Broadband Switchable Antenna with Dynamic Band Segmentation
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Solution Overview
Problem
Current broadband antenna designs face challenges in balancing high-band and low-band performance within limited space, while also meeting carrier and regulatory requirements such as reduced keep-out area, lower profile, and Specific Absorption Rate (SAR) standards, especially in wireless devices with smaller form factors and multiple components.
Innovation Solution
A hybrid broadband switchable antenna design featuring a high-band and low-band antenna arm configuration with a switch to toggle between modes, allowing for efficient operation in high-band and low-band frequencies without sacrificing performance, and incorporating a switchable architecture that includes a single antenna feed, high-band and low-band antenna arms, and a switch to control resonating frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single broadband antenna is used to support multiple frequency bands, then the number of antenna components is reduced, but the antenna performance in specific frequency bands deteriorates due to the need to balance high-band and low-band requirements
Solution Approach 1:
The patent employs a switching mechanism that dynamically reconfigures the antenna structure between different operational states. The switch can connect or disconnect different antenna arms (high-band arm, low-band arm, coupled arm) based on the required frequency band, transforming a static broadband antenna into a dynamic reconfigurable system that optimizes performance for each band separately
Solution Approach 2:
The antenna is divided into distinct functional segments: a high-band antenna arm, a low-band antenna arm, and a coupled antenna arm. Each segment is optimized for specific frequency ranges, and the switching mechanism selectively activates the appropriate segment, avoiding the performance compromise of a unified broadband design
2Area of stationary object
If the antenna keep-out area is reduced to accommodate smaller device form factors, then the device profile is improved, but the antenna performance and coexistence with other components deteriorates
Solution Approach 1:
The switching mechanism allows the antenna to dynamically adjust its effective electrical length and resonant characteristics. By selecting different antenna arms or coupling configurations, the antenna maintains optimal performance within a reduced physical footprint, as each segment is designed to be highly efficient at its designated frequencies
Solution Approach 2:
The patent utilizes a coupled antenna arm that extends in a different spatial dimension or orientation relative to the main antenna arms. This dimensional separation allows the antenna to achieve the necessary electrical length for low-band operation without occupying additional planar space, thus reducing the keep-out area while maintaining performance
3Length of stationary object
If the antenna profile is lowered to meet industrial design requirements, then the device aesthetics are improved, but the antenna radiation performance and impedance matching deteriorates
Solution Approach 1:
The antenna structure is segmented into multiple arms with different orientations and lengths. The high-band arm and low-band arm are configured to achieve resonance at their respective frequencies with minimized profile height. The segmentation allows each arm to be optimized independently for low-profile operation while maintaining radiation efficiency
Solution Approach 2:
The antenna design utilizes three-dimensional spatial arrangement of antenna arms, where elements are positioned at different heights and angles. This dimensional configuration enables the antenna to achieve the necessary electrical length and radiation characteristics without increasing the overall profile height, as the current paths extend in multiple spatial dimensions rather than purely vertically
4Adaptability or versatility
If a switchable architecture is added to enable band switching, then the frequency band adaptability is improved, but the device complexity and insertion loss increase
Solution Approach 1:
The switching mechanism provides dynamic reconfiguration capability, allowing the antenna to adapt to different frequency bands by connecting or disconnecting specific antenna arms. This dynamic control enables the system to optimize performance for each band while maintaining a relatively simple switch topology that minimizes insertion loss
5Adaptability or versatility
If multiple antenna arms are used to support different frequency bands, then the frequency coverage is improved, but the antenna coupling issues and interference between bands worsen
Solution Approach 1:
The switching mechanism extracts or isolates the active antenna arm from the others during operation. By connecting only the required arm (high-band or low-band) to the feed while leaving other arms disconnected, the patent eliminates mutual coupling and interference between simultaneously active elements, as only one arm is energized at a time
Solution Approach 2:
The dynamic switching between different antenna arm configurations prevents simultaneous excitation of multiple arms. The switch rapidly transitions between states, ensuring that at any given moment, only the appropriate arm for the current frequency band is active, thereby minimizing inter-band coupling and interference effects
Data Source
AI summary
System and method embodiments are provided for a broadband switchable antenna. The embodiments enable an easily tunable, temporally switchable antenna with good low- and high-band performance with controlled high impedance loci that easily coexists with other wireless device components. In an embodiment, a broadband switchable antenna includes an antenna feed; a high-band antenna arm comprising a first end electrically coupled to an antenna feed and a second end electrically coupled to ground; a switch coupled to the antenna feed at a position proximate to the first end of the high-band antenna arm; and a low-band antenna arm comprising a first end electrically coupled to the switch, wherein the antenna is configured to operate in a high-band mode when the switch is open and to operate in a low-band mode when the switch is closed.