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# s11 Bandwidth

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s11 s21 , formula for s11 , positive s11 , s11 s22
46 Threads found on edaboard.com: s11 Bandwidth

## How to make this UWB patch antenna better

How to make this UWB patch antenna better Hello Sir/Madam... Kindly see the attached picture. I have made a patch antenna. What I need I want to know how to make it better so that its radiation pattern will become uniform through out the bandwidth almost circular pattern. I want to also make its s11 Better so that its loss is minimum. How to

## Improve s11 of pifa antenna

To get better return loss (s11) first thing you have to change the width of the resonant plate, and second, to adjust the location of the feeding point. Now you have about -5dB return loss at 2.4 GHz. Perhaps you have to make it below -15dB to get a decent antenna bandwidth at the resonant frequency.

## measuring bandwidth with s11 graph

hi friend can anyone help me find bandwidth from s11 graph in db? is the formula for measuring? i know the frequency the below -10 db line is bandwidth.

## Evaluate graph of bandwidth

Hi everyone, I am having trouble about evaluating graph of bandwidth, how to make Matlab understand how good a graph is? Example: Resonant frequency = 3.6 and s11 at there < -10 dB, bandwidth about 120 MHz Is there any idea to do this. Thank you!

## Genetic Algorithm for antenna

Hi everybody, I am having a project about "optimization for antenna using HFSS simulation through HFSS API". My trouble is now when i export data under Excel or Matlab table from HFSS result, i dont have any idea to analyze these file in Matlab, such as s11 plot, i dont have idea how to make matlab understand what value of bandwidth is? Could you

## Metamaterials: imaginary part of permittivity being negative

Hello dear friends, I'm working on a new metamaterial structure that have nonlinear properties with in a broad bandwidth. I have simulated the structure in cst and got the s11 and S21 of the structure. with the relations given in the articles calculated permittivity and permeability of the structure. but there is an amazing point in the result and

## Bandwidth Optimization in Agilent (Keysight) ADS

First you should define equations for each optimization target.For instance let your targets are ?s11?<-15dB, ?S22?<-10dB and ?S21?=15dB. You must define these equations in " Measurement Variable" block being as-for instance Input_return_Loss=dB(S(1,1)) Output_return_Loss=dB(S2,2)) Power_Gain=dB(S(2,1)) Then your have to place a "Goal" block for

## microstrip filter design

One solution is to run the feed line separately with a 50 ohm lumped port or wave port at each end of the line. Use parametric analysis by changing the length of the line, from the resultant s11/S21 you can estimate the good length of the feed line which gives s11 < -20 dB and S21 > -0.5 dB in the interested bandwidth ..... I believe that (...)

## Antenna Bandwidth Calculation

Hi, I would recommand you to estimate you bandwidth where the |s11| < -10dB . Also you might find this thread helpful :

## What are the basic parameters for analyzing a Frequency Selective Surface?

But the FSS elements resonance frequency, bandwidth will vary with the following. So you have to consider, -TE/TM polarization ( your s11,21 will be different for TE and TM) -Incidence angle variation (theta,phi) -parameters of the FSS elements(like width, length, periodicity,substrate thickness)

## Printed IFA for dual band GSM900 and PCN1800MHZ?

Hi guys, I was designing IFA for dual band operation using SIM900A, I have 100x15mm PCB space to lay the antenna. I got the s11 and VSWR very good in HFSS, but the bandwidth is small (it doesn't cover all the frequencies especially at the higher band (1710 - 1880MHZ) the s11 at these band edges is no more than -3dB. and the VSWR is more (...)

## bandwidth measurement

although S21 is the graph that will define bandwidth..... but if you want to extract bandwidth info from s11 than for general understanding u can say ... "the band on which the magnitude or s11 is below -10db or more (-20db, -30db etc) is your bandwidth... as because where S21 has its positive peak on the (...)

hi help thanks

## how to determines bandwidth of Microwave components

Hi, bandwidth in RF components is defined with respect to its s11 or returnloss.. Theoretically -10dB is taken for a mark but the lower or more negative the better. Industries take atleast 16 dB as reference and the band that falls below this in returnloss is taken to be bandwidth of the component..!! Regards

## Calculating Bandwidth of S11

Hello Anyone know about how to find the bandwidth of s11? Is there any formula? I have attached an example picture. thanks

## Antenna Bandwidth computing

Its also worth to check the gain in this frequency range to make sure that your antenna radiates. The s11 only shows a good match, but not what happens with the energy!

## UHF RFID TAG Antenna Broadband Design

See this Sonnet application note for a 900 MHz tag layout with extended bandwidth: What do you mean by "HFSS s11 formula is wrong" ?

## Gain and bandwidth calculation in HFSS...?

I have simulated a rectengular patch antenna(linefed) at the centre frequency of 2.4 GHz. The results (s11 and VSWR) are so confusing.. the whole plot of s11 is below -8dB and VSWR below 1.80.. Is it correct..? How can we calculate gain and bandwidth in that plot?? What is the formula to calculate bandwidth? Can anybody (...)

## how to simulate UWB pulses in HFSS?

Do I excite it with modulated Gaussian pulse? or would a lumped port just do? What's the difference between the two? I have a dipole antenna excited by a lumped port and displays s11 bandwidth (2-6 GHz)below -10dB. Is that considered a pulse? Please elaborate and excuse me if the question is so basic. Thanks.

## WAveguide to Coax in HFSS

Given that the transition is almost lossless, you can also optimize for s11.