Integrated Antenna Device for Compact Electronic Apparatus
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Solution Overview
Problem
In electronic apparatuses, the miniaturization and sophistication lead to challenges in arranging matching circuits and transmission lines, causing losses and degrading antenna characteristics due to long connection lengths and stray capacitance between conductive patterns and connecting members like spring pins.
Innovation Solution
An antenna device with an integrated substrate housing the antenna unit, matching circuit unit, transmission line unit, and connecting portion, where at least one of the units includes a ground conductor for stabilization and shielding, eliminating the need for external connecting members and allowing flexible placement to reduce noise radiation and improve impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the antenna is connected to the circuit board by a spring pin or connecting member, then the antenna can be mounted on the housing, but loss increases and impedance matching becomes difficult due to long connection length
Solution Approach 1:
The patent merges the antenna, matching circuit, and transmission line into a single integrated antenna device mounted on the housing. This eliminates the need for separate connecting members like spring pins, thereby reducing connection loss and improving energy efficiency while maintaining ease of manufacture through integrated construction.
2Ease of manufacture
If the antenna is connected to the circuit board by a spring pin, then connection is achieved, but impedance matching becomes difficult due to long line length
Solution Approach 1:
The antenna, matching circuit, and transmission line are merged into a single integrated unit with short internal connections. This integration maintains manufacturing simplicity while achieving precise impedance matching through optimized internal layout and reduced connection length.
3Area of stationary object
If the conductive pattern and connecting member are placed close to each other, then space is saved, but stray capacitance is formed degrading antenna characteristics
Solution Approach 1:
The antenna conductive pattern and transmission line are merged into a single integrated structure with optimized spacing. This integration allows efficient space utilization while controlling stray capacitance through designed geometric relationships and insulation, thereby maintaining reliable antenna characteristics.
4Area of stationary object
If matching circuit and transmission line are mounted on small circuit board, then space is saved, but design freedom is reduced and arrangement becomes difficult
Solution Approach 1:
The matching circuit and transmission line are merged with the antenna into a single integrated device that can be flexibly mounted on the housing. This integration maintains compact space utilization while providing extensive design freedom through various mounting positions and configurations on the housing surface.
5Loss of energy
If components are integrated into a single substrate, then loss is reduced and mounting is simplified, but space for arrangement becomes constrained
Solution Approach 1:
The integrated antenna device is designed to utilize the housing's three-dimensional space by mounting on the housing surface rather than being confined to the circuit board plane. This dimensional transition allows compact integration with reduced loss while efficiently utilizing available space through vertical and surface arrangement.
Data Source
AI summary
An electronic apparatus includes an antenna device, a circuit board, and a housing containing the antenna device and the circuit board. The inner surface of the housing is spaced apart from the circuit board. The antenna device includes an antenna unit, a matching circuit unit connected to the antenna unit, a transmission line unit connected to the matching circuit unit, and a connecting portion included in the transmission line unit. The antenna device is disposed along the inner surface of the housing. The connecting portion is connected to a circuit of the circuit board. The antenna device includes a ground connection portion in the matching circuit unit in a region where the antenna device is disposed along the inner surface of the housing. The ground connection portion electrically connects a second ground conductor of the antenna device to a first ground conductor on the housing.