Antenna Module Band-Stop Filter Interference Reduction
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Solution Overview
Problem
Existing antenna systems with multiple elements in close proximity suffer from mutual interference in their radiating patterns, complicating design and introducing frequency characteristic variances due to additional components and complex assembly steps.
Innovation Solution
Incorporating band-stop filter structures near the first antenna element, with planar conductive elements arranged in meander patterns and connected to radiating elements to attenuate current flow in the second frequency band, reducing interference effects on the second antenna element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple antenna elements are arranged in close proximity to share housing, base, PCB circuitry and electric connections, then structural advantages and component sharing are achieved, but mutual interference effects occur between the antenna elements regarding their radiating patterns
Solution Approach 1:
A frequency selective surface is introduced as an intermediary component between the first and second antenna elements. This surface acts as a mediator that allows radio frequency energy to pass through at the first frequency range while reflecting energy at the second frequency range, thereby reducing mutual interference between the closely spaced antenna elements without requiring them to be physically separated
2Object-affected harmful factors
If frequency selective surfaces are incorporated to reduce mutual interference between antenna elements operating in different frequency ranges, then interference effects are reduced, but the design and manufacturing complexity increases
Solution Approach 1:
The frequency selective surface is designed to serve multiple functions simultaneously: it acts as an interference reduction mechanism between antenna elements, provides structural support as part of the housing or base, and can serve as a mounting surface for other components. This multi-functionality reduces the need for additional separate components and simplifies the overall design
3Ease of manufacture
If antenna elements are arranged in near-field to share structural components, then mechanical and electrical component sharing is achieved, but unacceptable variances are introduced to frequency characteristics due to additional components and complex assembly
Solution Approach 1:
The electrical length of the radiating elements is specifically adjusted to account for the presence of the frequency selective surface and other shared components. By changing the electrical length parameter, the antenna elements are tuned to achieve accurate frequency characteristics despite the modified electromagnetic environment created by component sharing arrangements
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 solution effectively reduces interference between the radiating patterns of the antenna elements, simplifying the design and maintaining frequency characteristics by using band-stop filter structures to suppress current flow at specific frequencies, thereby minimizing near-field interference.
Implementation Method 1
The at least one band-stop filter structure is configured to attenuate a current flow at a frequency in the second frequency band
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The invention relates to an improved antenna system and antenna module incorporating same. The antenna system comprises: a first antenna element adapted to a first frequency band; and a second antenna element adapted to a second frequency band which is different from the first frequency band. The first antenna element includes: a radiating structure comprising at least one planar radiating element, where the radiating structure is configured to radiate at a frequency in the first frequency band. The first antenna element further includes: at least one band-stop filter structure comprising at least one planar conductive element, where the at least one band-stop filter structure is configured to attenuate a current flow at a frequency in the second frequency band.