Multi-band Window Antenna with Embedded Wires
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Solution Overview
Problem
Concealed vehicle antennas are limited to single or dual band frequencies, leading to visibility issues and increased cost with multiple antennas for diverse frequency bands, and are prone to electromagnetic interference and fading effects.
Innovation Solution
An embedded wire antenna system with multiple monopole wires, where each wire is tuned to a specific frequency band, and additional wires are electromagnetically coupled to enhance multiband performance, minimizing visibility and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate antennas are used for diverse frequency bands, then reception quality across multiple bands is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple antenna functions into a single integrated antenna structure embedded in the windshield. The antenna uses multiple conductive elements (first antenna element, second antenna element, third antenna element) that operate across multiple frequency bands (FM, DAB, TV) simultaneously, eliminating the need for separate antennas for each band while maintaining reception quality.
Solution Approach 2:
The integrated antenna is designed to perform multiple functions across different frequency bands. The antenna structure includes elements tuned to resonate at different frequencies (e.g., first element for FM band, second element for DAB band, third element for TV band), allowing a single antenna system to serve multiple communication and reception purposes.
2Reliability
If antenna wire is located in the center portion of the glazing, then transmission and reception performance is improved, but visibility and aesthetic appearance deteriorate
Solution Approach 1:
The patent positions the antenna elements along the peripheral edge of the windshield rather than in the center, utilizing the boundary dimension. The first antenna element extends along the left edge, the second along the right edge, and the third along the top edge, distributing the antenna structure across the perimeter to maintain performance while improving aesthetic appearance by reducing central visibility.
3Reliability
If antenna wire is placed in the third visor area, then signal reception is improved, but electromagnetic interference from sensors increases
Solution Approach 1:
The patent extracts the antenna elements from the problematic third visor area where sensors are located and redistributes them along the peripheral edges of the windshield. This separation removes the antenna from the source of electromagnetic interference while maintaining signal reception capability through the distributed elemental structure.
4Ease of manufacture
If a single band antenna is used, then manufacturing simplicity is maintained, but adaptability to multiple frequency bands is limited
Solution Approach 1:
The patent segments the antenna into multiple conductive elements (first, second, and third antenna elements) with different geometries and resonant frequencies. Each element can be independently designed and manufactured for specific frequency bands, yet they work together as an integrated system, maintaining manufacturing simplicity while achieving multi-band adaptability.
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 system provides wideband performance across multiple frequency bands, reducing visibility and cost while mitigating interference, enabling diverse wireless communications and improved reception quality.
Implementation Method 1
additional wires are electromagnetically coupled to enhance multiband performance
Data Source
AI summary
A window antenna wherein three embedded wires are laminated inside a glazing and a connector is attached to the joint end of the first and second wires and a signal input. The second antenna wire is longer and resonates at a lower frequency than the first antenna wire. A third antenna wire is a parasitic L-shape wire with part of the wire in close distance to the open end of the second antenna wire. The third antenna wire is electromagnetically coupled to the second antenna wire in the near field so that the antenna may support an additional resonance to provide multiband and wideband performance.