Slot-Fed Monopole Antenna for Orthogonal MIMO in Mobile Terminals
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Solution Overview
Problem
The challenge is to arrange multiple antennas in limited design space within mobile terminals with a high screen-to-body ratio and increasing multimedia components, while also considering industry design requirements such as metal IDs or full-screen designs, to achieve efficient antenna arrangement.
Innovation Solution
The proposed antenna apparatus includes a grounding plate and a monopole with a slot structure, where the monopole extends into the slot, forming a feeding structure that excites two orthogonal radiation modes, utilizing the grounding plate as a main radiator for balanced high-performance radiation with a compact and simple structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are arranged in limited design space, then antenna coverage and MIMO functionality are improved, but device complexity and arrangement difficulty increase
Solution Approach 1:
The patent implements a single antenna structure that can operate in two orthogonal radiation modes (first and second radiation modes) to achieve dual-antenna functionality. The antenna apparatus includes a monopole and a grounding plate that can be excited by two feeding units to produce orthogonal polarizations, allowing one physical antenna to replace two separate antennas and simplify the arrangement in limited design space.
Solution Approach 2:
The patent changes the operational parameters of the antenna by exciting it in two different radiation modes with orthogonal polarizations. By adjusting the feeding structures and resonance conditions, the antenna can switch between different radiation patterns and frequency bands, enabling versatile coverage without increasing physical complexity.
2Area of stationary object
If antenna space is compressed to accommodate higher screen-to-body ratio, then display area is improved, but antenna arrangement difficulty increases
Solution Approach 1:
The antenna apparatus serves multiple functions within a compact structure: it provides dual-antenna effect with orthogonal polarizations, supports multiple frequency bands (including Sub-6G and Wi-Fi), and achieves high isolation between modes. This multi-functionality allows the antenna to occupy minimal space while maintaining full communication capabilities.
3Ease of manufacture
If simple and compact structure is used, then ease of manufacture is improved, but achieving dual-antenna effect with high isolation becomes difficult
Solution Approach 1:
The patent introduces a slot structure with specific geometric characteristics (first slot and second slot with different orientations) in the grounding plate to create localized electromagnetic field distributions that are orthogonal to each other. This local structural differentiation enables high isolation between the two radiation modes while maintaining overall structural simplicity and ease of manufacturing.
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 solution enables a dual-antenna effect with high isolation and stable radiation performance, effectively utilizing limited space in mobile terminals, and can operate on various frequency bands including Sub-6G and Wi-Fi frequencies.
Implementation Method 1
The first feeding unit is electrically connected to the grounding plate and is configured to feed the feeding structure, to excite a first radiation mode of the antenna apparatus, where the first slot and the grounding plate are used as radiators in the first radiation mode. The second feeding unit is electrically connected to the second stub and is configured to feed the feeding structure, to excite a second radiation mode of the antenna apparatus, where the second stub and the grounding plate are used as radiators in the second radiation mode.
Data Source
AI summary
An antenna apparatus includes a grounding plate, a monopole, a first feeding component, and a second feeding component. A slot on the grounding plate includes a first slot and a second slot that interpenetrate each other, the second slot extends from the first slot to an edge of the grounding plate. The monopole includes a first stub and a second stub extending from the first stub to the second slot, the second stub and the second slot form a feeding structure. The first feeding component is electrically coupled to the grounding plate to feed the feeding structure to excite a first radiation mode of the antenna apparatus. The second feeding component is electrically coupled to the second stub to feed the feeding structure to excite a second radiation mode of the antenna apparatus. Polarizations in the two radiation modes are orthogonal.