Design of a Novel Wideband Leaf-Shaped Printed Dipole Array Antenna Using a Parasitic Loop for High-Power Jamming...

Area of Science:

• Electrical Engineering
• Antenna Theory
• Electromagnetics

Background:

• Wideband antenna sensors are crucial for high-power jamming applications.
• Existing designs often face limitations in impedance matching and bandwidth.

Purpose of the Study:

• To propose and validate a novel wideband leaf-shaped printed dipole antenna sensor.
• To enhance impedance matching bandwidth characteristics for high-power jamming.

Main Methods:

• Design of a leaf-shaped dipole radiator with exponential curves for directive patterns.
• Integration of matching posts, rectangular slots, and a parasitic loop element for improved impedance matching.
• Fabrication on TLY-5 substrate for high-power durability.
• Extension to an 11 × 1 uniform linear array to evaluate array characteristics.

Main Results:

• Achieved a measured fractional bandwidth of 66.7% at a center frequency of 4.5 GHz.
• Demonstrated average active reflection coefficients (ARCs) of -13.4 dB (simulated) and -14.7 dB (measured) from 4.5 to 6 GHz.
• Measured bore-sight co-polarization gains of 13.4 dBi and 13.7 dBi at 4 GHz and 5 GHz.
• Attained maximum co-polarization gains of 12.2 dBi and 10.3 dBi at 4 GHz and 5 GHz, respectively, with beam steering at 15°.

Conclusions:

• The proposed leaf-shaped printed dipole antenna sensor effectively enhances impedance matching and bandwidth.
• The antenna design is suitable for high-power jamming applications due to its wideband characteristics and durability.
• The array configuration confirms stable beam steering capabilities and high gain performance.