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There is no need for a WLAN access point antenna o be omni directional. Actually a reflector antennas are ideal when there is a need for beam control. I'm not sure why manufacturers use omni directional rubber duckies in access points. Probably to suite everyone's needs. Yet I have seen many...
tem waveguide hfss
I have used waveguide port extensively in my simulations. The trick is to get the TEM modes of the waveguide to couple to the MS-line or a similar waveguide.
Here is what I do:
I draw the MS line (XY plane, X directed) on the substrate as a PEC boundary, and the ground...
Check whether the directivity and gain are more or less the same. This must be the case. In other words, mismatched antenna does not mean that it cannot have directed radiation patterns.
Yes you can. I'm not sure what you ment by CMOS sprirals, nevertheless simulating spirals using HFSS is bit of an overkill. Still one way to do that is setting up a two port simulation. S12 will give you some idea about coupling between the spirals.
Has anyone successfully used Empire by IMST in Antenna or any other EM design? I am considering to start using this software, your comments will be greatly valued.
Can i refer you to patent 5561435. Go to Google patents and download the claim. My understanding is multilayer Patch antennas are pretty old. You may also try suspended patch antenna in this design. It adds a bit of high dielectric layer between the first patch and the second one, changing the...
What you are getting is imaginary and real parts of the S11. Want the magnitude? Just square Imag and Real part and add them and then take the square root. To convert to decibel take 20 log of the result. Then you'll see the S11 curve as you see on the screen of the VNA.
Getting the Smith chart...
Since you have used the word air substrate I believe you have not defined the radiation box around the loop antenna structure. However, best is to post the simulation setup
ie3d antenna design
well IE3D manual is as good as this one as far as I can think. It is not well written.
My experience is that IE3D is only good for planar structures with infinite ground plane. I have simulated some slot antennas using IE3D. They came very well and the speed was impressive...
Freqzt,
Remember for 2:1 VSWR match with a 50 Ohm line , which is close to 10dB return loss or -10dB |S11|, you can have approximately 25-100 Ohm input impedance swing. Frankly, antenna can be matched according to the definition (i.e. 10dB return loss) even if it does not have 50 Ohm input...
At these frequencies printed on-chip antennas will be the tdeal. Bondwire antennas can also be used, or actually a bondwire is capable of radiating at that frequency.
My problem is, bondwire or onchip antenna, they will all be inside the lossy casing of the device. As a result, antenna...
Ultra Wide Band Antenna
UWB antennas need not be 3.1-10.6 GHz. As of today it can be anything from 500MHz to 7GHz. The DS-UWB standard has two bands, eachone 3.1-4.9 GHz and 6.2-9.7 GHz. There are Microstrip patch antennas in this range, like triangular F-probe fed antenna.
It is not the...
UWB Antenna
CST will be fine, but my experience is the accuracy is not that good. If it is only the S11 I suggest use of HFSS. But If you need the radiated pulses, use software in the time domain, CST or XFDTD (this is FDTD) will do.
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