Nested Wide-band Antenna Element for WWAN LTE Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Designing compact antennas for mobile communication devices that operate effectively in dual wide bands such as WWAN and LTE is challenging due to limited internal space and the need for high radiation efficiency.
Innovation Solution
A wide-band antenna element is designed with a first radiation element coupled through an inductive element to a second radiation element, featuring bends that create effective inductance and capacitance, allowing for additional resonant modes and maintaining high radiation efficiency across multiple bands without increasing the antenna's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna element size is decreased to fit limited internal space, then the device profile becomes slimmer and space utilization improves, but the radiation efficiency and band coverage deteriorate
Solution Approach 1:
The first radiation element is nested within the structure formed by the second radiation element. The first radiation element comprises a first portion and a second portion with bends, where the second portion is positioned inside the loop formed by the second radiation element. This nesting allows both elements to occupy the same spatial envelope, achieving compact dual-band operation without increasing overall antenna size
Solution Approach 2:
The antenna is segmented into two distinct radiation elements with different functions. The first radiation element (with bends and coupling gap) generates resonance in the lower band (e.g., GSM 850/900), while the second radiation element (loop structure) generates resonance in the upper band (e.g., LTE 1800/2100/2600). This segmentation allows each element to be optimized for its specific frequency range, maintaining radiation efficiency in both bands despite compact overall size
2Adaptability or versatility
If the antenna element is designed for dual wide-band operation (WWAN and LTE), then the band coverage and versatility improve, but the device complexity and design difficulty increase
Solution Approach 1:
The antenna element achieves multi-functionality by integrating two radiation elements that can operate independently in different frequency bands. The first radiation element covers lower bands (GSM 850/900) while the second radiation element covers upper bands (LTE 1800/2100/2600). Both elements share the same compact physical structure and can be simultaneously activated or independently controlled, providing universal coverage across multiple WWAN and LTE bands without requiring separate antenna systems
Solution Approach 2:
The nested configuration allows the first radiation element to be positioned within the structure formed by the second radiation element. This spatial arrangement enables both elements to coexist in a compact footprint while maintaining their respective resonance characteristics. The nesting simplifies the overall antenna structure compared to using separate antenna elements, reducing design complexity while achieving dual-band functionality
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 wide-band operation covering WWAN/LTE bands with high radiation efficiency, specifically generating resonant modes in both lower and higher bands, ensuring effective dual-band coverage while maintaining a compact size.
Implementation Method 1
the plurality of bends of the second portion of the first radiation element generate an effective inductance
Implementation Method 2
the coupling gap between the second portion and the first portion of the first radiation element generates an effective capacitance
Implementation Method 3
Owing to the effective inductance and the effective capacitance, the antenna element can generate a parallel resonance near the lower band
Implementation Method 4
The first radiation element is configured to generate a resonant mode at about 850MHz
Implementation Method 5
The two resonant modes are close to each other to form a wide band
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A communication device including a ground element and an antenna element is provided. The antenna element is disposed adjacent to the ground element. The antenna element includes a first radiation element and a second radiation element. The first radiation element includes a first portion and a second portion. The first portion is coupled through an inductive element to the second portion. The first portion is coupled to a signal source. The second portion includes a plurality of bends such that a coupling gap is formed between an open end of the second portion and the first portion. The second radiation element has a shorted end and an open end. The shorted end of the second radiation element is coupled to the ground element. The second radiation element extends and at least partially surrounds the first radiation element.