A High-Performance, Low-Cost, and Integrated Hairpin Topology RF Switched Filter Bank for Radar Applications

Area of Science:

• Electrical Engineering
• Microwave Engineering
• Signal Processing

Background:

• Switched filter banks are crucial for frequency-agile systems like radar and communications.
• High filter isolation is essential for systems operating across multiple frequencies.
• Existing solutions may lack the required switching speed or isolation.

Purpose of the Study:

• To design and implement a highly isolated, switchable narrow-bandpass filter bank architecture.
• To achieve nanosecond switching speeds for rapid channel selection.
• To enhance filter bank practicality and frequency switching for radar applications.

Main Methods:

• Utilized hairpin microstrip topology for filter design.
• Integrated low-loss, highly isolated Single Pole Four Throw (SP4T) switches.
• Employed Advanced Design System (ADS) software for design and simulation.
• Validated performance using a Vector Network Analyzer (VNA).

Main Results:

• Developed a four-filter bank covering the radar S-frequency band (2.0-4.0 GHz).
• Achieved high isolation between discrete passbands (2.0-2.2 GHz, 2.3-2.5 GHz, 3.1-3.3 GHz, 3.9-4.1 GHz).
• Demonstrated nanosecond switching speeds.
• Confirmed ease of implementation and frequency switching.

Conclusions:

• The proposed hairpin microstrip filter bank architecture offers a practical solution for radar receivers.
• The design provides high isolation and fast switching capabilities.
• This advancement facilitates efficient operation in multi-frequency radar systems.