Wireless Terminal Antenna Linkage RF Component Placement
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Solution Overview
Problem
Current wireless terminals face challenges in reducing volume while maintaining antenna sensitivity, and existing internal antennas like PIFAs and notch antennas do not efficiently utilize space for RF components, complicating manufacturing.
Innovation Solution
The solution involves placing RF components near the linkage part between the antenna and the substrate, raising the PCB ground to optimize antenna performance, and using a flexible PCB to integrate RF circuits and antenna structures, allowing for improved current distribution and reduced user interaction risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If internal antennas such as PIFAs and notch antennas are used to reduce terminal volume, then the antenna volume is reduced, but the space for RF components is insufficient and manufacturing becomes complicated
Solution Approach 1:
The patent combines the antenna structure with the PCB substrate by integrating the PIFA antenna directly onto the PCB ground plane. The antenna's radiating element and ground plane are formed as integrated structures on the same substrate, eliminating the need for separate antenna components and simplifying manufacturing processes while maintaining compact volume.
Solution Approach 2:
The PCB substrate serves multiple functions simultaneously: it acts as the structural support for the terminal, provides the ground plane for the antenna system, and serves as the mounting platform for RF components. This multi-functional integration reduces the number of separate components needed and simplifies the overall manufacturing process.
2Reliability
If RF components are placed far from the antenna to maintain signal integrity, then interference is reduced, but the terminal volume increases
Solution Approach 1:
The patent places RF components in specific local areas near the antenna feed point where electromagnetic coupling is most effective. By carefully selecting the precise location and orientation of components such as matching networks and filters adjacent to the antenna connection, the design achieves optimal signal integrity while maintaining compact dimensions.
3Length of stationary object
If the PCB ground plane is lowered to reduce terminal height, then the terminal becomes more compact, but antenna resonance frequency and bandwidth are affected
Solution Approach 1:
The patent optimizes the PCB ground plane thickness and antenna element dimensions to achieve the desired resonance frequency and bandwidth characteristics. By carefully adjusting parameters such as the ground plane thickness, antenna radiating element length and width, and the position of shorting pins, the design maintains optimal antenna performance while achieving compact terminal height.
Data Source
AI summary
A wireless terminal is described, which is formed from a module (20) comprising a substrate, RF components (32, 33), an antenna (25), notably of the PIFA type, and a linkage part (30) for linking the antenna to the substrate. The RF components are placed in the vicinity of the linkage part or even on the linkage part without degrading the operation of the antenna. By placing the RF components on this link, an area is made available for circuitry on the substrate.