Vehicle Antenna Apparatus with Segmented Isolation
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Solution Overview
Problem
The increasing number of antennas in unified vehicle antennas leads to a decrease in isolation levels, complicating the accommodation of diverse frequency bands and specifications required for various communication and broadcasting services.
Innovation Solution
The antenna apparatus features a circuit board with multiple antennas, including AM/FM, DMB, 3G/4G, V2X, and satellite antennas, arranged on both the base and inner cover with distinct conductive patterns and feeding mechanisms to enhance isolation and accommodate various frequency bands, using flexible printed circuit boards and printed circuit boards for efficient signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of antennas is increased to accommodate diverse frequency bands and services, then the versatility and functionality are improved, but the isolation between antennas deteriorates
Solution Approach 1:
The patent divides the antenna system into multiple independent antenna elements (first antenna part and second antenna part) with distinct functional assignments. The first antenna part handles specific frequency bands while the second antenna part handles other bands, creating spatial and functional segmentation that maintains isolation while accommodating diversity.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by disposing antennas on different planes and orientations. The first antenna part is arranged in a first direction while the second antenna part is arranged in a second direction different from the first, creating spatial separation in multiple dimensions to maintain isolation between diverse antenna elements.
2Device complexity
If multiple antennas are disposed in close proximity, then the device complexity is reduced, but the isolation between antennas deteriorates
Solution Approach 1:
The patent assigns different local characteristics to different antenna regions. The first antenna part has specific conductive patterns optimized for its frequency band, while the second antenna part has different conductive patterns for its band. This local optimization allows compact integration while maintaining performance and isolation through direction-specific arrangements.
Solution Approach 2:
The patent implements a nested structure where the first antenna part and second antenna part are integrated within a unified antenna apparatus housing. The antennas are disposed in overlapping or adjacent spatial regions with careful positioning to achieve compact integration while maintaining necessary isolation through strategic orientation and spacing.
3Reliability
If antennas are arranged in different directions, then the isolation between antennas is improved, but the area occupied increases
Solution Approach 1:
The patent transitions from two-dimensional planar arrangement to three-dimensional spatial configuration. By disposing the first antenna part in a first direction and the second antenna part in a second direction different from the first, the patent utilizes vertical and angular dimensions to achieve isolation without proportionally increasing the footprint area.
Solution Approach 2:
The patent employs asymmetric arrangement where antenna elements are positioned at different angles and orientations rather than symmetrically. This asymmetric disposition allows optimization of isolation characteristics in critical directions while minimizing the overall bounding box area of the antenna apparatus.
Data Source
AI summary
An antenna apparatus includes a circuit board disposed on a base, a first antenna part disposed on the circuit board, an inner cover configured to cover the first antenna part, and a second antenna part disposed on a surface of the inner cover. A vehicle can utilize the antenna for communication.