Segmented Peripheral Antenna with Tunable Matching for Multi-Band Diversity
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Solution Overview
Problem
Conventional antenna structures in small electronic devices often have limited operating bandwidths, making it difficult to cover multiple wireless communications bands effectively.
Innovation Solution
The design incorporates a peripheral conductive member divided into segments with dielectric gaps, forming open circuits, and a conductive housing member to create dual antennas with tunable impedance matching circuitry, allowing the upper antenna to support a subset of bands and switch between different frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional antenna structures are used in small electronic devices, then the device maintains a compact form factor, but the antenna exhibits narrower operating bandwidths and cannot cover all communications bands of interest
Solution Approach 1:
The peripheral conductive member is divided into multiple segments by forming gaps at various points along its length. These gaps are filled with dielectric material and can be selectively bridged by switchable inductor circuits to configure different antenna topologies (e.g., inverted-F antenna, loop antenna) from a single segmented structure, enabling multi-band operation in a compact form.
Solution Approach 2:
The antenna system incorporates tunable impedance matching circuitry and switchable inductor circuits that can dynamically reconfigure the antenna's electrical characteristics. This allows the antenna to adapt its operating bandwidth and resonance frequencies to cover multiple cellular telephone bands (750 MHz, 850 MHz, 900 MHz, 1800 MHz, 1900 MHz, 2100 MHz) and other frequency ranges, transforming a static compact antenna into a dynamic multi-functional structure.
2Adaptability or versatility
If the antenna bandwidth is increased to cover all communications bands, then the antenna can support multiple frequency ranges, but the antenna structure becomes larger and more complex
Solution Approach 1:
A single peripheral conductive member structure serves multiple functions by supporting different antenna configurations (inverted-F antenna for cellular bands, loop antenna for other frequencies) through selective activation of switchable inductors. This universal structure eliminates the need for separate dedicated antennas for each frequency band, reducing overall device complexity while maintaining broad communications coverage.
Solution Approach 2:
The antenna system uses tunable impedance matching circuitry and variable capacitor circuitry to dynamically adjust electrical parameters (impedance, resonance frequency, bandwidth) of the antenna structure. This allows a compact fixed physical structure to achieve variable electrical characteristics suitable for different communications bands, avoiding the need for physically larger or more complex multi-element antenna arrays.
3Device complexity
If a single antenna is used to cover all bands, then the device structure is simplified, but the receiver diversity capability is lost reducing reliability
Solution Approach 1:
The segmented peripheral conductive member enables the formation of multiple spatially separated antenna elements (upper antenna and lower antenna) from a single continuous conductive structure. These segmented antenna elements are positioned at different locations (upper end and lower end of the housing) to provide spatial diversity, improving signal reception reliability while maintaining a simplified single-structure implementation.
Solution Approach 2:
Switchable inductor circuits and impedance matching network serve as intermediary elements that enable a single peripheral conductive member structure to function as multiple independent antennas. These intermediary components allow selective activation and independent tuning of different antenna segments, providing receiver diversity capability while avoiding the complexity of completely separate antenna structures.
Data Source
AI summary
A wireless electronic device may include antenna structures and antenna tuning circuitry. The device may include a display mounted within a housing. A peripheral conductive member may run around the edges of the display and housing. Dielectric-filled gaps may divide the peripheral conductive member into individual segments. A ground plane may be formed within the housing. The ground plane and the segments of the peripheral conductive member may form antennas in upper and lower portions of the housing. The antenna tuning circuitry may include switchable inductor circuits and variable capacitor circuits for the upper and lower antennas. The switchable inductor circuits associated with the upper antenna may be tuned to provide coverage in at least two high-band frequency ranges of interest, whereas the variable capacitor circuits associated with the upper antenna may be tuned to provide coverage in at least two low-band frequency ranges of interest.