Switchable Antenna Conductive Pattern for Mid-Band Frequency Variation
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Solution Overview
Problem
Electronic devices face challenges in shifting to targeted frequency bands within the mid-band range (1710 MHz to 2170 MHz) due to limited frequency variation, making it difficult to switch and maintain communication effectively.
Innovation Solution
The implementation of a conductive pattern connected to an antenna radiator in an electronic device, forming a closed-loop pattern at the ground region, which expands the frequency variation and improves mounting efficiency by being disposed on a different layer from the printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna structure is used in the mid-band range, then the device can maintain a simple structure, but the frequency variation becomes narrow making it difficult to switch to targeted frequency bands
Solution Approach 1:
The patent implements a switchable antenna structure where the ground connection can be dynamically changed between a conventional ground and a closed-loop pattern ground. This dynamic reconfiguration allows the antenna to adapt its electrical characteristics and resonate at different frequency bands (e.g., switching between 1710-2170 MHz and other mid-band frequencies), thereby resolving the contradiction between maintaining simple structure and achieving wide frequency variation.
Solution Approach 2:
The patent changes the electrical parameters of the antenna by introducing a closed-loop pattern as an alternative ground connection. This closed-loop pattern has different inductance and capacitance characteristics compared to the conventional ground, which alters the resonant frequency and impedance of the antenna. By switching between different ground configurations, the antenna can operate across a wider frequency range while maintaining structural simplicity.
2Adaptability or versatility
If the closed-loop pattern is disposed on the same layer as the printed circuit board, then the mounting process is simplified, but the frequency variation expansion is limited
Solution Approach 1:
The patent positions the closed-loop pattern on a different layer from the printed circuit board, creating a three-dimensional electromagnetic structure. This spatial separation allows the closed-loop pattern to provide different electromagnetic coupling characteristics and resonant modes, thereby expanding the frequency variation range. The multi-layer configuration enables the antenna to utilize both the PCB layer and the separate layer for optimized performance across multiple frequency bands.
Data Source
AI summary
An electronic device includes a housing that includes a first plate, a second plate, and a side member, the side member including a first conductive portion, a second conductive portion, a third conductive portion, a first insulating portion, and a second insulating portion, a wireless communication circuitry that is electrically connected to a first point of the first conductive portion, wherein the first point is adjacent to the second insulating portion, a ground member that is included in the housing, a first switching circuitry that includes a first terminal electrically connected to a second point of the first conductive portion, which is more distant from the second insulating portion than the first point, and at least one second terminal electrically connected to the ground member through at least one first passive element, and a conductive pattern that is electrically connected to the second point and forms a closed loop.