The response plot is accessible from the “Response” tab in the tab bar. It represents the most up to date response of the coupling matrix belonging to the currently selected design. There’s support for plotting the magnitude and phase of S11 and S21 in addition to the transmission group delay. Depending on which parameter is currently visible each goal of that parameter is drawn on top of the response as a visual aid for tuning and optimization. Markers can be activated to further assist the designer.
The scale and range of all axes, left, right and frequency are adjusted by finger gestures. Pinch to zoom in and out at the location where you initiated the pinch-gesture. Pan to adjust the range of values shown on an axis with a pan-gesture. These gestures are accessible even while in the tuning mode.
It is also possible to autoscale an axis by double-tapping it. This operation will automatically scale an axis to fit the entire range of values currently available for that parameter. The frequency axis also supports autoscaling and will adjust the frequency range appropriately. This is especially useful when your response has disappeared from radar.
Selecting parameters to plot and enabling markers
Tap the “Options” button in the top-left corner. A view will pop up that gives you the opportunity to enable markers and select which parameter to plot on the left and right axis. One can choose between the magnitude and phase of S11 and S21 in addition to the transmission group delay. After completing the options dialog by tapping “Done” an autoscale is applied to all axes.
A useful tip when one has to keep track of both the overall and detailed features in the response. Toggle the same parameter on both axes, left and right. This way you’ll be able to catch, for instance, the rejection performance and the passband ripple at once in the same S21 plot.
Markers gives the designer access to detailed information at a specific frequency. Tap and drag the marker number to a location in the plot of interest. The delta is automatically calculated and displayed in the markers info-window, useful for quickly obtaining the relative rejection between the passband and an arbitrary frequency outside the passband.
Back to the Couplings Designer reference material.