Switchable Antenna Radiator for Multi-Band Support
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Solution Overview
Problem
There is a challenge in designing a compact antenna device for portable electronic devices that can support multiple frequency bands while minimizing interference with other circuit components, particularly in reducing the thickness of the device while maintaining effective radiation efficiency across various frequency bands.
Innovation Solution
The antenna device incorporates a switching element that adjusts the electrical length of the radiation section, allowing it to operate at different resonance frequencies by opening or closing the switching element, thereby reducing losses and maintaining performance across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of radiators is increased to support multiple frequency bands, then the adaptability to various frequency bands is improved, but the device thickness and complexity increase
Solution Approach 1:
The patent applies dynamics by making the antenna radiator adjustable through a switching element that can change the electrical length of the radiator. This allows a single radiator to dynamically adapt its resonance frequency to support multiple frequency bands, replacing the need for multiple fixed radiators and thereby reducing structural complexity while maintaining frequency band adaptability
Solution Approach 2:
The patent employs parameter changes by modifying the electrical length of the radiator through the switching element. By changing the effective length parameter of the radiator, the resonance frequency is adjusted to match different frequency bands, enabling one radiator to serve multiple frequency bands without increasing device complexity
2Adaptability or versatility
If the electrical length of the radiator is increased to lower the resonance frequency, then the adaptability to lower frequency bands is improved, but the physical length and device thickness increase
Solution Approach 1:
The patent applies dimensionality change by using a meander line configuration for the radiator. This transforms the physical layout from a straight line to a folded pattern, allowing the electrical length to be extended within a compact physical footprint. The meander line achieves longer electrical length without proportionally increasing the physical length or device thickness, enabling low frequency band support in compact devices
Solution Approach 2:
The patent employs nesting by folding the radiator into a meander line pattern where the conductor is nested back on itself multiple times. This nesting approach packs a long electrical length into a small physical space, allowing the radiator to achieve the necessary electrical length for low frequency operation without increasing the overall device dimensions
3Adaptability or versatility
If a switching element is added to adjust resonance frequency, then the adaptability to multiple frequencies is improved, but the loss and interference with other circuits increase
Solution Approach 1:
The patent applies the intermediary principle by using a capacitor as the switching element instead of a traditional switch. The capacitor provides a high-impedance path when open and low-impedance path when closed, enabling frequency adjustment while minimizing signal loss. The capacitor acts as an intermediary that can selectively connect or disconnect portions of the radiator without introducing significant losses or interference to other circuits
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
This solution enables the antenna device to efficiently handle various frequency bands with reduced loss and interference, maintaining stable radiation characteristics and performance even when switching between resonance frequencies.
Implementation Method 1
The processor may use a first resonance frequency by opening the switching element and use a second resonance frequency which is different from the first resonance frequency by closing the switching element
Data Source
AI summary
An electronic device including a processor and an antenna device is provided. The antenna device includes a power feeding unit, a first radiation section connected to the power feeding unit, and a switching element including a first terminal electrically connected to first portion of the first radiation section, and a second terminal electrically connected to a second portion of the first radiation section. The processor uses a first resonance frequency band when the switching element is opened and uses a second resonance frequency which is different from the first when the switching element is closed.