Multi-Band Band-Pass Filter Design

This project involved the design and simulation of a multi-band band-pass filter operating at FM, DTV, and 5G frequency bands. Keysight ADS was used to design and optimize the filter using lumped components and microstrip transmission lines, with performance evaluated through S-parameters and Smith Chart analysis. 

Objectives

• Design a multi-band BPF operating at 100 MHz, 600 MHz, and 3.5 GHz.

• Achieve strong impedance matching and low reflection at all three target frequencies.

• Minimize insertion loss while maintaining effective multi-band filtering performance.

Outcomes & Contributions

• Achieved return losses (S₁₁) of −32.92 dB, −22.76 dB, and −22.11 dB at 100 MHz, 600 MHz, and 3.5 GHz.

• Achieved insertion losses of approximately 0.005 dB, 0.032 dB, and 0.138 dB, respectively.

• Developed a hybrid filter topology using lumped LC components and microstrip transmission lines.

• Verified impedance matching and frequency response using S-parameter and Smith Chart analysis.

Technical Details & Skills

• Technique: Multi-band BPF design, impedance matching, and S-parameter analysis

• Tools: Keysight ADS, S-Parameter Simulation, Smith Chart

• Skills: RF filter design, LC networks, microstrip transmission lines, impedance matching, S-parameter analysis

• Field: RF Systems, Microwave Engineering, Filter Design