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# s21 And Antenna

49 Threads found on edaboard.com: s21 And Antenna

## Impulse response h(t) of UWB antenna from S11 parameter

S11 can only give reflected pulse shape (by applying fourier transform), For transmitted/received pulse response you need s21 measurement.

## Antenna matching network efficiency

Hi everyone, I am currently designing a matching network with DTCs (digitally tunable capacitors) and I am struggling to properly calculate the corresponding s21. Correct me if I am wrong, but it seems to me that it is not correct to simulate the matching network s21 in a 50 Ohm environment while the antenna input im

## How to calculate Envelope Correlation Coefficient (ECC) in HFSS

Hi to all; I want to calculate the envelope correlation coefficient (ECC) for my 2x2 MIMO antenna. I have Simulated the antenna and got quite satisfactory (90%) results S11,S22, s21 or S12. Now I want to Calculate the ECC in HFSS using the S-Parameters. Is there any way to Calculate ECC in HFSS? How ECC can be plotted (...)

## Simulation of two monopole antenna

Hello, i succed to simulate two monopole antenna in hfss but i dont understand the simulation results because i m beginner in hfss: The difference betwen S11, S22; s21 and S12; RF books will teach you about S-parameter. Guillermo Gonzalez, "Microwave Transistor Amplifiers, Analysis and Design, 2nd. Ed.", Pr

## Signal generator and spectrum analyzer vs VNA

Does that mean i measure s21 since i use two different terminal/port? no. antenna is single port component. an amplifier and filter is dual port. whatever device (antenna, filter or amplifier) which needs two network analyzer ports to connect is two port and so forth. Did you use the same (...)

## how to plot s(2,1) in HFSS for microstrip patch antenna

thats right ... but without s21 how permittivity and permeability plots can be obtained for metamaterial antenna...... so that negative refractive index can be verified I would test the metamaterial independently of the antenna. What kind of metamaterial are you using?

## Open circuit and short circuit a port on CST

I understand that you have one model with two antennas, and each antenna is connected to a port. Now you want to simulates the interaction between the two antennas. First you get s21 from the 2-port simulation. Then, instead of creating two additional 1-port EM models (one with (...)

## [Moved]array factor calculation for array antenna

Dear all i want to know how to draw the array factor from s21 paramteters,for example i have an antenna array and simulated it in HFSS and i want to extraxt the s21 and calculate the array factor? can anyone help me thaks in Advance mohamed

## Antenna transmitter and receiver in HFSS

This question has been asked before, but really no firm answer has been given from what I have seen in the posts. Question: I need to simulate 2 antennas and measure the s21 between them. Do I excite both antennas or just one considering both are matched? What am I measuring if I excite both and what (...)

## How to improve S21 antenna?

Could someone kindly tell me the techniques to improve s21? My antenna uses 2 ports: port1 uses CPW on the top of substrate, port 2 use microstrip line on the bottom of substrate s21 is <-8 dB now, i hope it will <-15 dB and keep the same antenna's operation. Thanks!

## How to define the port of Tx and Rx antenna of wireless power transfer in HFSS

1) assign the second port (port 3) to the second terminal of the Rx antenna. Adding a port doesn't mean it is adding an excitation signal. s21 is the power received at port 2 relative to power input at port 1. 2)I'd recommend modal, but I'm not an expert on the issue. I use terminal solutions for differential signals and modal for (...)

## Feed line matching with antenna

It seems to be a problem with VNA measurement setup. 1. VNA impedance calibration and correct delay/port extension must be set for the location where you intend to place the matching component to get desired impedance at this point. 2. Correct matching component should be selected based on real s21 parameters for actual component family, for best r

## Ie3d mutual coupling

The software can not tell you s21 of antenna, I guess so. Except you setup a receiving antenna, and test the finally received signal from the receiving antenna. Then comparing your antenna with a known antenna, maybe you can know the s21 of your (...)

## simulation microstrip antenna in hfss

If You are focus is on designing Microstrip antenna i suggest that you should use a Software called ADS by agilent this software entirely focused on antenna desingn. You can very well see the S11 s21 S31 in it at you can very easily attach ports to it Just use this software and you don.t need to re design it just transfer (...)

## Isolation of two antennas using HFSS

hai all, My transmit& receive antennas are endfire type and separated 1m distance.i wanated to estimate Isolation of two antennas using HFSS.I simply placed two antennas at 1m distance inside the radiation boundary. each antenna have its own waveport excitation.when i plot s21 i am getting (...)

## equivalent circuit model for dual and triple band antenna?

i was drawn the below circuit on ADS for triple resonant frequency, but i dont know it is true or not, because it has triple resonances but in s21 not S11 66448 If you replace port 2 with a resistor, to represent the radiated energy ... ?

## S21 of dielectric rod antenna shows ripples in CST simulation

Hi There, I have been working on dielectric rod antennas. In order to check the power received by the antenna i used two dielectric antenna at a distance and measured the s21. I am using CST 2010 for the simulation. The s21 response obtained w.r.t. frequency is not smooth curve rather (...)

## Matching of Differential Fed Antenna

Dear all, I am working on Differential Fed antenna. For single-end antenna, we use S11 to evaluate the matching. but how to evaluate the matching of Differential Fed antenna which has two ports excited by anti-phase signals? we can measure its S11, s21, s21 and S22. Any reference would (...)

## MIMO antenna design at 2.4 ghz plz need an idea

i did a design of a pach MIMO antenna 2*2 at 2.4 and i have a good matching at s11 at 2.4 ghz but the s21=-10db so the coupling level is high and i want to reduce the s21 to -20db . how can i do it any suggestion any help. thank you

## How to measure S11 on active antenna using Network Analyzer

I should have been clearer. You need to sweep the frequency while measuring s21 on the network analyzer. If one of the antennas is a known good broadband one, then the transmission hump should equal the center frequency of the antenna under test. In practice, sometimes this works, sometimes not. If your (...)

## S2,1 and S1,2 parameters in CST

Hello All, In an attachment to this message, dipole antenna model is attached. can any body have suggestions, how to improve s21, s12 parameters without changing distance between dipole antenna.Impedance matching is almost perfect.

## how to measure the Scattering parameters of an RF front end integrated in the circuit

Hello, I would like to know how we can measure the scattering parameters (S11, s21, S22, S12) of CC1190 Texas Instruments RF front end which is integrated on our circuits and we only have one connector: the antenna connector at the output of the CC1190 matching network. We have one connector at the output. Then we would need something (...)

## measuring S paramters between two componenets in ADS

dear friends i have connected my coupler with the antenna. so both the input side are terminated in 50 ohm. the only thing i can measure is s11 s22 and s12 and s21. is there any way i could measure the forward transmission or the s parameters on the other side of the coupler, the ports of coupler connected to the (...)

## [hfss] getting s21 of 1 sending and 1 receiving antenna

I'm trying to get the s21 variable of 1 sending and 1 receiving loop antennas using hfss. I used 'Driven Terminal' as solution type and 'lumped port' for port. I want to give a signal into sending antenna and find the signal of receving from receiving port. As i mentioned i defined lumped (...)

## [hfss] I would like to design 1 sending and 1 receiving antenna

I'm trying to get the s21 variable of 1 sending and 1 receiving loop antennas using hfss. I used 'Driven Terminal' as solution type and 'lumped port' for port. I want to give a signal into sending antenna and find the signal of receving from receiving port. As i mentioned i defined lumped (...)

## Measuring Mutual Coupling

s21 and S12 must be the same

## Array Antenna power splitter

Hi all im making a 8 element linear array at 9.5GHz and i have made a simple 3dB power splitter for a 2 element array and i was wondering if the graphs are ok both the s21 and S31 are around 3dB however in the smith chart it is not around the i was wondering was that ok :| can someone please help me

## Relation between S11 and S21, S21 and antenna gain!

I saw one equation, |S11|2+|s21|2=1 This "power conservation" is valid for a lossless circuit only. Another question is: what is the relation between s21 and antenna gain for the antenna? There is no "port 2" in the antenna, so it is difficult to answer. But it would help you any

## use of vector network analyzer

In fact using a VNA you can measure the most important characteristic of the antenna: the Gain. For this you need a reference antenna connected to one port of the analyzer, and the DUT antenna connected to the second port. Measuring the s21 is giving you a relative information about gain of your (...)

## HFSS antenna as a receiver

joskem, did you finally figure out how to measure power received in Receiving antenna in HFSS? I have the same problem and would appreciate if you would share your experience with me. From the above discussion I gathered: Power transmitted by Tx antenna = Power accepted Power received by Rx antenna = ^2

## can someone send me a hfss model simulating Group delay

can someone send me a hfss model simulating Group delay? need a hfss model simulating group delay and s21 of a uwb antenna . thank you

## Antenna excitation in CST

You can define 2 ports and observe s21 parameter. This will show how much from transmitted energy is received by second antenna. S12 will show contraversa relation. What kind fo antennas you are dealing with?

## Positive S11 S21 in free space meas. with VNA Agilient,

so you used some horn antenna setup with perhaps 10 db of insertion loss, and told the network analyzer to use it as a 0 dB loss thru section. Then you put some sample in the way and found a slightly positive s21. and, your question is what?

## How to plot radiation pattern with S21 value

Would be a relative measurement. Record the s21 for a particular frequency and particular DUT position. Rotate the DUT with an angle (let's say 15 degrees). Record the new value of s21 for the same frequency....and so on, until reach 360 degrees.

## resonance and solution frequency

HI! i want to simulate and compute the radiation effeciency (Radiation->copmpute antenna parameters) of my resonator in the resonance frequency. the problem is: when i set the resolution frequency = resonance frequency , i see a shift of the resonance frequency in the s21. could you help me understanding this? (first i (...)

## how to differentiate filter fron antenna

Hello, Just See the Radiation Patterns to differentiate between antenna & Filter... & also E & H Fields... Are you referring to Differential antenna ? (If not then it is a Single port device which doesn't have s21!!!) ---manju---

## Problem regarding S21 Parameter

Using s21 you will see, as you correctly assumed, the ratio between transmitted and received power. I.e. loss of feeders, gain of both antennas and the pathloss. If you do want to charactierize the matching of your antenna, use S11 to get this

## Slot antenna 4 higp - validation error occurs

I am try to simulate slot antenna with higp I do that there is no occur validation error and simulating enough time but i didn't gain s11 and s21 parameter I just have white solution paper :) higp pec submaterial touching slot antenna occur any error ! shoult it be any interwall between them ! higp (...)

## mutual coupling microstrip antenna, GA,HFSS

i want to calculate the s21 of two rectangular microstrip antenna with multilayered dielectric using HFSS v9, and consider this value as the fitness function of genetic algoritm written in matlab . How can i do the link between matlab and HFSS v9?

## Antenna element to element RMS amplitude

Hi, I'm doing a course measurement of amplitude using a loop probe and a vector network analyser. I measure the s21 amplitude and want the relative element to element RMS amplitude. Do I need to convert these numbers to "voltage"? If it has to be voltage why? Vn = v1/v2 = 10^(dB/20) ? Then use RMS = √(Σ(Vavg-Vn)?)/N) (...)

## antenna efficiency Help Reqd

Have to use a Network Analyzer because you need S11 and s21 measurements, and for accurate measurements you need an anechoic chamber. antenna efficiency is: the ratio of the total radiated power to the total input power . Total input power is: total radiated power minus power loss due to resistive loss

## Design a patch antenna fed by coplanar waveguide

Hi, I've run simulation of a patch antenna fed by coplanar wavegide using Empire Xccel. The problem is I didn't know how to put the coplanar waveguide to the patch antenna. I've put the coplanar waveguide above the dielectric substrate of the patch antenna and I've got weird s21 parameters. I need (...)

## antenna effect of microstrip

I measured a microstrip structure on PCB, at certain frequency the s11 gets lower sharply, but s21 does not increase at that frequency, so I guess whether the power is radiated at that frequency and the microstrip structure acts as an antenna, could some experienced person give me some guide? Thanks!

## How to plot a frequency Vs output power graph in CST Microwave Studio?

Hi , I need help with CST Microwave studio. I want to know how we can plot a frequency Vs output power graph. Say by measuring coupling s21 with a test antenna and in post process template converting this to power and plotting . Is this possible , or by writing Macros. thanks GV

## Gain and Diractivity of Antenna

In the drawing, he is measuring s21 (total loss) between the antenna under test and a known good antenna. You rotate around the antenna under test and get a relative gain pattern. THEN you substitute a standard gain antenna (one that you know what its gain (...)

## where i put the ports in parabolic dipole in XFDTD?

i put two ports at edges of dipole with the same polarity and with different polarity but the program think it two different antenna and give me rong s11 and s21 . the example in usergide use the dipole as wire and make the feeding in center but in my case there is distance between them. (...)

## UWB-Antennas Simulation

Well, if you have the transfer function of the antenna (s21 mag and phase to a receiving antenna), you can just do a fourier transform of that to see the time response. Of course, the bigger the simulation bandwidth, the more accurate the result will be. In other words, if you know the transfer function (...)

## antenna mutual coupling

Hello all, I want to know how close can I put 2 receiving antenna (patches) so that their phase response will not be affected by each other, what I want to say is that if I put the antenna at a distace d>>10λ and I measure ANG{s21}=a, how close can I get the 2 antennas so ANG{s21} (...)

## Measuring physical length of transmisson line

Try to use configuration of two identical antennas separated by R in deaf chamber. Then: abs(s21)^2=G^2×lambda^2×(1-abs(gANT)^2)^2/(4×pi×R)^2 where s21 is measured by network analyser, R is distance, lambda is wavelength, gANT is refl. coeff. of antenna and G is test antenna gain

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