Multi-band Planar Antenna via Merged PCB Resonators
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Solution Overview
Problem
Current planar antennas have limited frequency bands, complex structures, and high fabrication costs, making them unsuitable for both WiFi LAN and WiMAX MAN applications, with a need for a compact, low-cost, and multi-frequency band solution.
Innovation Solution
A multiple frequency band planar antenna design featuring first and second antenna patterns on a circuit board, with specific elongated and conductor portions connected to a ground pattern and a feeding transmission line, forming resonant structures that operate at frequencies suitable for both WiFi LAN and WiMAX MAN, including central frequencies at 2.45 GHz, 5.28 GHz, and additional frequencies up to 5.8 GHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a laminate pattern antenna with inverted-F-shaped and inverted-L-shaped patterns is used to achieve wider frequency band operation, then the frequency band is widened, but the structure becomes complicated and fabrication cost increases
Solution Approach 1:
The patent merges the driven element and passive element into a single integrated planar antenna structure on one surface of the PCB. The antenna consists of a driven element with a feeding portion and a passive element connected to the driven element, forming a unified structure that achieves wide frequency band operation (2.4 GHz to 5.8 GHz) without requiring complex lamination processes.
Solution Approach 2:
The planar antenna structure is designed to perform multiple functions simultaneously: it serves as both the driven element and passive element for wideband operation, and can be integrated with the PCB ground pattern. The antenna operates across multiple frequency bands (2.4 GHz WiFi, 3.5 GHz, 5.2 GHz, and 5.8 GHz) using a single structure, eliminating the need for separate antenna components.
2Adaptability or versatility
If a laminate pattern antenna with multiple patterns is fabricated, then the frequency band is widened, but the fabricating procedures become lengthy and cost increases
Solution Approach 1:
The patent combines all antenna patterns into a single planar structure that can be fabricated using standard PCB printing processes. The driven element and passive element are formed as conductive traces on the same PCB surface, eliminating the need for separate lamination steps and reducing fabrication complexity while maintaining wide frequency band operation.
Solution Approach 2:
The patent optimizes the geometric parameters of the planar antenna structure, including the path length of the driven element, the configuration of the passive element, and the positioning of the feeding portion, to achieve wide frequency band operation (2.4 GHz to 5.8 GHz) using simple single-side PCB fabrication processes.
3Device complexity
If a planar antenna is designed for compactness and low cost, then integration with PCB is achieved, but the frequency band becomes narrow
Solution Approach 1:
The patent merges the driven element and passive element into a single integrated planar antenna structure on one surface of the PCB. The antenna consists of a driven element with a feeding portion and a passive element connected to the driven element, forming a unified structure that achieves wide frequency band operation (2.4 GHz to 5.8 GHz) without requiring complex lamination processes.
Solution Approach 2:
The patent utilizes the two-dimensional surface of the PCB effectively by designing the driven element and passive element in specific geometric configurations. The driven element includes a feeding portion and extends in a particular pattern, while the passive element is positioned and shaped to create resonant structures that operate across multiple frequency bands, achieving wide bandwidth within the constrained planar geometry.
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 operation across multiple frequency bands, enabling simultaneous use in WiFi LAN and WiMAX MAN, with a simplified structure and reduced fabrication costs, enhancing wireless internet access capacity and range in metropolitan areas.
Implementation Method 1
the first antenna pattern forms a first resonant structure that serves as a quarter-wavelength monopole antenna... the first antenna pattern, the second antenna pattern, the connecting portion as well as the ground pattern form a second resonant structure that serves as a loop antenna
Data Source
AI summary
A multiple frequency band planar antenna formed on one-side surface of a circuit board comprises: a first antenna pattern, a second antenna pattern, a third antenna pattern and a fourth antenna pattern, each antenna pattern further comprising an elongated portion and a conductor portion; wherein the second elongated portion at a point between its two ends is short-circuited to a feeding transmission line formed on another-side surface of the circuit board through a via. Thus, the multiple frequency band planar antenna can operate at three frequency bands with their central frequencies at 2.4 GHz, 3.5 GHz and 5.8 GHz, respectively, suitable for both WIFi LAN and WiMAX MAN applications.