中文版本

Opportunity  

Antennas and bandpass filters are critical components in wireless communication systems, where size, efficiency, and performance are paramount. Traditional filtering antenna designs, which integrate antennas with bandpass filters using filter synthesis and coupling matrix theory, require multiple resonators, resulting in larger sizes and higher insertion losses. These limitations hinder their use in compact, high-performance applications such as 5G networks, satellite communications, and IoT devices. There is a growing need for antennas that combine filtering and radiating functions in a compact form factor, with reduced insertion loss and the flexibility to support both linear and circular polarization for diverse applications.

Technology  

This patent introduces a filtering dielectric resonator antenna (FDRA) that implements radiation cancellation to achieve integrated filtering and radiating functions. Key innovations include:

1. Dielectric Resonator (DR) Configuration: A dielectric resonator, made of high-permittivity material, is disposed on a ground plane and excited in the hybrid electromagnetic (HEM) mode (e.g., HEM₁₁δ) to produce a horizontal magnetic dipole.
2. Loop Feed Structure: A conductive loop assembly, partially penetrating the dielectric resonator, is coupled to a microstrip feed line. This structure generates a second horizontal magnetic dipole with a magnitude equal to and phase opposite to the DR’s dipole at frequencies outside the desired passband.
3. Radiation Cancellation: The combination of the DR’s and loop feed’s magnetic dipoles creates radiation nulls outside the passband, providing effective filtering without additional resonators.
4. Polarization Flexibility: The FDRA supports both linear polarization (LP) and circular polarization (CP), achieved through specific configurations of the dielectric resonator and loop feed structure, making it suitable for applications like satellite communications requiring CP to resist interference.
5. Compact Design: The single DR and integrated loop feed reduce the antenna’s footprint, with the substrate sized to match the ground plane, minimizing overall volume.
6. Validated Performance: Measured and simulated results confirm reflection coefficients, radiation patterns, axial ratios (for CP), and antenna gains, demonstrating low insertion loss and effective filtering.

The design eliminates the need for multiple resonators, achieving a compact, low-loss antenna with integrated filtering capabilities.

Advantages  

• Compact Size: Single dielectric resonator and loop feed structure minimize antenna volume.
• Low Insertion Loss: Radiation cancellation reduces losses compared to traditional multi-resonator designs.
• Effective Filtering: Radiation nulls outside the passband provide robust bandpass filtering.
• Polarization Versatility: Supports both linear and circular polarization for diverse applications.
• High Performance: Validated through simulations and measurements for reflection coefficients, radiation patterns, and gains.

Applications  

• 5G Networks: Compact antennas for base stations and mobile devices.
• Satellite Communications: Circularly polarized antennas for interference-resistant signal transmission.
• IoT Devices: Small, efficient antennas for smart sensors and connected devices.
• Wireless Consumer Electronics: Antennas for smartphones, tablets, and wearables.
• Radar Systems: High-performance antennas for precise signal processing.