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Hi all,
I'd like to create an infinite dielectric layer on the top of my antenna; therefore I create a virtual object with dielectric and set PML. If I do that; however, the result is incorrect. I think this is because my port impedance has been changed without air box. (If I used the radiation...
Hi all,
When we design the combline filter in microstrip technology, we usually can get one transmission zero at the higher edge of passband. How does it occur? I read the "wide-bandwidth combline filter with high selectivity" (please see the attached file), the author thought it is caused by...
Hi All:
We sometimes want our filter to have better selectivity so we will try to add transmission zeros at higher or lower bands. When I read the paper, they would use additional open stub or parallel-resonance to locate zeros at specific frequency; however, it usually accompanies with...
Hello everyone:
When I designed the elliptic-like filter, I would sometimes meet higher sidelobe problem. The higher sidelobe usually occurs at the higher band close to upper zero. Even I generate an additional zero in the stopband, it's still not easy to be suppressed. Please see the attached...
Hello Thanks for your reply.
I appreciate it...and read the book relative to antenna array and have the initial result. However, now I met another problem.
The problem is that I used Momentum and HFSS to simulate the T-junction power divider possessing two different phase outputs for antenna...
Hi everyone:
I met a problem on designing a millimeter-wave multiple-element antenna array with scan of 30 degree. My design methods are described below. At first, I designed a T-junction power divider with phase difference 30 degree (Both circuits and results are attached.) The result show the...
Dear all:
I studied the Chapter 2 of MW Transistor Amp by Gonzalez.
In Fig. 2.4.14 (p.130-132), the gain vo/vs > 0 dB (approximately 4 dB).
The impedance matching uses LC but no any active devices.
I try to calculate the gain by myself but still get the same result.
I understand something...
Hi, everybody
I'd like to simulate RFID Antenna at 13.65 MHz by HFSS. How do I setup my airbox? If I still follow the rule that the height of airbox is approximately quater-wavelength, it is huge. Do you have any suggestions? Thank you!
susceptance slope
Dear all:
I'd like to consult a question about reactance slope parameter.
I do not understant how to define the parameter.
As we know, reactance slope parameter x=ωo/2*(dX(ω)/dω) when ω=ωo.
Based on the classical microwave passive book written by Rizzi.
It can be treated...
stub bpf
Dear biff44;
Thanks for your kindly reply.
But I still have no idea what you mean "EACH resonator contains two of these model structures". In the classical filter book written by Matthaei/Young/Jones, it seems that the first and end coupled-line sections are not included the circuit...
parallel coupled line resonator
Dear all;
As we know, parallel coupled-line (PCL) BPF could be electrically equivalent with BPF with series stubs. However, I find a discrepancy between them.
At first, if we plot the equivalent circuit of each coupled stage of a PCL filter, we can obtain one...
filter relation between loss and q
Thanks for RF-OM's valuable comments.
However, I do not understand what the following sentence means.
As more narrow the filter is as higher the degree of filtering and more dissipation loss involved. For physical analogy we may say that narrowband filter is...
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