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Hi Nanda,
For Feeder, You can use a horn antenna. It has wide band width and should meet your requirement. Check this link.
www.antenna-theory.com/antennas/aperture/horn.php
If the load parameter is not shown during plot, then you can simply write the equation fro Impedance with S parameters and plot the variable that you use..!!
Are your above attachment of error after the corrections suggested by Bigboss??
You have large variation in results from MWO to ADS .. I believe you have some setting not right in one of the simulation tools. Check for Mesh density, I can also influence your results.!!
Try putting an additional surface of rectangle at the port and draw ur excitation over that surface, as generally used for waveport. if it still gives the problem, why not subtract a section of ur box at the input port and give ur excitation so that the port will not touch the box
Re: How to design Microwave Filters , Power Dividers or Couplers Design
What pozar shows are matlab simulated results as of my knowledge. I plotted S params for that and a hybrid coupler and some other designs in matlab and yes you get 40 dB and more, coz its theoretical. Practically it depends...
re: How to design Microwave Filters , Power Dividers or Couplers Design
Frequency is what you need to evaluate your design parameters like the length and width of the microstrip traces. for any design, Insertion loss: as minimum as possible. for a power divider (2 way) as close to -3dB as...
In your plot of s11 over frequency, the value of s11 in dB for your frequency of interest gives the return loss of your devices, adding to it, the frequency with maximum dip in return loss shows its resonant frequency. In your plot of s21, place a marker at the peak its ur insertion loss, if you...
adding to the above if its a two port device then your s21 gives your insertion loss.. The loss at the center frequency of operation is mentioned to be the insertion loss in data sheets..!!
Basically an antenna is a single port device. I don't understand what exactly u r trying to do with two port ?? are they both used to feed the antenna if so ?? your s21 improvement, are u looking for a decrease in value of increase ?? I'L take u want to make the s21 more negative?? does ur...
I doubt if it is possible to do antenna as receiver analysis like that. coz if u place a copy of ur antenna to be acting as a receiver at a distance, it will be as though u have place a tx antenna patch and rx antenna patch on same substrate. on top they both have to be on same plane, trying to...
There is something called a stripline circulator. its may also be called a planar circulator. There is a book i found in Google on strip line circulators. try getting hold of it.. and as for the example, u can find some circulator examples in CST..!!
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