AWR Datasheets

The EM simulation results in Figure 3 are shown in comparison to the circuit simulation results. The EM results were very similar to the circuit results and matched exactly the performance parameters with insertion loss in the frequency range of 8.4GHz to 9.3GHz with approximately 5dB and return loss well below12 dB. Figure 3: Comparison of circuit and EM simulation results (graph and table). Conclusion A straightforward AWR Design Environment software design flow for a miniature X-band edge-coupled microstrip bandpass filter has been demonstrated. The simulated results showed good filter response character- istics with passband insertion loss of approximately 5dB and return loss greater than 12dB in the 900MHz bandwidth with a center frequency of 9GHz. The validation results using AWR AXIEM EM simulation were in good agreement with the circuit simulation results based on the edge-coupled transmission-line models available in Microwave Office software. The performance of this BPF design at this frequency range is suitable for aerospace/ defense requirements for land, airborne, and naval radar applications. The final dimensions for the schematic design in the completed TX-LINE were W1 = 0.0121 in., W2 = 0.0124 in., W3 = 0.0124 in., and W4 = 0.0124 in. Figure 2 shows the integrated layout generation in AWR Microwave Office software, with the 2D representation on the left and the 3D representation on the right. Figure 2: Edge-coupled BPF layout. Circuit Simulation Results The circuit schematic was simulated in Microwave Office software based on the S-parameters. Figure 3 shows the results for insertion loss and return loss based on circuit analysis using the MACLIN asymmetric edge-coupled line models to define the filter network. The insertion loss in the frequency range of 8.4GHz to 9.3GHz was approxi- mately 5dB with return loss well below 12dB. It can also be seen from the S-parameter results that the roll-off transition between the passband and stopband is relatively sharp, thus avoiding interference from adjacent channels (stopband rejection). EM Simulation The AWR AXIEM planar method-of-moments (MoM) simulator within AWR Design Environment software was used to validate the BPF design. Once the EM simulations were carried out, the calculated current density can be annotated over the entire EM structure, which enables the designer to specify the frequency, phase, vector compo- nents, and color scaling associated with the magnitude of the current. It also supports the use of cut planes to enable designers to investigate current densities occurring within a more complex multi-layer structure through dissection of the PCB. Parameter Circuit Schematic Electromagnetic AXIEM Insertion Loss 1) 8.4GHz = -4.90dB 2) 9.3GHz = -4.92dB 1) 8.4GHz = 4.96dB 2) 9.3GHz = 4.98dB Return Loss 1) 8.4GHz = -13.27dB 2) 9.3GHz = -24.34dB 1) 8.4GHz = 19.45dB 2) 9.3GHz = 17.44dB 6 www.cadence.com/go/awr

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