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thx all for the helpful and interesting replies.
I decided to use the gain comparison method so I'm looking for a 3rd antenna to use as TX and then I'll compare the DUT S21 with the standard gain horn's. This should lead to more precise results rather than the way I was planning to do.
Thx...
Thx Darkcrusher for your reply but I don't understand what you mean, I only have 2 antennas: the standard gain horn and the unknown gain antenna.
The standard gain horn is used as TX antenna and is always plugged at VNA's port 1 whilst the unknown gain antenna is used as RX and always plugged...
I've found many post on this topic but none of them cleared all my doubts.
I want to measure the gain of one antenna using a VNA and a standard horn antenna (with gain data-sheet).
The idea is to use Friis formula in this way:
1) Pr = P0 Gt Gr λ^2 / (4πR)^2
where Pr is the power received, P0...
Title says it all, I need to excite a TM mode (like the one excited by a coaxial-fed quarter-wavelength probe over a ground plane) using a patch or slot antenna.
I started by simulating with HFSS a microstrip fed annular slot antenna but I still don't get what I want. Do you think this geometry...
Is it possible to excite a TM mode (like the one excited by a quarter-wavelength monopole over a ground plane) using a slot antenna? And with a patch antenna?
Any specific reference to paper/books/etc will be very appreciated.
material courant limit
rule of thumb for cell size is:
dx <= λ/20
where λ is the shortest wavelength you want to simulate, then, as already posted by iyami
dt <= dx/(sqrt(3)/c)
the Courant factor would be 1/(sqrt(3) which is the limit for stability.
I usually use .99*1/sqrt(3) but u might need...
how to make oblique
u can implement an oblique incident wave by multiplying the field you would use for a normal incident wave with a phase term.
the phase term is a function of position.
for example, lets assume you excite an incident wave in a 2D simulation by forcing the E field at y=y0...
book matlab graph
Hi, i gave a quick look to Balanis and in your matlab files there are few errors.
First of all I woul suggest you to avoid to use i as counter for the for cycle coz i is also sqrt(-1). I usually use ii instead of just i. Also sum is a matlab function so u'd better use another...
Re: [500 points] Comparing harmonic radiation patterns in HF
I'm not sure if I understood what you are looking for, but in HFSS you can plot the gain of the antenna, which already takes into account the efficiency.
You could also compare both gain and efficiencies of the two antennas at the...
hfss pbg
How would you simulate a 2D triangular lattice PBG with HFSS? PBG is composed by a triangular lattice of dielectric rods in air.
I don't know how to set the master slave BCs and how to vary the phase relations between them: would you define 3 pairs of master-slave BCs on opposing...
Does anybody have some VNA S-parameter measurements data of material samples in a waveguide or a coaxial sample/holder?
I'd like to test a piece of software I wrote to extract material properties from S-parameters measurement and I need some reliable measurement data to do it.
Another question...
I want to do some S-parameters measurement with an HP 8510B using the port extension capabilities. In particular I want to extend the reference plane on one port because I need to connect a straight waveguide assembly. I tested the port extension using a short at the end of the inserted...
I want to do some measurements using x-band waveguides but I'm a bit confused about how to realize a TRL calibration.
In particular:
- Trough: can I just connect directly the flanges of the two assemblies where I want to define my reference planes?
- Reflect: can I use a shorting plate on the...
To be honest I'm not totally sure about the metal composition, but I'd say brass or bronze.
I have several assemblies to clean: mainly straight segments (50 to 150mm), round bends in both planes and coax transitions; all the assemblies are for x-band (22.8mm x 10.09mm section).
regards
I need to clean the interior of several waveguide segments, bends and so on, which have not been used for years. There is dust, bugs etc in them, how can I clean them?
Which products/methodology should I use in order to not damage or pollute the interior walls?
regards
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