal or conductive surface, it won't work. There are some RFID tags which are specially designed for metal surface.
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