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High Bandwidth Circularly Polarized (CP) Patch Antenna

The US Navy seeks to commercialize an easy-to-implement circularly polarized microstrip antenna design that provides significantly higher bandwidth in retrofit or new constructs while maintaining device footprint and other important performance characteristics

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The Technology: 

The Naval Undersea Warfare Center Division Newport (NUWCDIVNPT) has developed and tested a novel approach that increased the bandwidth of a conventional microstrip patch antenna from a narrowband (~4% BW) to more broadband (~15%) antenna, This is done while also maintaining an axial ratio of < 3 dB over the passband. The key to this innovation is the use of three layers of high dielectric constant rods embedded in low dielectric constant spacers with the proper inter-layer spacing and rotation of the rods. This overall structure results in a CP patch antenna that increases the channel bandwidth from an existing antenna without increasing the footprint of the device while maintaining the desired polarization and other important performance characteristics. This invention is applicable for retrofits or incorporation into new systems.


• Wide bandwidth: Significant bandwidth improvement enables diverse, multiple capabilities from a single antenna (e.g., satellite telephone and GPS) and higher data transfer rates
• Easy to upgrade legacy devices: Robust, fault tolerant design offers excellent potential to easily retrofit and greatly improve performance and capabilities of existing patch antennas without substantial alteration to the device footprint
• Broadly applicable: Designed to retrofit an L-Band antenna; applicable to a wide swatch of frequencies and new systems
• Excellent performance: Other performance characteristics important to antennas, e.g., realized gain, are not compromised

The Opportunity: 

• US patent application filed for CP antenna; US 9281568 (bandwidth improvement of linearly polarized patch) also available for license
• Potential for collaboration with NUWC researchers