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I am just trying to design a feed system. I need to make some of my lines longer for the transmission lines not to intersect. If I double the electric length for one tranmission line (from 180 to 360 degrees) do I have to change the dielectric length for other transmission lines in the feed?
The transformer isn't the point here. All I want to know is; if I change the electric length of one transmission line (like the 100 ohm trl) do I have to change the electric length of all the other trl's in the feed?
I am building a conventional feed network using lambda/4 transformers to feed my patch antenna array. Sometimes, I need to increase the length of my transmission line to fit everything. For example, I have a 50 ohm trl as a starting point, when I split that trl I have two 100 ohm trl branches...
Generally speaking, the antenna itself is not aware if it's supposed to be a transmitter or a receiver. How do we test an antenna for it's receiver capabilities? Do we look at its total isotropic sensitivity? I have found this term to describe the whole receiver system including the antenna. I...
File 1: CST simulation S11 graph
File 2: Keysight VNA S11 graph
Yes, the resonant frequency has shifted to the left!! But what does that have to do with the radome decreasing the gain?
The material is Hei Cast 8150 (dielectric = 3.7 & loss factor = 0.035) which is an alternative material for Polylac in both simulation and in real life.
I checked how plane waves react to this material by using a horn antenna and it showed a decrease of 0.5 dB as well when the radome is put...
True, we are talking about half a dB of gain increase - or more - at different frequencies, I have attached the front and back view of the antenna and the metallic back plate. I am also attaching the CST file because in case you would be kind enough to take a look at it.
Another thing is that...
I have a simple 5 GHz patch antenna in my hand. When I add the metal back plate that is going to help mount the antenna to the radio into my simulations, the gain increases noticeably. I have attached the gain and return loss results for just the patch simulated alone and when simulated...
I am designing a conical horn antenna at 60GHz to be used as a feed antenna for a parabolic reflector. I have calculated all the dimensions w.r.t. 60 GHz (especially the rectangular waveguide part) but my S11 looks messed up. In other words, why don't I have a notch at 60GHz and have good return...
Yes I see. When I calculate the zones for my reflector, they turn out as follows:
- Rayleigh Region: 2.49 m
- Fresnel Region: 55.26 m
So to detect far-field patterns, the reflector must be placed at least 55.36 m away. But according to this link...
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