Compact Wideband Antenna Using Nested Monopole and Patch Elements
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Solution Overview
Problem
Designing ultra-wideband antennas for small portable communication devices like mobile handsets is challenging due to size restrictions, as existing solutions often result in narrow bandwidth and low radiation efficiency, and are costly to manufacture.
Innovation Solution
A compact wideband antenna design featuring a monopole and patch radiating element on a substrate with a cutout, where the patch antenna is shorted to the grounding metallization and inductively coupled with the monopole, allowing for a smaller footprint and efficient radiation across 3-7 GHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional wideband antenna designs are used, then bandwidth requirements are met, but antenna size becomes too large for mobile handsets
Solution Approach 1:
The monopole antenna is positioned to overlie the patch antenna, creating a nested configuration where one antenna structure is embedded within the spatial envelope of the other. This nesting allows both antennas to occupy overlapping footprints, dramatically reducing the total area required while maintaining both UWB and ISM band functionality
Solution Approach 2:
The invention transitions from planar antenna layouts to a three-dimensional configuration by stacking the monopole and patch antennas vertically. The monopole extends in the vertical dimension above the patch antenna, allowing both structures to coexist in a compact footprint by utilizing the height dimension rather than expanding laterally
2Area of moving object
If antenna size is reduced, then device integration is improved, but radiation efficiency deteriorates
Solution Approach 1:
The monopole and patch antennas are merged into a single integrated antenna system that operates across multiple bands. The combining of these two antenna types creates a unified structure that achieves wideband performance (3-10.5 GHz) while maintaining high radiation efficiency through constructive interference and complementary radiation patterns
Solution Approach 2:
The antenna system uses a composite configuration combining two different antenna architectures (monopole and patch) with distinct radiation characteristics. This composite approach allows the system to leverage the advantages of both types, achieving high efficiency across a wide frequency range despite the compact size
3Area of moving object
If compact antenna designs are implemented, then device integration is improved, but manufacturing complexity increases
Solution Approach 1:
The integrated antenna system performs multiple functions within a single structure: it provides both UWB (3.1-10.5 GHz) and ISM (2.4-2.48 GHz) band operation, eliminates the need for separate antenna elements, and simplifies the overall device architecture by consolidating what would traditionally require multiple discrete 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 design achieves a wideband antenna with a size reduction of about 70% compared to conventional solutions, maintaining high radiation efficiency and ease of manufacturing, suitable for various mobile handset configurations.
Implementation Method 1
The second antenna means is inductively coupled to the first antenna means for radiation in a second frequency band
Implementation Method 2
the patch radiating element is shorted to the grounding metallization
Data Source
AI summary
A substrate such as a printed wiring board defines a cutout of grounding metallization. A monopole radiating element is spaced laterally from edges of the grounding metallization in the cutout. A patch radiating element is spaced laterally from edges of the grounding metallization in the cutout. The monopole and patch radiating elements overlie at least a portion of one another to enable inductive coupling through an aperture characterized by the absence of grounding metallization, and the patch radiating element is shorted at a corner to the grounding metallization.