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27 Threads found on edaboard.com: Return Loss Measurement
calibration becomes more important the junkier your VNA is. If it is not a good 50 ohm source....and your cables have poor return loss....a proper calibration can cure some of that.
Hello everyone I have LNA mixer ıf amplifier and ıf filter on the pcb and I want to measure signal power,return loss, inertion loss on the pcb what is the best solution for this. Should I put directional coupler every spot or any other method to measure signal Thanks in advance
Very gray area giangriff88. When measuring the output "power" of a VNA with a power meter, you will get a reasonably constant output across a good 50ohm load. For non-50 ohm loads, your voltage drop across your resistor proportional to the reflected energy. Review a VSWR/return loss table.
Dear colleagues; I am working on wifi and bluetooth boards. And try to measure antenna isolation between antennas. I applied the proper coax cable to vector network analyzer (vna) and perform the calibration. Then connect the coax cables first to wlan antennas (2x2 system). Result is seen as below; 105911 Then remove on
When calculating or measuring the return loss or S11 for an antenna, is it only considering the copolarization wave reflections only or is it considering both the copolarization and crosspolarization waves reflections?
There are two things going on in your design. 1. As you already mentioned correctly, the bondwire transition degrades the performance of the filter badly. You can see this in the simulated return loss of the filter. I assume the return loss caused by this transition is around 10dB, but you have two of them. In order to get (...)
You didn't mention, but I'm pretty sure you are talking about a simulation of 0dB return loss, and not about real measurement on a built power amplifier. Old radio designers use to say when building high power tube amplifiers: "Tune for maximum smoke" But don't follow this rule :-)
Title is important?? I'd design mixer by bjt then bpf to backend circuit. By matching mixer in port at 50ohm and return loss < -15dB. My manager told me that i need to use Network by calibrate S21 and measurement Mixer+bpf response that S21 gain must be above 25dB. His argument is correct or not ?? have a really paper or http (...)
The title says it all. A return loss is normally a positive number. If half the power reflects back, it is a 3 dB loss. If you return loss was -3 dB, it would imply a gain.
now i'm designing a dipole antenna with apply the discrete port in between the gap.But the problem is I don't know how to implement it to the hardware part, so is it anybody know when i fabricated it on the PCB,what kind of connector i should use to do the measurement on return loss and radiation pattern. Very need you all help,thanks you.
Directivity of the reverse coupler is very important when measuring the return loss (in dB). When return loss (in dB) equals the coupler directivity (in dB) the measurement error is very high. For the forward coupler the directivity is not such important, because in this case the coupled signal level (...)
Hai u should measure the "return loss-s11" value using Network Analyzer and it should be -10dB min ( or above than that) in ur operating frequency and check bandwidth. If it is working fine then u go for radiation pattern measurement in a anechoic chamber.
There could be VSWR bandwidth, or gain bandwidth. VSWR bandwidth could be measured using the VNA and generally indicates the frequency range between margins where VSWR of the antenna is better than 2:1 (or lower than -10dB return loss). For gain bandwidth need to use a radiated setup for antenna gain using the VNA and a reference antenna (usu
Greetings, I need to optimize my structure in HFSS to get the best fit between the simulation results and measured one. When, I import the measurement data in HFSS and try to make a subtraction from simulation results it seems that HFSS does not allow me to do this so. I wonder if you guys to help me to find a solution for this problem! T
If you don’t have a Network Analyzer you can measure the VSWR (and return loss) using a signal generator, a directive coupler, a detector (or a spectrum analyzer), and a matched load. Γ=(VSWR-1)/(VSWR+1) RL=-20*LOG(Γ) In this way you measure only the real part of the impedance.
Hi, I want to use a Spectrum Analyzer to measure the return loss of an Antenna at certain frequencies. I've read that this can be achieved using directional couplers. Can anyone explain how the directional coupler will extract the reflected signal from the antenna, and what specifications are needed in the design of such a coupler (isolation, di
There are several companies offering antenna measurement solution with VNA only. this suggest that one port of VNA works as RF-source while other works as power meter /spectrum analyzer. Can somebody help to explain the function. for return loss (S11) it is OK. but for gain, it is not that trustworthy. you need to make
Would it be possible to connect a semi-rigid on the feeding port of the PIFA? Then, take measurement for the return loss/BW through the network analyzer and perform radiation pattern test in chamber?? P.S. It would be better to include the casing of the product while measurement was taken. Merry Christmas
dear all, how to measure ( GENERAL PROCEDURE) the return loss vs frequency for an single port antenna using a network analyzer? also the radiation pattern. plz give me the step by step procedure. ( N/W ANALYZER IS HAVING TWO PORTS. BUT ANTENNA IS HAVING ONLY ONE PORT. ) with thanks in advance, kbmani
His measured input return loss is around 10dB so the imput impedance is either 25 or 100 ohms. You can't tell which since the graph is a scalar measurement and you would need to see a vector measurement. reflection coefficient = +0.32 or -0.32 refrection coefficient (in power) = 0.10 VSWR = 1.92 (5.69 dB) reflection (...)