Portable Device Antenna Merging PIFA and Loop Structures
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Solution Overview
Problem
Conventional antennas, such as loop antennas, are difficult to integrate into small and thin portable electronic devices with metallic exteriors due to efficiency reductions and interference, while planar inverted F antennas (PIFAs) are affected by metallic materials.
Innovation Solution
A portable electronic device design incorporating a housing with a substrate and radiation conductor, including a first and second short circuit conductor, and a coupling conductor, which forms a combination of a planar inverted F antenna and a loop antenna structure, allowing for efficient radiation without significant area increase and minimizing interference from metallic exteriors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a loop antenna is used in portable electronic devices, then the antenna radiation performance is less affected by metallic materials and human body contact, but the area required is larger and it is difficult to fit into small and thin devices
Solution Approach 1:
The patent combines a PIFA structure and a loop antenna structure into a single integrated antenna system. The PIFA portion provides compact size while the loop portion provides stable radiation performance less affected by metallic materials and human body contact. The two structures are electrically connected to work together as one antenna system, resolving the contradiction between small area and reliable radiation performance.
Solution Approach 2:
The antenna uses a composite structure combining different antenna types (PIFA and loop) with different electromagnetic characteristics. This composite approach allows the antenna to benefit from the compactness of PIFA and the metal-insensitivity of loop antennas simultaneously, achieving both small area and reliable radiation performance.
2Area of stationary object
If a PIFA is used in portable electronic devices, then the area required is smaller suitable for small and thin devices, but the efficiency is reduced when metallic materials are used in the exterior
Solution Approach 1:
The patent merges a PIFA structure with a loop antenna structure. The PIFA portion maintains the compact area advantage while the integrated loop portion compensates for the efficiency loss caused by metallic materials. The combined structure allows the antenna to maintain both small area and high efficiency even when metallic materials are used in the device exterior.
3Reliability
If a combination of PIFA and loop antenna structures is used, then the antenna radiation is unaffected by metallic exterior and multiple frequency bands are supported, but the device complexity increases
Solution Approach 1:
The patent integrates two antenna structures into one unified antenna system that shares common components such as the feed point, grounding, and substrate. This merging approach reduces the overall complexity compared to using two separate antennas, while still achieving multi-frequency band support and metal-insensitivity through the combined PIFA-loop structure.
Solution Approach 2:
The combined antenna structure serves multiple functions: it operates across multiple frequency bands (dual-band or multi-band), provides stable radiation performance insensitive to metallic materials, and maintains compact size. This multi-functionality is achieved through a single integrated structure rather than multiple separate antenna systems, reducing overall device complexity.
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 solution enables effective antenna radiation performance across multiple frequency bands with reduced interference from metallic materials, maintaining device compactness and efficiency.
Implementation Method 1
The radiation portion resonates at a first frequency. The radiation conductor resonates at a second frequency.
Data Source
AI summary
A portable electronic device includes a housing, a substrate, a radiation conductor and a short circuit conductor. The housing defines an accommodating space and includes a frame that has a body portion and a radiation portion. The substrate is disposed in the accommodating space, is surrounded by the frame, and has a grounding portion. The radiation conductor is disposed in the accommodating space, is electrically coupled to the radiation portion, and includes a feed-in point. The short circuit conductor is electrically coupled between one end of the radiation portion and the grounding portion.