Slotted Mobile Terminal Antennas for Multi-Band Isolation
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Solution Overview
Problem
Existing mobile terminal antennas face challenges in efficiently transmitting and receiving radio signals across multiple frequency bands due to complex structures and difficulties in independently controlling parameter values such as resonant frequency, bandwidth, and gain, which complicates their miniaturization and integration into portable devices.
Innovation Solution
The design incorporates two antenna devices with conductive members featuring slits and feeding portions, where the length of the slots and feeding extensions are optimized to λ/4 or λ/8 relative to the wavelength of the center frequency, allowing for impedance matching and efficient operation across different frequency bands without the need for baluns or diplexers, and are positioned to minimize mutual coupling and hand-effect interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-frequency band antennas are designed to operate across multiple frequency bands, then the adaptability and versatility of the mobile terminal is improved, but the device complexity and structural complexity increase significantly
Solution Approach 1:
The patent implements multi-frequency band operation by designing a single antenna structure that can operate across multiple frequency bands (e.g., LTE bands 1, 3, 7, 8, 18, 19, 20, 21, 25, 26, 28, 38, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 53, 54, 55, 56, 57, 58, 59, 60, 66, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100). The antenna structure includes multiple radiating elements with different lengths and configurations, allowing it to resonate at multiple frequency bands simultaneously, thereby achieving multi-functionality without requiring separate antennas for each band
Solution Approach 2:
The patent employs a nested structure where multiple radiating elements are arranged in a compact configuration. The antenna includes an first radiating element, an second radiating element nested near the first, and additional elements nested within the terminal body. This nesting approach allows multiple frequency-band-capable elements to coexist in a small space, reducing overall device complexity while maintaining multi-frequency operation capability
2Adaptability or versatility
If antenna structures are optimized for multi-frequency operation, then the adaptability is improved, but the length and volume of the antenna device increase
Solution Approach 1:
The patent transitions from traditional linear antenna arrangements to a three-dimensional nested configuration. Multiple radiating elements are positioned at different spatial locations and orientations within the terminal body, utilizing vertical, horizontal, and diagonal dimensions. This dimensional approach allows the antenna to achieve multi-frequency operation without proportionally increasing the overall length or volume of the device
Solution Approach 2:
The antenna structure implements nested radiating elements where smaller elements are positioned within or adjacent to larger elements. The first radiating element has a first length, the second radiating element has a second length, and additional elements are nested within the terminal body, creating a compact multi-scale structure that accommodates multiple frequency bands without excessive dimensional growth
3Productivity
If multiple antenna devices are disposed in adjacent manner to achieve multi-frequency operation, then the productivity and integration are improved, but mutual coupling and hand-effect interference increase
Solution Approach 1:
The patent employs asymmetric positioning and orientation of adjacent antenna elements to reduce mutual coupling. The first and second antenna devices are disposed at different angles and positions relative to each other, with non-uniform spacing and varied radiation patterns. This asymmetric configuration minimizes electromagnetic interference between adjacent elements while maintaining compact integration
Solution Approach 2:
The patent applies different structural characteristics to different regions of the antenna system. Each antenna element has locally optimized properties such as varying lengths, widths, and orientations tailored to its specific frequency band requirements. This local optimization allows adjacent elements to operate with reduced mutual coupling while maintaining overall system integration efficiency
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 configuration enhances antenna efficiency, reduces mutual coupling, and allows for a more compact design by optimizing radiation patterns and impedance matching across multiple frequency bands, thereby improving the overall performance and miniaturization of mobile terminal antennas.
Implementation Method 1
the length of the slots and feeding extensions are optimized to λ/4 or λ/8 relative to the wavelength of the center frequency, allowing for impedance matching and efficient operation across different frequency bands
Data Source
AI summary
A mobile terminal comprises: a terminal body; and a first antenna device and a second antenna device disposed at one side of the terminal body in an adjacent manner, and formed to operate at different frequency bands, wherein the first antenna device and the second antenna device are provided with conductive members each having a slit at one side thereof, and wherein the conductive members form part of an appearance of the terminal body.