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Hello, XBEE Digimesh radios are already FCC Compliant. However the radio modules require a PCB to be designed that the radio can be mounted on and supplies power for the radio. Is it necessary for the PCB to undergo EMC testing? The entire unit is already an intentional radiator so whats the...
Hello,
I am currently working on a project at work that involves packages being sent around a plant on conveyor belts. Each conveyor belt is broken up into a number of individual positions. Each position has a number of state machines associated with it. I.E a package arrives at that position...
Hello,
Can anyone recommend a high gain, low power BJT for use at 450MHz?
I have been using the BFT25 but I was wondering if there is something out there with more gain. 10LogS21/S12 is roughly equal to 14db.
Thank you
I measure the s parameters of the component then save it as an .s2p file. Then I place a .s2p component in the ADS and simulate with it. Otherwise I believe you can specify a component that is an equation.
After correcting the permeability and tangent loss I was able to successfully measure the 47ohm shunt resistor and 22ohm series correctly. Thanks everyone for their help. ADS also managed to optimise the values for L and C for the SMA connectors over a small frequency range.
Thank you
I will investigate what sort of accuracy I can get with electrical delay and post the results.
E Kafeman would you mind measuring a 22ohm resistor between port 1 and port 2 of your VNA and posting the results?
Without DeEmbedding I received similar results to you with a 47ohm shunt to ground...
I have attached the substrate definition I have used aswell.
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I have previously tried performing an in circuit calibration of the text fixture, it was innaccurate. What do I use for the standard definition tables? The VNA I have only has standard definition tables for SMA...
Below is my Advantest VNA with S parameter test set. I have 0.5m Jyebao cables (not sure of the spelling). The cables have a DC block on the ends. Measurements were taken at -35dbm
Shown here is the cheap SMA RF calibration kit I got from RFSHOP.com.au supposedly good upto 5GHz.
Here is the...
I have been reading agilent application note Application Note 1364-1. According to this document I need to model the SMA connectors and the parasitic interface to the PCB.
I have attempted to determine the parasitic components but unfortunately ADS does seem to be able to produce a solution...
1.I imported the PCB DXF file into ADS Layout (Momentum).
2.I specified all the parameters such as thickness of the substrate, permittivity etc.
3.I added a bunch of ports to the layout at points where the SMA connectors sit and the 0805 components are mounted.
4. I measured the S parameters...
Hello,
In an effort to improve the accuracy of my RF design, I have created a PCB for measuring 0805 smt components in a series and shunt configuration. See below.
Using momentum I created a layout component of the PCB. I measured the S parameters of a 22ohm resistor placed between port 1...
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