Shared Aperture Folded Dipole Antenna With Inherent 50 Ω Matching
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Solution Overview
Problem
Existing shared aperture multi-band antennas are limited by large size, complex structure, and require specific design elements for impedance matching, making them unsuitable for miniaturized biomedical and 5G communication applications.
Innovation Solution
A shared aperture multi-band antenna design featuring a dielectric circuit board with a folded dipole microstrip antenna and pairs of parallel metallic patches, which allows for resonance in dual band frequency ranges without the need for specific impedance matching devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two independent antennas are placed in proximity to each other to realize dual or multi-band behavior, then frequency band coverage is improved, but the area occupied increases and aperture utilization efficiency decreases
Solution Approach 1:
The patent merges multiple antennas operating at different frequency bands into a single shared aperture structure. The common radiating topology integrates multiple antenna elements that can operate independently at different frequencies while occupying a unified physical space, thereby achieving dual or multi-band behavior without requiring separate antenna areas.
Solution Approach 2:
The shared aperture antenna structure is designed to serve multiple frequency bands simultaneously through a single unified structure. The common radiating elements can be excited at different frequencies to provide universal coverage across multiple bands, making the antenna system multi-functional rather than dedicated to a single frequency.
2Volume of moving object
If antenna size is miniaturized to integrate within small medical devices, then device compactness is improved, but radiation efficiency and bandwidth are reduced
Solution Approach 1:
The patent transitions from planar two-dimensional antenna structures to three-dimensional volumetric configurations. By utilizing vertical stacking and multi-layer arrangements, the antenna achieves enhanced radiation efficiency and bandwidth while maintaining a compact footprint. The third dimension provides additional space for current paths and resonant structures without increasing the planar area.
Solution Approach 2:
The patent employs composite material structures including dielectric resonators, metallic patches, and substrate integration to achieve miniaturization while maintaining performance. The combination of different materials with complementary electromagnetic properties enables compact antenna designs that overcome the limitations of electrically small antennas.
3Reliability
If conventional impedance matching networks are added to miniaturized antennas, then impedance matching is improved, but device complexity and loss increase
Solution Approach 1:
The patent designs the antenna structure itself to provide inherent impedance matching capabilities through its geometric configuration, material properties, and resonant characteristics. The antenna geometry is optimized to present the desired input impedance directly, eliminating the need for separate impedance matching networks and reducing overall system complexity.
Solution Approach 2:
The patent achieves impedance matching by adjusting antenna geometric parameters such as patch dimensions, gap sizes, and substrate properties. By optimizing these physical parameters during design, the antenna naturally achieves the desired 50-ohm impedance match without requiring additional matching components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The antenna achieves efficient resonance across sub-1 GHz and sub-6 GHz bands with a compact size, simplified structure, and impedance matching at 50 Ω, making it suitable for both biomedical and 5G applications.
Implementation Method 1
The shared aperture multi-band antenna is configured to resonate in a dual band frequency range comprising a first resonance band in a range of 0.4 GHz to 0.6 GHz and a second resonance band in a range of 4.7 GHz to 5.8 GHz
Data Source
AI summary
A shared aperture multi-band antenna is described. The antenna includes a dielectric circuit board, a folded dipole microstrip antenna, and a lumped inductor. The folded dipole microstrip antenna is formed on a top side of the dielectric circuit board. The microstrip antenna includes two meander paths. The two meander paths enclose a shared aperture therebetween. The lumped inductor is inserted across a first gap near the third edge. A first pair of parallel metallic patches, a second pair of parallel metallic patches, and a third pair of parallel metallic patches are located on the bottom side. The antenna resonates in a dual band frequency range comprising a first resonance band in a range of 0.4 GHz to 0.6 GHz and a second resonance band in a range of 4.7 GHz to 5.8 GHz upon application of an input signal at both a first feed port and a second feed port.