Multi-Frequency Antenna Structure With Switching Circuit
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Solution Overview
Problem
Designing an antenna with good radiation characteristics for wireless communication devices that operates within a limited keep-out-zone, covering a low frequency band of 704-960 MHz and a high frequency band of 1710-2690 MHz, while maintaining efficient frequency coverage and reducing interference from other electronic components.
Innovation Solution
The antenna structure incorporates a metallic sheet or flexible printed circuit design with specific radiating and ground portions, along with a switching circuit that adjusts the low frequency band by connecting different inductance values of switching elements, allowing the antenna to operate across multiple frequency bands, including LTE-A Bands, and maintains wideband frequency characteristics for Carrier Aggregation technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monopole antennas or inverted-F antennas are used, then the antenna can operate in wireless communication devices, but the antenna requires a corresponding keep-out-zone which limits the available design space
Solution Approach 1:
The patent transitions from planar antenna designs to a three-dimensional structure by positioning the radiating element above the ground portion at a specific height, creating a spatial separation that reduces the required keep-out-zone area while maintaining radiation performance
Solution Approach 2:
The antenna structure embeds multiple functional elements within a compact configuration, where the radiating portion, ground portion, and switching circuit are integrated in a nested arrangement that minimizes the overall keep-out-zone requirement
2Adaptability or versatility
If the antenna is designed to cover both low frequency band (704-960 MHz) and high frequency band (1710-2690 MHz), then the frequency coverage is expanded, but the device complexity increases due to the need for switching circuits and multiple components
Solution Approach 1:
The patent implements a switching circuit that dynamically reconfigures the antenna structure by connecting different capacitance values to the radiating portion, enabling the antenna to adapt between low and high frequency bands as needed
Solution Approach 2:
The antenna structure is designed with universal components that serve multiple functions: the same radiating portion and ground portion structure is used for both frequency bands, while the switching circuit selectively activates appropriate capacitance values to achieve band-specific operation
3Area of stationary object
If the antenna operates in a limited keep-out-zone, then the space requirement is reduced, but the radiating efficiency decreases due to spatial constraints
Solution Approach 1:
The patent optimizes the height parameter of the radiating portion above the ground plane, finding that positioning it at approximately one-twelfth to one-sixth of the wavelength achieves optimal radiating efficiency within constrained keep-out-zone dimensions
Solution Approach 2:
The antenna structure concentrates the radiating function in a localized region above the ground portion, creating a focused radiation pattern that maintains efficiency despite the limited overall keep-out-zone area
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 efficient radiation across the specified frequency bands with adjustable low frequency operation, maintaining high radiating efficiency and total radiating efficiency of 30-65% across the middle and high frequency bands, effectively covering system bandwidths required by multiple communication systems.
Implementation Method 1
The antenna structure includes a feed portion, a first ground portion, a second ground portion, a first radiating portion, a second radiating portion, a third radiating portion, and an extension portion
Implementation Method 2
a switching circuit that adjusts the low frequency band by connecting different inductance values of switching elements
Data Source
AI summary
A multi-frequency antenna structure includes a feed portion, a first ground portion, a first radiating portion, a second radiating portion, and a third radiating portion. The feed portion supplies current to the antenna structure. The first ground portion is spaced apart from the feed portion and grounds the antenna structure. The first radiating portion is electrically connected to the feed portion. The second radiating portion is spaced apart from the first radiating portion and is electrically connected to the first ground portion. The third radiating portion is spaced apart from the second radiating portion and is electrically connected to the feed portion and the first radiating portion.