Multi-band Antenna with Nested Branches for Bandwidth
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Solution Overview
Problem
Existing multi-frequency band antennas for mobile communication terminals face challenges in achieving adequate bandwidth, size reduction, cost-effectiveness, and radiation efficiency, particularly in supporting both low and high-frequency bands like 900 MHz GSM and 2.1 GHz UMTS bands.
Innovation Solution
A multi-band radio antenna device with an integral feed and ground structure electrically connected to radiating antenna elements, featuring continuous traces of conductive material with branches tuned to specific frequency bands, utilizing capacitive coupling and a parasitic element to enhance bandwidth and gain, without expensive ceramic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If expensive specialized ceramic materials and dielectric pellets are used to achieve broad bandwidth in high-band, then bandwidth in high-band is improved, but cost increases and gain is reduced
Solution Approach 1:
The patent replaces expensive specialized ceramic materials with conventional printed circuit board materials and standard dielectric substrates. The high-band radiating element is implemented using standard PCB fabrication techniques with readily available materials, eliminating the need for costly ceramic pellets while achieving the desired broadband performance
Solution Approach 2:
The patent achieves broadband high-band performance by optimizing the geometric configuration and dimensions of the high-band radiating element rather than relying on expensive ceramic materials. Parameters such as the perimeter length, trace width, and substrate thickness are carefully selected to achieve the desired impedance matching and bandwidth without requiring specialized materials
2Volume of moving object
If antenna size is reduced to meet miniaturization demands, then terminal size is reduced, but achieving adequate bandwidth and performance across multiple frequency bands becomes more difficult
Solution Approach 1:
The high-band radiating element is positioned within or adjacent to the low-band radiating element structure, allowing the smaller high-band element to be nested within the overall antenna footprint defined by the larger low-band element. This nested arrangement enables both elements to coexist in a compact space while maintaining their respective performance characteristics
Solution Approach 2:
The patent utilizes three-dimensional space by positioning the low-band and high-band radiating elements at different heights or layers within the terminal housing. This vertical stacking or layered arrangement allows both elements to operate independently in different spatial dimensions, achieving multi-frequency performance in a compact volume
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 solution provides significant bandwidth in high-frequency bands, suitable for compact, cost-effective, and flexible antenna designs that maintain performance across multiple frequency bands, including low-frequency bands like 900 MHz GSM and high-frequency bands like 2.1 GHz UMTS, with improved radiation efficiency and reduced size.
Implementation Method 1
The third branch is capacitively coupled to the second branch and arranged substantially adjacent to the second branch
Implementation Method 2
a first branch that is tuned to radiate at first frequencies in a first frequency band, and a second branch, which is tuned to radiate in a second frequency band
Data Source
AI summary
A multi-band radio antenna device for a radio communication terminal includes an integral feed and ground structure electrically connected to a first radiating antenna element and a second radiating antenna element. The first radiating antenna element includes a first continuous trace of conductive material, wherein the first continuous trace has a first branch tuned to radiate at first frequencies in a first frequency band, and a second branch, which is tuned to radiate in a second frequency band at second frequencies approximately equal to or greater than two times the first frequencies. The said second radiating antenna element has a second continuous trace of conductive material, wherein the second continuous trace has a third branch capacitively coupled to the second branch. Such an antenna device is suitable for built-in antennas, at the same time having a wide high-frequency band bandwidth, which enables the antenna to be operable at a number of frequency bands.