Feature 4: CAT Wideband Application

SynMatrix provides CAT with a proprietary algorithm that has excellent performance in both narrow band and wideband applications.

Our database includes the simulation and measurement data that can illustrate the capture capability that can support the filter application with fracture bandwidth maximum up to 50% (even with high frequency dispersive effect)

Example 1: 10 poles pure Chebyshev coaxial structure - 35% Fractional Bandwidth


Specifications: Filter order=10; f0=10Ghz; BW=3.5GHz; RL=22dB


Step 1: Input the filter specs and obtain the corresponded topology and coupling matrix.

As mentioned in the previous application feature, the frequency dispersive effect will impact the reactance slope resulting in asymmetrical performance. Additionally, the traditional resonance coupling equations will not be valid for wideband application; the traditional multiport extraction therefore is not able to extract the accurate frequency parameters that results in the wrong extracted coupling matrix.


Step 2: Single cavity analysis and coupling coefficient calculation. For more details, please refer to “Microwave Filter for Communication System”. Although the resonance coupling equations are not valid for wideband since the reactance slope is no longer linear, the user can still use these equations to obtain the preliminary response.


Step 3: Build the model and obtain the initial response


Step 4: Build the model and obtain the initial response.


Step 5: Start the iterated optimization procedure. Setup the “Dispersive Function” and re-calibrate the filter response to get better result.



Example 2: 11 poles pure Chebyshev coaxial structure— 50% Fractional BW


Specifications:Filter order=11; f0=3.35GHz; BW=1.7GHz; RL=21dB


Step 1: Input the filter specs and obtain the corresponded topology and coupling matrix.


Step 2: Build the model and obtain the initial response


Step 3:Start the iterated optimization procedures.