Multiband Antenna Structure With Segmented Slots And Stacked Dielectrics
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Solution Overview
Problem
Designing a small-size, multiband antenna that effectively covers various wireless communication frequency bands without degrading communication quality is a critical challenge, as existing antennas often have insufficient bandwidth.
Innovation Solution
The proposed antenna structure incorporates a radiation metal element with specific slots and openings, a metal loop, and dielectric layers with different dielectric constants, along with feeding metal elements and a via metal element, to achieve a wide bandwidth and circularly-polarized radiation pattern, supporting frequency intervals from 1117 MHz to 1585 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna design is used, then the structure is simple, but the bandwidth is insufficient to cover multiple frequency bands
Solution Approach 1:
The radiation element is divided into multiple segments including a first radiation element with a first slot and a second radiation element with a second slot. These segmented elements are arranged in specific spatial relationships to independently resonate at different frequency bands, enabling multiband operation while maintaining a relatively compact overall structure.
Solution Approach 2:
The antenna transitions from planar to three-dimensional configuration by stacking radiation elements at different heights above the ground plane. The first and second radiation elements are positioned at different vertical levels, creating a spatially distributed structure that enables multiple resonance modes and expands the operational bandwidth across different frequency bands.
2Volume of moving object
If the antenna size is reduced, then the device becomes more compact, but the bandwidth and radiation efficiency deteriorate
Solution Approach 1:
The antenna structure embeds multiple functional elements within a compact footprint. The first and second radiation elements are nested in a vertical stacking arrangement, with each element contributing to different frequency bands. This nested configuration allows the antenna to achieve multiband functionality in a reduced volume compared to conventional planar designs.
Solution Approach 2:
By utilizing the vertical dimension through stacked radiation elements at different heights, the antenna achieves expanded bandwidth functionality without increasing the horizontal footprint. The three-dimensional arrangement allows multiple resonance modes to coexist in a compact planar area, effectively decoupling size from bandwidth performance.
3Adaptability or versatility
If multiple frequency bands are covered, then the adaptability increases, but the isolation between bands deteriorates
Solution Approach 1:
The vertical stacking of radiation elements at different heights creates spatial separation between frequency bands. This three-dimensional arrangement provides natural isolation between bands by distributing current paths in different spatial locations, reducing mutual coupling and interference between adjacent frequency bands while maintaining multiband coverage.
4Ease of manufacture
If the antenna structure is simplified, then the manufacturing is easier, but the radiation efficiency decreases
Solution Approach 1:
The radiation element is divided into multiple segments including a first radiation element with a first slot and a second radiation element with a second slot. These segmented elements are arranged in specific spatial relationships to independently resonate at different frequency bands, enabling multiband operation while maintaining a relatively compact overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design results in a compact, multiband antenna with enhanced bandwidth, isolation, and radiation efficiency, suitable for diverse communication devices, including those using 2G, 3G, LTE, Wi-Fi, and Bluetooth systems, while maintaining high communication quality.
Implementation Method 1
The first dielectric layer and the second dielectric layer have different dielectric constants
Implementation Method 2
a radiation metal element, a first feeding metal element, a second feeding metal element, a metal loop
Data Source
AI summary
An antenna structure includes a radiation metal element, a first feeding metal element, a second feeding metal element, a metal loop, a ground metal element, a first dielectric layer, a second dielectric layer, and a via metal element. The radiation metal element has a first slot, a second slot, a third slot, and a fourth slot, which surround a first opening, a second opening, a third opening, and a fourth opening. The first feeding metal element extends into the first opening. The second feeding metal element extends into the second opening. The first dielectric layer is disposed between the radiation metal element and the metal loop. The second dielectric layer is disposed between the metal loop and the ground metal element. The via metal element couples a first connection point on the radiation metal element to a second connection point on the ground metal element.