Compact VHF/UHF Ultrawideband Discone Antenna with Consistent Pattern

Area of Science:

• Electrical Engineering
• Electromagnetics
• Antenna Theory

Background:

• Ultrawideband (UWB) antennas are crucial for modern wireless communication systems.
• Discone antennas offer broad bandwidth but often face challenges with pattern consistency and size.
• Existing UWB antenna designs require optimization for specific applications like in-vehicle systems.

Purpose of the Study:

• To propose a compact VHF/UHF ultrawideband discone antenna with consistent radiation patterns.
• To enhance antenna performance by addressing radiation angular distortion and suppressing higher-order modes.
• To achieve broadband operation and profile reduction for practical applications.

Main Methods:

• Design and integration of a disk, modified cone, inverted cone, four shorting probes, and two sleeves.
• Insertion of sleeves to improve radiation angular distortion at high frequencies.
• Utilizing an inverted cone and shorting probes for broadband performance and size reduction.

Main Results:

• Achieved an 11.36:1 bandwidth with consistent radiation patterns.
• Improved pattern nulls by 26.1 dB.
• The antenna occupies a compact cylindrical volume of 0.227 λ0 (Diameter) and 0.096 λ0 (Height).

Conclusions:

• The proposed discone antenna offers a competitive solution for UWB applications.
• The design successfully achieves consistent patterns and broadband performance in a compact form factor.
• This antenna is well-suited for future in-vehicle communication systems due to its performance and size.