Resonant Cap Loaded Patch Antenna for Directivity and Bandwidth
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Solution Overview
Problem
Conventional antenna systems face challenges in optimizing antenna array requirements such as Half Power Beam Width (HPBW), antenna gain, and side lobe suppression due to mechanical constraints, while also considering cost and complexity.
Innovation Solution
A high-gain radiating patch antenna structure featuring a planar radiating element, a ground plane, and a resonant cap with dielectric sheet and conductive parasitic patches positioned at specific angles and spacings to enhance directivity and frequency bandwidth, allowing for improved amplitude weighting and sidelobe suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional antenna radiating element designs are used, then mechanical constraints are simpler, but frequency bandwidth, pattern beamwidth and polarization requirements cannot be achieved
Solution Approach 1:
The antenna structure is segmented into multiple functional layers: a radiating patch element, a dielectric substrate, and a resonant cap with parasitic patches. Each layer performs a specific function, allowing independent optimization of frequency bandwidth, beamwidth, and polarization characteristics without compromising mechanical simplicity
Solution Approach 2:
The invention adds a vertical dimension by stacking the resonant cap above the radiating element at a specific spacing (one-half wavelength). This three-dimensional configuration enables control of radiation patterns and impedance matching that cannot be achieved with planar designs alone, achieving multiple performance requirements simultaneously
2Measurement precision
If antenna array requirements are optimized for HPBW and gain, then radiation performance improves, but side lobe suppression and FIB ratio deteriorate
Solution Approach 1:
The resonant cap incorporates parasitic patches with specific local geometries and orientations (at angles between 20-35 degrees from vertical) that create localized electromagnetic fields. These localized field distributions selectively enhance the main beam while suppressing side lobes, achieving both high gain and low side lobe levels through spatially varying electromagnetic properties
Solution Approach 2:
The parasitic patches are configured at asymmetric angles (20-35 degrees from the vertical axis) rather than symmetric orientations. This asymmetric configuration creates directional electromagnetic coupling that shapes the radiation pattern to suppress side lobes while maintaining main beam integrity, resolving the trade-off between gain and side lobe suppression
3Measurement precision
If resonant cap with parasitic patches is added, then directivity improves by over 5 dB, but manufacturing complexity increases
Solution Approach 1:
The resonant cap integrates multiple functions into a single component: the dielectric sheet provides mechanical support and electromagnetic coupling, while the conductive resonant patch and parasitic patches are formed on the same substrate. This merging of functions into unified structures simplifies manufacturing compared to assembling multiple separate components, despite the increased structural complexity
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 solution significantly reduces HPBW and improves directivity by over 5 dB, achieving better antenna performance without undesirable tradeoffs in cost and complexity.
Implementation Method 1
a resonant cap configured above and spaced apart from the generally planar radiating element in a radiating direction. The resonant cap comprises a dielectric sheet, a conductive resonant patch configured on the dielectric sheet
Implementation Method 2
The resonant cap comprises a dielectric sheet, a conductive resonant patch configured on the dielectric sheet, and a plurality of conductive parasitic patches configured on the same or a different dielectric sheet
Data Source
AI summary
An antenna architecture containing a broadband resonant cap positioned over a radiating patch is disclosed. The resonant cap consists of a rectangular resonant patch at the center with parasitic patches in close proximity of the four edges of the resonant patch. The parasitic patches may be coplanar with the resonant patch or may be mounted at an angle with respect to the vertical axis of the resonant patch. The resonant cap reduces the HPBW of the emitted radiation and improves emission directivity.