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Hi Kaandee,
simplest way to use a balun in simulation is to use a quarter wave sleeve on the coax (a copper strip lembda(guided)/4 in length and shorted to outer of coax) to block the ouer shield current due to balanced to unbalanced transition.
I want to model the off state of a pin diode acting as a switch between two sections in my design. Should i make rectangle sheet touching both the sections and in the boundary select the lumped RLC and then use the proper value?? also does the current line indicate the direction of the bias...
Re: Pls help how to set the mesh size & stimulate port i
Mesh Size: HFSS generates mesh according the solution frequency provided in the analysis setup, now generally for bandpass structures the solution frequency is given as the center frequency otherwise it is given as the highest frequency...
Hi,
Can anybody guide me how to model diode in HFSS? I am not sure if it can be directly done using HFSS but is there other way that i can do it? I want to model diode to use it as switch in my antenna design.
Please consider it as urgent.
Thank you. Awaiting for your replies
-Ankesh
In my project i have 3 antennas, onr for 145MHz and two for 435MHz (at slightly different frequencies). I am using HFSS to simulate my antenna. Now i have used 3 excitations one for each.
how can i see the radiation pattern of antenna due a single excitation alone, as i did not get any option in...
Re: designing coaxial feed for antenna
Hi,
You can provide a coaxial feed to a microstrip antenna in HFSS by following way:
1. Determine which cable you are going to use lets say RG316.
2. Get its inner and outer diameter and the dielectric values.
3. model the coaxial cable in a seperate...
Re: PIFA simulation
Hi,
There are many tools available such as HFSS, CST, WIPLD. HFSS and CST are easy for modelling structures. HFSS is widely used and is FEM based which you can try.
Hope this helps
-Ankesh
Hi,
You can get circular polarization without going for truncated option by exciting two orthogonal modes of a rectangular patch antenna. Use a 90 degree phase shift for other using a branch line coupler and then excite the two modes (one along width and other along length). Hope this helps...
Hi,
A very big air box size or may be if the structure is large then a very fine mesh sometimes create problems. You may try to adjust these parameters and then go for analyzing the problem.
Hope this helps
-Ankesh
Re: HELP PLEASE: how to find length and width of my antenna?
Hi,
The position of feed relative to patch effects the impedance that the transmission line will see which will effect the retrn loss and hence bandwidth that is the antenna may not resonate at the desired frequency but a little...
Hi Nitin,
Thanks for your reply. Here are few more questions:
1. As far as I have learnt about the ports, wave port assumes an infinitely long waveguide of same cross section as of the port, so its characteristic impedance is now dependent on the shape of the port so how does it matter if the...
Hi,
Can you please elaborate as in what is the environment, Are you using any amplifier at transmit side, what kind of receiver are you using etc. in short you can do a quick link budget estimation that will help you a lot. As these ICs are meant for short distances like some 100 m or so. But...
Re: antenna design
Hi,
If you are going for a compact design then IFAs(Inverted F antennas) would be a good point to start with. Just use a single RF feed for each IFA corresponding to each band. IFAs are easy to tune (by adjusting the gap between the shorting bar and feed) and simulate...
help regarding HFSS
Hi,
I am learning HFSS by trying to simulate some structures, but I am very much confused about HFSS ports and HFSS designs like "driven modal" and "driven terminal". Can anybody explain to me what exactly is lumped port and wave port, what is the difference between...
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