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Hi, Constant vswr circles are actually constant gain circles. Device itself has gain that coresponds to Gmax at a given frequency. By chosing the gain smaller that Gmax (selecting a constant gain circle instead of a dot that corespond to Gmax) you are mismatching the device. The mismach is constant on a constant gain circle, so is the vswr. You
Hi all, I am trying to export S parameter from HFSS to ads. I tried using matrix data and export S parameter and save it as touchstone file. However, when I opened this file, I get S parameters mixed Y, Z and vswr parameters. I would appreciate if someone can help Thanks.
Given a complex reflection coefficient, this measurement returns the voltage standing wave ratio. you can define a syntax as example: Examples a = vswr(S11) jackson.
Normaly I used vswr(S(1,1)) for vswr value reading. Can I read vswr value when I put a mark on the S11 trace without set any equation in ads ? Thanks a lot.
In fig 5 of this paper there is an ads model of the PIN diode Agilent HSMP-3810: RF,RFIC,Microwave,Systems Tutorials, RFMicrowave_Circuits_Files/Attenuator.pdf Hi, I have made a PIN diode model in ads with the help of this PDF. In Figure 13, a Simple model of the MACOM MAP202
Anyone who know how to add a vswr=2 circle in the smith chart in ads data display file?
Hi, How can I plot E-theta and E-phi 2D polar far-field radiation patterns in ads? I want to compare both? How can I do this in ads? What's the impact of Axial ratio, which is best low or high? How can I plot vswr vs. Frequency in ads? How can I know in ads, whether impedance is matched or not? (...)
No, the spec probably means the PA should be stable into a load of vswr=3:1. You may use a tuner element (i.e. a load pull tuner) to generate an all phase load of vswr=3:1 or lower.
Dear all~! Thanks in advance. When I check PA stability, I just check k-factor.(K>1) Is it enough to check k-factor for stability? or I should check others in addition. Please let me know it.
yes i agree with vswr khouly
Thanks vswr ( :) ) for the answer, this is what I expected but now, I'm much reliable ! Regards
Hello, It has been quite long time since I used ads for the last time! I believe you can do it very easily on ads... First, I'd like to say that as u may know, vswr is a measurement of loading effect on signal at transmission lines, or in other words, how big portion of the signal would propagate through the load. If that is what u are (...)
Design a low-noise single stage amplifier using microstrip on 1-mm-thick alumina substrate (εr =9.6) and a FET (proposed type: NE3210S01) with the following specifications: Center Frequency: 2.3GHz Bandwidth: 10% Gain (min): 12dB Noise Figure (max): 1dB Output vswr (max): 2.0:1 (matched to 50Ω source and load) i need
1-check your ports u should have vswr something between 1.4-1.027 2-send me the pic of the other S parameters 3-Chang your design by changing only the impedances of the circle if you have the same results then definitely it is a matter of definitions in design
I want to simulate the characteristics of DMB Mixer (Mini-Circuits ADE-1L) using a behavioral model in ads called MIX1 (polinomial model for nonlinearity:3), So from the manufacturer, Mini-Circuits, I have got the parameters that are most close to my application driving the LO with + 3dBm power : - Conversion Loss = 5.32 dB - Isolation betwe
Hello Pulkit, Did you expect good vswr over the full 1 to 5 GHz frequency range? The answer will be definitely NO. Do some study on the behavior of thin wire dipoles or monopoles and you will see that you need a compete other approach to make something that has good vswr/return loss over 1 to 5 GHz. Regarding the center frequency (your
any one knows the ouput's vswr of coax balun, the simulation is so poor, only 2 or bigger
I'm working on an LNA in ads 2009, with no prior experience with ads. I have a transistor model with impedance matching networks at the input and output of the transistor, with 50 ohm terminations at the ends of the matching networks. I want to measure the vswr at the input and output of the transistor (between the transistor and the input (...)
You can define an equation in the data display: vswr = It is even simpler. You can also use the vswr function that enjunear has pointed to: vswr(s11)
Hi, I want to calculate the Gain,vswr of a micro strip antenna which is designed. I wanted to see the Gain,vswr change with frequency, I'm using Layout Window to create the antenna. I would really appreciate if someone can guide me.
I have designed a X-band LNA. 1st optimize at the center freq point, then optimize with the desired bandwidth, al last need manually adjust. So I got about 10% bandwidth. So you can rely on the computer software and manually adjust both. More pole of PA match is the same as the filter. If you have a LC filter, you only have one freq point pole,
I am now designing a tri-way power splitter covering the frequency of 5.9-6.4GHz. using the traditional wilkinson's methods.But the vswr is very poor and the isolation between the 3 ouputs is also poor. As the frequency goes high,the circuit will be an distributed how to increase the perfomances? thanks Liu Yun
My boss asked me to design a impedance matching network , but I am at a loss how to handle it . Can anyone give me some instructions or references? Thank you. The parameters are as follows: f1=1890MHz Z1=27.8+j8.9 (L=700PH) f2=1900MHz Z2=28.5+j10 (L=855PH) f3=1910MHz Z3=27+j12 (L=1.04nH) f4=1920MHz Z4=29.3+j14.4
What is your filter requirement? Passband: insertion loss, ripple, group delay variation, vswr Stopbands: attenuation
Hello, Regarding the VHF part, what is the center frequency, required Bandwidth, required return loss (or vswr), is it used over a metallic or non-conducting structure (for example vehicle), input power (in case of transmitting), polarization, etc? When you have the choice, it is best to operate the antenna over a metallic plane (for example r
You lack several important filter specification parameters to judge what topology to use: - lower and upper stopband rejection - passband amplitude ripple - group delay requirements - insertion loss - input/output vswr - mechanical requirements (max size, interfaces/connections, etc)
I knew I had seen this recently in one of my books. Take a look at Rainee Simons, "Coplanar Waveguide Circuits, Components, and Systems". Several variations are discussed. Wadell, "transmission Line Design Handbook" has a little more info. vswr is right ..... stfw. Lot's of references there.
S11 is ok , in ur simulator u can also view the vswr . so u can be sure it will not exced 2 khouly
Did the MC12179 have an Application note? Some times they will give you a circuit to test their device. Also look at Fig 17 in the Link vswr gave, 10 Ω is a reasonable Impedance, depending on what frequency you're running at.
It's hard to beat a spread sheet for link budgets and cascades, especially since you write it yourself thus you re-learn lot's of concepts. I will usually do a spread sheet then compare that to results from AWR VSS, where things like vswr, ripple, and compression point are easy to handle. VSS is pretty slick (the RFA is a sub-set of it). It's
Hi, I want to reformulate my previous post by simple question: how to find the Q factor for a resonant antenna or a resonant Transmission Line using S parameters from ads or HFSS simulation. I know that Q is equal to fcenter/bandwith. How to calculate the bandwith, can i find this bandwidth from -10dB or vswr(S11),vswr(S21). I find (...)
I think CST is good. It can simulate S11, vswr, Impedance, radiation pattern, gain and many. It is easy for beginner.
Typically we talk about having a return loss of better than -10dBm or vswr of better than 2:1. I've (intentionally) built amplifiers that traded return loss for additional bandwidth, gain and/or output power. As your return loss gets worse, the efficiency, gain and output power of your amplifier degrades.
Thank you vswr but i have it from nec site and i think it's not completed. In attached file the converted spice to ads, you can remark that there are no ports and even i made the ports the model did not work, could you please verify that?
I am designing a 200W,IMD3<-40dBc amp for 57-63MHz operation with freescale transistor MRF6VP2600. I finished the circuit building, found a stable bias at Id=2.3A,Gain=24dB(f=60MHz) and measured the vswr with network analyze(Pin=20dBm),vswr1=1.4,vswr2=7.2 @ f=60MHz. Then I began to increase the input power(f=60MHz),I increased Pin 2dBm (...)
Hello, Before you start with any simulator, first try to understand some of antenna theory and try to figure out what you want. Some things to consider: required radiation pattern (omnidirectional , directional , hemispherical , polarization
I thank you for your reply Sir, I would also like some help with design and simulation of a 2.45 GHz LNA. Your help with this is much appreciated. what is your specs for the LNA NF? vswr? gain?
there is a ku_band directional couplers , the vswr is below -20,and the il<1.5dB,isolation>-24,but coupling is between -17dB~-11dB.I simulation in ads ,the coupling is -15dB~-16dB, could you tell me hou can i solution it??
You can also put a match stub on port 2 and port 3 to adjust vswr of S22 and S33. ---------- Post added at 22:47 ---------- Previous post was at 22:46 ---------- Or a impedance transformation microstrip at port 2 and port3.
Go to the Simulation-S-Parameters toolbox. Add a Term(ination) block, and an S1P block (you may have to go up to the blank box in the toolbar, just type in S1P and hit Enter). Also, add an S_P controller and set it up to sweep across your frequency range. Connect the Term to the lumped element circuit and ground the other end of both networks.
Assuming that Q is relatively high (say >10), you can determine Q based on the complex impedance versus frequency curve. For a circuit that behaves around its resonant frequency as an RLC circuit (for example quarter wave sections), the -3 dB impedance points are at the positions where |Im(Z)|=Re(Z). When plotted on a smith chart the cur
How do you define bandwidth? Frequently antenna bandwidth is defined as the frequency band where the SWR or return loss meets certain criteria (for example vswr < 2).