Compact LTE Antenna Using Segmented Ground Conductor
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Solution Overview
Problem
Conventional multi-frequency band antennas for LTE systems are complex in structure and large in size, making them unsuitable for the miniaturization and lightweight requirements of modern hand-held devices, which necessitate improved design for enhanced transmission capabilities across various frequency bands.
Innovation Solution
A compact external LTE multi-frequency band antenna design featuring a substrate with specific geometric configurations, including a J-shaped radiating portion, L-shaped feed-in conductor, and high frequency band bandwidth adjusting conductor, optimized for impedance matching and frequency bands ranging from 690-960 MHz to 2.3-2.5 GHz, allowing for rotational adjustment for better wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional multi-frequency band antenna design is used, then frequency band coverage is achieved, but structure complexity increases and size becomes large
Solution Approach 1:
The antenna is divided into distinct functional segments: a radiating element with specific geometric shapes (inverted-F structure with additional conductors), a feed-in conductor with L-shape configuration, and a ground portion with main ground conductor and bandwidth adjusting conductor. Each segment performs a specific function, allowing the overall antenna to achieve multi-frequency band operation through coordinated segmentation rather than a monolithic complex structure.
Solution Approach 2:
The patent introduces dimensional variations in the conductor configurations - the inverted-F radiating element extends in multiple directions with specific lengths and widths, the L-shaped feed-in conductor provides multi-directional connection, and the bandwidth adjusting conductor adds dimensional control. These dimensional changes enable the antenna to resonate at multiple frequency bands while maintaining a compact planar structure on the substrate.
2Adaptability or versatility
If conventional multi-frequency band antenna design is used, then frequency band coverage is achieved, but antenna size becomes large
Solution Approach 1:
The antenna structure employs a nested configuration where the radiating element is folded back onto itself in an inverted-F shape, with the feed-in conductor nested within the overall structure. The ground portion and bandwidth adjusting conductor are integrated into the same planar space. This nesting allows the antenna to achieve the electrical length required for low-frequency operation (690-960 MHz) while maintaining a compact physical footprint suitable for hand-held devices.
Solution Approach 2:
By utilizing vertical dimension through the inverted-F configuration and multi-directional extensions of conductors, the antenna achieves extended electrical path length without proportional increase in planar area. The specific length and width dimensions of each conductor segment are optimized to resonate at target frequencies while confining the overall structure to a compact size that fits within hand-held device constraints.
3Volume of moving object
If compact antenna design is used, then size is reduced, but transmission ability may be compromised
Solution Approach 1:
The patent systematically varies critical parameters including the length and width of the radiating element conductors, the configuration of the L-shaped feed-in conductor, and the dimensions of the ground portion and bandwidth adjusting conductor. These parameter changes are optimized to achieve resonance at multiple frequency bands (690-960 MHz, 1.71-2.17 GHz, 2.3-2.5 GHz) while maintaining good impedance matching and radiation efficiency, thereby ensuring reliable transmission ability in a compact form factor.
Solution Approach 2:
Different portions of the antenna structure are designed with locally optimized properties: the radiating element has specific length and width ratios for efficient radiation, the feed-in conductor has L-shape configuration for impedance transformation and feeding, the ground portion provides reference potential and affects resonance, and the bandwidth adjusting conductor locally modifies the electrical characteristics. This local quality optimization ensures each segment contributes maximally to overall transmission performance.
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 antenna achieves suitable impedance matching and operating bandwidth across multiple frequency bands, ensuring efficient wireless communication while being compact and lightweight, addressing the size and complexity issues of conventional antennas.
Implementation Method 1
an L-shaped feed-in conductor disposed on the second surface, wherein a capacitive coupling is formed between the L-shaped feed-in conductor and the J-shaped radiating portion
Data Source
AI summary
An antenna is provided. The antenna includes a substrate having a first end and a second end opposite to the first end, wherein a direction from the first end to the second end is an extending direction of the antenna; a radiating portion; a feed-in conductor; and a ground portion electrically connected to the radiating portion, coupled to the feed-in conductor, disposed on the substrate from the first end along the extending direction, and including a main ground conductor; and a high frequency band bandwidth adjusting conductor extended from the main ground conductor along the extending direction.