Switchable Antenna Extension for Multi-Band Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current antenna designs for wireless communication devices fail to efficiently cover multiple frequency bands, particularly the low frequency range of 700-900 MHz, while also being cost-effective and compact.
Innovation Solution
The antenna structure incorporates a coplanar arrangement of ground, feed, high-frequency resonance, high-frequency radiating, low-frequency radiating, and extension portions, along with a switching unit that allows the antenna to switch between short-circuit and open-circuit states, enabling operation across various frequency bands including 703-803 MHz and 880-960 MHz, and potentially 1710-2170 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are used to cover different frequency bands, then frequency band coverage is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a single antenna structure that can operate across multiple frequency bands (700-900 MHz, 1710-2170 MHz, and other bands) by using a switching unit to reconfigure the antenna's electrical characteristics. The antenna includes a ground portion, feed portion, resonance portion, and radiating portion that can be selectively connected or disconnected to match different impedance requirements for different frequency bands, eliminating the need for multiple separate antennas
Solution Approach 2:
The patent employs a switching unit that dynamically reconfigures the antenna structure by switching between different connection states (short-circuit or open-circuit) of the extension portion. This dynamic reconfiguration allows the antenna to adapt its electrical length and impedance characteristics to optimize performance across different frequency bands during device operation
2Volume of moving object
If antenna size is reduced to fit compact devices, then device size is improved, but low frequency coverage becomes difficult to achieve
Solution Approach 1:
The patent incorporates an extension portion that can be electrically connected or disconnected to effectively change the antenna's electrical length without increasing its physical dimensions. When the extension portion is connected, it extends the effective radiating length for low frequency operation; when disconnected, the antenna maintains its compact form factor while operating at higher frequencies
Solution Approach 2:
The patent uses a switching unit to change the electrical configuration of the antenna in the dimensional sense by switching between short-circuit and open-circuit states. This allows the same physical structure to present different effective lengths and impedance characteristics, enabling both compact size and multi-frequency operation including low frequency bands
3Device complexity
If a single antenna is used to support all frequency bands, then cost is reduced, but achieving wide bandwidth especially at low frequencies becomes difficult
Solution Approach 1:
The patent changes the electrical parameters of the single antenna structure by using a switching unit to reconfigure the connection state of the extension portion. By switching between different impedance configurations (short-circuit or open-circuit connections), the antenna's resonant frequency and bandwidth characteristics are adjusted to cover multiple frequency bands including the challenging 700-900 MHz low frequency range
Data Source
AI summary
An antenna structure includes a feed portion, a high-frequency radiating portion, a low-frequency radiating portion, an extension portion, and a switching unit. The high-frequency radiating portion is electrically connected to the feed portion. The low-frequency radiating portion is electrically connected to the high-frequency radiating portion. The extension portion is electrically connected to the feed portion and the high-frequency radiating portion. The switching unit is electrically connected to the extension portion to control the extension portion to be in one of an open-circuit state and a short-circuit state.