Antenna Apparatus Miniaturization via Third Element Impedance
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Solution Overview
Problem
Conventional multifrequency antenna apparatuses face challenges in miniaturization as reducing the distance between folded and monopole elements decreases impedance, making it difficult to achieve satisfactory antenna characteristics for both low-frequency and high-frequency bands.
Innovation Solution
The antenna apparatus includes a first antenna element, a second antenna element, and a third branch element, where the third element enhances current cancellation at the feed terminal, increasing resonance impedance and allowing for a lower resonant frequency, thereby enabling further miniaturization while maintaining effective antenna characteristics across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between the folded element and the monopole element is reduced to miniaturize the antenna apparatus, then the size of the antenna apparatus is reduced, but the impedance of the monopole element decreases and satisfactory antenna characteristics cannot be obtained
Solution Approach 1:
The antenna apparatus is divided into multiple independent elements (folded element for low frequency, monopole element for high frequency) that can be positioned at different locations. This segmentation allows each element to maintain its optimal impedance characteristics while contributing to the overall miniaturized structure through strategic spatial arrangement.
Solution Approach 2:
The patent transitions from a single-dimensional size reduction approach to a multi-dimensional spatial arrangement. By positioning the folded element and monopole element at different locations and orientations within the housing, the design achieves miniaturization while preserving impedance characteristics through three-dimensional optimization rather than simply reducing distances in one direction.
2Adaptability or versatility
If a single antenna apparatus is designed to cover both low-frequency and high-frequency bands, then multi-frequency communication capability is achieved, but the structural complexity increases
Solution Approach 1:
The antenna apparatus achieves multi-functionality by integrating two distinct antenna elements (folded element and monopole element) into a single housing structure. Each element is optimized for specific frequency bands, allowing the unified antenna system to provide broad frequency coverage across low-frequency (e.g., 800 MHz) and high-frequency (e.g., 2 GHz) bands without requiring separate antenna systems.
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
This configuration allows for the miniaturization of the antenna apparatus while maintaining or improving resonance impedance and frequency coverage, enabling compact designs for portable devices to communicate across various radio systems.
Implementation Method 1
a third antenna element (63A, 63B) disposed so as to face a portion of the second antenna element (62). The portion of the third antenna element (63A, 63B) disposed so as to face the second antenna element (62) is closer to the second antenna element (62) than a portion of the first antenna element (61)
Data Source
AI summary
According to one embodiment, an antenna apparatus includes a first antenna element, a second antenna element, and a third antenna element. The first antenna element has one end connected to a feed terminal, and other end open. The second antenna element has one end connected to a first position set on an element of the first antenna element, and other end open, with a portion between one end and the other end being disposed parallel to the first antenna element. The third antenna element has one end connected to a second position set between the other end and the first position on the element of the first antenna element, and other end open, with at least part of a portion between one end and the other end being disposed near the second antenna element.