Parasitic Element Antenna Isolation via Signal Redirection
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Solution Overview
Problem
Designing multiple antennas in a limited space to achieve optimal antenna isolation, efficiency, and bandwidth is challenging, especially in miniature wireless communication devices where interference and broadband requirements are critical.
Innovation Solution
The use of a radio-frequency device with a shared grounding element and parasitic elements between multiple antennas, where the parasitic elements guide reflected signals to enhance isolation, and a metal coupling piece facilitates signal emission and coupling, allowing for efficient operation of multiple antennas on the same frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple antennas are disposed in a limited space, then antenna isolation is improved, but antenna interference increases
Solution Approach 1:
The patent introduces parasitic elements as intermediary components between the antennas. These parasitic elements are positioned strategically to intercept and redirect reflected signals that would otherwise cause interference between antennas. The parasitic elements act as mediators that manage the electromagnetic field interactions, allowing multiple antennas to operate in close proximity while maintaining isolation.
Solution Approach 2:
The patent extracts the harmful reflected signals from the main antenna radiation paths by using parasitic elements to capture and redirect these signals. By taking out the interfering reflected components and directing them to parasitic elements, the main antennas can operate with reduced mutual interference even in limited space.
2Adaptability or versatility
If antenna elements are made longer to broaden bandwidth, then bandwidth is improved, but antenna size increases
Solution Approach 1:
The patent employs nested structures where parasitic elements are positioned within or alongside the main antenna elements. This nesting allows the system to achieve broader bandwidth characteristics through the combined resonance of multiple elements at different frequencies, without requiring the main antenna elements to be excessively long. The nested parasitic elements add frequency diversity while maintaining compact overall dimensions.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of parasitic elements around the main antennas. By distributing parasitic elements in different spatial dimensions and orientations, the system achieves broadband performance through multiple resonance modes without increasing the planar footprint or requiring excessively long linear elements. This dimensional approach allows bandwidth expansion in a compact volume.
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
This configuration improves antenna isolation and efficiency, enabling multiple antennas to operate simultaneously with reduced interference and broad bandwidth, meeting the requirements of modern wireless communication systems.
Implementation Method 1
The second parasitic element is used for guiding a first reflected signal generated from the first antenna to the second parasitic element so as to enhance isolations of the first antenna, the second antenna and the third antenna
Implementation Method 2
a first signal feed-in element, electrically connected to the metal coupling piece for coupling the first radio signal to the first radiating element via the metal coupling piece
Data Source
AI summary
A radio-frequency device includes a grounding element, a first antenna including a first parasitic element, a second antenna, a third antenna and a second parasitic element, wherein the grounding element is shared by the first, second and third antennas, the second parasitic element is electrically connected to the grounding element for guiding a first reflected signal from the first antenna to the second parasitic element, and the first parasitic element is electrically connected to the grounding element for guiding a second and third reflected signals from the second and third antennas to the first parasitic element, so as to enhance isolations of the first, second and third antennas.