Broadband Antenna Inductor Loop Effect for LTE
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Solution Overview
Problem
Current broadband antennas for LTE systems face challenges in achieving high bandwidth and radiation efficiency while minimizing size and conforming to Specific Absorption Rate (SAR) regulations, with planar inverted-F antennas occupying more space and coupled type antennas being vulnerable to environmental fluctuations and impedance matching issues.
Innovation Solution
A broadband antenna design incorporating a coupled type antenna with an inductor to increase bandwidth, adjust impedance matching, and reduce dimensions, featuring a grounding unit, radiating elements, and a passive component like an inductor forming a loop antenna effect to enhance operational frequency bands and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a planar inverted-F antenna is used to achieve broadband and high radiation efficiency, then the radiation efficiency is improved, but the antenna occupies larger space
Solution Approach 1:
The patent embeds an inductor structure within the antenna design, where the inductor is integrated into the radiating element or grounding structure. This nesting approach allows the antenna to achieve broadband and high radiation efficiency characteristics without occupying larger space, as the inductor is incorporated into the existing antenna geometry rather than adding separate components
Solution Approach 2:
The patent modifies the antenna parameters by introducing an inductor with specific inductance values (e.g., 10nH, 22nH, 56nH) to change the electrical characteristics of the antenna. This parameter change enables the antenna to achieve broadband operation and high radiation efficiency while maintaining a compact size, as the inductor adjusts the resonant frequency and impedance matching without requiring larger physical dimensions
2Area of stationary object
If a coupled type antenna is used to reduce size, then the antenna dimensions are minimized, but the performance becomes vulnerable to environment fluctuations and impedance matching becomes difficult
Solution Approach 1:
The patent introduces an inductor as an intermediary component between the coupled radiating elements. This inductor acts as a mediator that stabilizes the impedance matching and reduces the sensitivity to environmental fluctuations. By placing the inductor in series or parallel with the coupled elements, it provides a reference impedance that compensates for environmental variations, thereby improving performance stability while maintaining the compact coupled structure
Solution Approach 2:
The patent adjusts the inductance parameter of the introduced inductor to optimize the impedance matching of the coupled antenna structure. By carefully selecting the inductance value, the antenna achieves better impedance matching across the operating bandwidth while maintaining compact dimensions. This parameter adjustment also reduces the sensitivity to environmental changes, improving overall reliability
3Object-affected harmful factors
If the antenna structure is modified to reduce SAR value, then the Specific Absorption Rate compliance is improved, but the radiation efficiency is negatively impacted
Solution Approach 1:
The patent introduces an inductor with specific inductance values to change the current distribution pattern on the antenna structure. This parameter change allows the antenna to reduce SAR values by creating more favorable current paths that reduce energy concentration in the human body, while simultaneously maintaining or improving radiation efficiency through better impedance matching and resonant characteristics provided by the inductor
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 design achieves broader bandwidth and improved radiation efficiency while minimizing antenna size, effectively addressing SAR compliance and environmental vulnerability, as demonstrated by voltage standing wave ratio and radiation efficiency diagrams.
Implementation Method 1
the passive component is electrically connected between the first and the second radiating elements or between a metal part of the first radiating element and the second radiating element to work in conjunction with the first radiating element, the second radiating element, and the grounding unit to form a loop antenna effect
Data Source
AI summary
A broadband antenna for a wireless communication device includes a grounding unit for grounding; a first radiating element; a second radiating element electrically connected to the grounding unit; a signal feed-in element for transmitting a radio signal to the first radiating element in order to emit the radio signal via the first radiating element; and a passive component comprising an inductor, where the passive component is electrically connected between the first and the second radiating elements to work in conjunction with the first radiating element, the second radiating element and the grounding unit to form a loop antenna effect.