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Thanks for your replies. I found the answer.
In a smith chart tool, if we are moving from load to source of 50 Ohms , then we take a conjugate of destination point i.e. Source 50+j*0....
If we are moving from source of 50 Ohms to Load , we have to take a conjugate of load impedance and match it...
If I change sides so , Zl = 50 Ohms. and Zs= 25+j60 (My measurement from Network analyzer), is it the impedance of the system or is it the conjugate that i should match to?
I have a 1 port network. i connect it to the network analyzer to measure impedance. It gives me a value R+j*X. Now i want to match it to 50 Ohms for my frequency.
I have Agilent ADS as a software tool to calculate impedance. Should I put R+j*X in Agilent ADS Smith chart utility or a conjugate...
This may help someone having similar problem.
I had gerber files generated in CST MWS (RF designs) but wanted to make a panel for fabrication using Altium Designer. Altium easily generates GBR from PCB document but panelizing all GBR's into one GBR is a little different from what is available in...
is it the bandwidth that changes upon changing length and width?
Resonance frequency is where your return loss is minimum and radiation efficiency is good.
You must be following some formula for patch antenna structure that tells relationship of freq and some dimension of antenna.
Re: Antenna: Good S11 but poor radiation efficiency! Why?
This is front and back of antenna. Back side is the ground.
Practically, i was intending to solder a thin coax cable at the feed edge. With center conductor of coax connecting to CPW feed ( top) and the Ground wire soldering to the...
Re: Antenna: Good S11 but poor radiation efficiency! Why?
WimRFP: I increased port size but no difference on the above structure .:-|
Secondly, Ground plane is a just a copper layer pour on other face of dielectric. The face you see in picture above is front face. May be i am not getting your...
Re: Antenna: Good S11 but poor radiation efficiency! Why?
YES, The ground plane is on opposite side of this structure. The dielectric thickness betweent he two is 0.1016mm(4 mils) it is to be made on flexible PCB substrate so very thin!!
I didnt think GNP could be exclusively defined.
I am...
Re: Antenna: Good S11 but poor radiation efficiency! Why?
The ground plane I am assuming is bottom copper layer. so its finite ( just like practical scenario)
VSWR<=2 for 70MHz centered at 1.575GHz
Its supposed to be TE10 mode right?
Not sure how to expect current in slot antenna but here is...
Re: Antenna: Good S11 but poor radiation efficiency! Why?
It is grounded CPW feed and the red rectangle is a waveguide port, it coincides with edge of feed. Back side is full copper pore i.e. Ground plane.
You use Solve-> Optimize.
'Settings' tab gives you list of parameters you used to define planar antenna structure, chose the feed line's width and gap. In the goals, set S11 goal to be -20dB or below. It will run.
Sometimes value doesn't converge then you can use Solve-> Time domain Solver ->...
Re: Antenna: Good S11 but poor radiation efficiency! Why?
I am shocked at my talent of screwing up :-?
WimRFP: RL=-14dB at 1.5GHz and its not intended to be wideband. Copper has dielectric behind it which is supposed to have er=3.2 at 1.5GHz. So while defining new material of substrate, I put...
I came up with a preliminary antenna design which has a fair return loss, S11 = -14dB in simulation at 1.5GHz
However it has poor radiation efficiency as shown in figure
Radiation efficiency = -29.64dB
Total efficiency = -29.79dB
How can I improve it? What is the standard range of radiation...
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