Surface-Mount Multi-Band Antenna with 3D Radiator Arrangement
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Solution Overview
Problem
Existing multi-band antennas, such as PIFA structures, face challenges in achieving compact size and satisfactory signal quality due to their specific size requirements and need for internal space in portable electronic devices, making it difficult to accommodate them in lightweight and compact designs.
Innovation Solution
A surface-mount multi-band antenna with metal patterns on a ceramic carrier, featuring a unique arrangement of rectangular and stripe regions for signal feeding and radiation, and a ground point, allowing for direct surface mounting on a circuit board with enhanced matching and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PIFA structure is used for multi-band antenna, then signal quality can be maintained, but the antenna requires specific size and internal space which conflicts with compact portable device requirements
Solution Approach 1:
The patent transitions from traditional 2D planar PIFA structures to a 3D立体 configuration by arranging radiator elements on multiple faces (front, back, top, bottom) of a substrate. This spatial distribution enables compact footprint while maintaining the electrical length and resonance characteristics needed for multi-band operation, resolving the contradiction between small size and signal quality.
Solution Approach 2:
The antenna design embeds multiple functional elements (radiators, ground points, feeding points) within a compact three-dimensional substrate structure. The first, second, and third radiators are positioned on different faces of the same substrate, effectively nesting multiple antenna functions into a single compact volume, thereby achieving both small size and reliable multi-band performance.
2Adaptability or versatility
If PIFA structure is used for multi-band antenna, then multi-band signal transmission can be achieved, but the device complexity increases due to specific structural requirements and accommodation space needs
Solution Approach 1:
The substrate serves multiple functions simultaneously: it acts as the antenna radiator, the mounting base for surface attachment, the structural support, and the positioning reference for ground and feeding points. This multi-functionality eliminates the need for separate components and complex assembly, reducing device complexity while maintaining multi-band transmission capability.
Solution Approach 2:
The patent combines the radiator elements, ground points, and feeding points into a single integrated substrate structure. The first, second, and third radiators along with their associated ground and feeding points are all mounted on the same substrate, merging what would traditionally be separate components into one unified assembly, thereby simplifying the overall device structure.
3Volume of moving object
If compact size is achieved for portable devices, then portability is improved, but there is insufficient internal space to accommodate traditional multi-band antenna structures
Solution Approach 1:
By utilizing three-dimensional space on all six faces of the substrate (front, back, top, bottom, and side faces), the antenna achieves compact footprint without sacrificing functional space. This allows the antenna to maintain multi-band capability while occupying minimal device volume, enabling portability without compromising antenna performance.
Solution Approach 2:
The antenna structure is divided into multiple independent radiator elements (first, second, and third radiators) positioned on different faces of the substrate. Each radiator can be independently optimized for specific frequency bands, allowing compact overall size while maintaining multi-band functionality through distributed segmentation rather than requiring large continuous space.
Data Source
AI summary
A surface-mount multi-band antenna includes a carrier, a first radiator, a second radiator, and a third radiator. The first radiator, the second radiator and the third radiator are respectively arranged on faces of the carrier. The first radiator includes a first rectangular region and a second rectangular region arranged on the bottom face of the carrier. The second radiator includes a third rectangular region and a fourth rectangular region on the bottom face. The second rectangular region has an opened area on the surface of the bottom face to provide coupling effect to increase bandwidth. One end of the fourth rectangular region forms a ground point and has a separation of 0.75 mm with the second rectangular region to provide matching. The fourth rectangular region has a length of 9.9 mm to add one more mode.