Multi-Loop Antenna System for Compact WLAN Integration
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Solution Overview
Problem
Existing array antennas, particularly concurrent dual-band array antennas, face challenges in integration and signal feeding, making it difficult to replace them without adapting the entire system module, and they are not suitable for compact, high-gain, high-radiation directivity applications in WLAN frequency bands.
Innovation Solution
A multi-loop antenna system with first and second loop antennas on a substrate, each operable in different frequency bands, using signal-feed and grounding portions to form loops, allowing for concurrent operation and integration in a compact, low-profile design suitable for WLAN frequencies, with a system module serving as a reflector for enhanced directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If array antenna dimensions are determined by half-wavelength resonance, then resonant performance is achieved, but antenna size becomes large and integration of multiple radiator units becomes difficult
Solution Approach 1:
The patent divides the antenna system into multiple independent loop antennas, each operating at different frequency bands. Instead of using a large array of half-wavelength resonant elements, the invention segments the frequency spectrum and assigns dedicated loop antennas to each band, thereby reducing overall antenna volume while maintaining resonant performance in each band.
Solution Approach 2:
The patent transitions from planar array configurations to a three-dimensional stacked architecture where loop antennas are arranged vertically at different heights above the ground plane. This dimensional change allows multiple frequency bands to be accommodated in a compact vertical space rather than requiring large horizontal expansion.
2Reliability
If probe pin feeding is used for array antennas, then signal transmission is achieved, but circuit layout complexity increases and system module replacement becomes necessary
Solution Approach 1:
The patent extracts the feeding mechanism from the traditional probe pin approach and implements microstrip line feeding integrated directly into the substrate. This extraction eliminates the need for separate probe pins and their associated complex circuit layouts, simplifying the overall system design and allowing independent antenna module replacement.
Solution Approach 2:
The patent merges the feeding network with the antenna substrate by using microstrip lines that are directly patterned on the same substrate as the loop antennas. This integration combines what were previously separate components (feeding network and radiating elements) into a unified structure, reducing circuit layout complexity.
3Reliability
If multiple array radiator units are integrated, then coverage is improved, but antenna profile height increases
Solution Approach 1:
The patent implements a nested configuration where loop antennas are positioned at different vertical levels above the ground plane, with each loop nested within the vertical space defined by the others. This nesting allows multiple frequency bands to be accommodated in a compact vertical profile without requiring proportional increases in height.
Solution Approach 2:
The patent utilizes the vertical dimension above the ground plane to accommodate multiple loop antennas at different heights, rather than expanding horizontally or increasing overall profile height proportionally. This dimensional arrangement provides frequency diversity and coverage while maintaining a low-profile configuration.
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 multi-loop antenna system achieves high gain and radiation directivity in WLAN frequency bands, enabling compact and efficient integration in electronic devices like wireless access points, with improved signal isolation and reflection coefficients, and low spatial occupancy.
Implementation Method 1
a first loop antenna disposed on the first surface of the substrate, operable in a first frequency band... and a second loop antenna disposed on one of the first and second surfaces of the substrate, operable in a second frequency band
Implementation Method 2
with a system module serving as a reflector for enhanced directivity
Data Source
AI summary
A multi-loop antenna system includes a substrate having opposite first and second surfaces, a first loop antenna disposed on the first surface, and a second loop antenna disposed on one of the first and second surfaces. Each of the first and second loop antennas is operable in a corresponding one of first and second frequency bands, and includes a signal-feed portion and a grounding portion that are disposed adjacent to each other and that are disposed proximate to a respective one of peripheral edges of the substrate, and a radiator portion that has opposite ends connected electrically and respectively to the signal-feed and grounding portions and that cooperates therewith to form a loop.