Tapered Dielectric Patch Antenna for Wristwatch Sensitivity
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Solution Overview
Problem
Conventional wristwatch-type wireless terminals face challenges with patch antenna degradation due to wrist attachment, leading to insufficient sensitivity characteristics due to space constraints and design limitations.
Innovation Solution
A patch antenna design with a dielectric body that increases in cross-sectional area from one end to another, featuring a radiation element with adjusted side lengths based on the frequency and effective permittivity, and an earth conductor, allowing for efficient space utilization and enhanced sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a patch antenna is mounted in a band attaching portion to avoid wrist attachment influence, then the antenna is less influenced by the wrist, but the available space is limited due to the tapered shape of the band attaching portion
Solution Approach 1:
The patch antenna is nested within the band attaching portion, utilizing the available space efficiently. The antenna structure is contained within the tapered cavity of the band attaching portion, maximizing space utilization while maintaining antenna performance.
Solution Approach 2:
The dielectric body transitions from a conventional uniform thickness to a variable thickness structure, with the top surface forming an inclined plane. This dimensional change allows the antenna to better fit the tapered band attaching portion while maintaining adequate radiation element area for sensitivity.
2Ease of operation
If the lengths of sides and thickness of the patch antenna are constrained by the smallest dimension of the band attaching portion, then the antenna fits within the space, but the volume is reduced resulting in insufficient sensitivity characteristics
Solution Approach 1:
The dielectric body has different thicknesses at different locations, with the top surface forming an inclined plane. This allows the antenna to have greater thickness in regions where space permits, increasing the volume and sensitivity characteristics while still fitting within the tapered band attaching portion constraints.
3Ease of manufacture
If a conventional patch antenna with uniform thickness is used, then the manufacturing is simple, but the volume is limited by the smallest height of the band attaching portion
Solution Approach 1:
The dielectric body thickness varies dynamically along the height direction, transitioning from a uniform thickness to a variable thickness structure. The top surface forms an inclined plane that adapts to the tapered shape of the band attaching portion, allowing the antenna to maximize volume within the available space.
Data Source
AI summary
A patch antenna includes a dielectric body, radiation element, earth conductor and feed member. The dielectric body increases in cross-sectional area from a first end toward a second end thereof. The radiation element is disposed on a surface of the dielectric body, and each side of the radiation element has a length adjusted based on the frequency of a radio wave to be received and the effective permittivity of the dielectric body. The earth conductor is disposed on the bottom surface of the dielectric body. The feed member is electrically connected to the radiation element.