Multiband Planar Antenna Resonance via Segmented Elements
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Solution Overview
Problem
Conventional single band planar antennas are inadequate for wireless communication systems that require multiple resonance frequency bands, as they can only resonate at a single frequency determined by the length of their flat plates.
Innovation Solution
A multiband planar antenna design that includes antenna elements with different lengths and clearances, allowing resonance at multiple frequency bands by adjusting the lengths of these elements and clearances to correspond to specific wavelengths, thereby enabling operation across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single band planar antenna is used with flat plates of uniform length, then the antenna structure is simple and easy to manufacture, but it can only resonate at one frequency and cannot support multiple wireless communication bands
Solution Approach 1:
The antenna element is divided into multiple sides (first side, second side, third side, fourth side) with different lengths. Each side acts as an independent resonating segment that can support different frequency bands, transforming a single-frequency antenna into a multiband antenna through spatial segmentation of the conducting path.
Solution Approach 2:
Different sides of the antenna element are assigned different lengths (L1, L2, L3, L4) to create local variations in electrical characteristics. This allows each segment to resonate at different frequencies, enabling the antenna to handle multiple wireless communication bands simultaneously while maintaining a planar structure.
2Adaptability or versatility
If antenna elements of different lengths are introduced to achieve multiband resonance, then multiple frequency bands can be supported, but the antenna design becomes more complex
Solution Approach 1:
Multiple antenna elements with different lengths are integrated into a single planar antenna structure. The first and second antenna elements face each other with a first clearance, while the third and fourth antenna elements face each other with a second clearance. This merging approach allows multiband functionality to be achieved within a unified antenna assembly, simplifying manufacturing compared to using separate antennas for each band.
3Measurement precision
If clearances between antenna elements are adjusted to optimize resonance frequencies, then precise frequency control is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The resonance frequencies are controlled by adjusting geometric parameters of the antenna elements, specifically the lengths L1, L2, L3, L4 of the four sides and the clearances between opposing elements. By changing these dimensional parameters, the resonance frequencies can be precisely tuned to match required wireless communication bands, achieving accurate frequency control through geometric parameter optimization.
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 multiband planar antenna effectively resonates at multiple frequency bands, enhancing its compatibility with various wireless communication systems, such as GPS and mobile communication systems, by achieving resonance at specific frequencies like 1.57 GHz and 1.9 GHz, and allowing for impedance adjustments to optimize performance.
Implementation Method 1
a first resonance frequency corresponding to a length L1 of the first and third antenna elements in the extending direction, a second resonance frequency corresponding to a length L2 of a first clearance, and a third resonance frequency corresponding to a length L3 of a second clearance
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Disclosed is a multiband planar antenna including: an insulating film (31, a first antenna section (33) and a second antenna section (34) facing to the first antenna section across a feeding point (P) on a film, wherein the first antenna section includes: a first antenna element (331) including a side having a length in an extending direction corresponds to a first resonance frequency; a shorter second antenna element (332) at a predetermined distance from and in parallel with the first antenna element; and a first coupling section (333) to couple the first and second antenna elements, wherein a length in the extending direction of a first clearance (35) corresponds to a resonance frequency higher than the first resonance frequency, and wherein the second antenna section includes: third and fourth antenna elements (341,342) ; a second coupling section (343); and a second clearance similar to the above.