Antenna Structure With Segmented Metallic Housing
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Solution Overview
Problem
Metallic housings in wireless communication devices, such as mobile phones, shield and restrict antenna signals, degrading the operation of wireless communication devices, especially in frequency bands like LTE-A.
Innovation Solution
An antenna structure with a substrate and metallic member design that includes a matching circuit, coupling resistor, and switching circuit, allowing the antenna to operate effectively across multiple frequency bands by isolating the radiating and coupling portions with insulating material and adjusting gaps to ensure efficient signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal housing is used for wireless communication devices, then the structural strength and appearance are improved, but the antenna signal is shielded and restricted
Solution Approach 1:
The metal housing is divided into multiple segments: a first metal housing portion, a second metal housing portion, and a non-conductive material portion positioned between them. This segmentation allows the antenna to be electrically isolated from the metal housing while maintaining the overall structural integrity and aesthetic appearance of the device.
Solution Approach 2:
A non-conductive material portion is introduced as an intermediary element between the antenna and the metal housing portions. This non-conductive material acts as an electrical insulator that prevents signal shielding while allowing the metal housing to maintain its structural strength and appearance.
2Device complexity
If the antenna is located inside the metal housing, then the device integration is improved, but the signal transmission is degraded
Solution Approach 1:
The housing structure is segmented to create distinct functional zones: metal housing portions for structural support, non-conductive material portions for electrical isolation, and antenna portions for signal transmission. This segmentation enables the antenna to be integrated within the housing while maintaining signal quality.
Solution Approach 2:
Different materials with specific properties are used in different locations: conductive metal portions where structural strength is needed, non-conductive material portions where electrical isolation is needed for signal transmission, and antenna portions where electromagnetic radiation is required. This local optimization resolves the contradiction between integration and signal transmission.
3Adaptability or versatility
If the antenna structure uses multiple frequency band support, then the communication versatility is improved, but the structural complexity increases
Solution Approach 1:
The antenna structure is designed with a universal configuration that can operate across multiple frequency bands (e.g., LTE bands 1, 3, 7, 8, 26, and WLAN frequencies). The same basic antenna structure and housing design support diverse communication functions without requiring separate antenna systems for each frequency band, thereby avoiding excessive structural complexity.
Data Source
AI summary
An antenna structure includes a metallic member, a feed portion, and a coupling resistor. The metallic member defines a slot, a first gap, a second gap, and a third gap. The first gap and the second gap are connected with the slot and divide with the slot the metallic member into a first portion and a second portion. The second portion is grounded. The third gap is defined on the first portion and connected with the slot. The first portion is divided into a radiating portion and a coupling portion by the third gap. The coupling portion is spaced apart from the radiating portion. The feed portion is electrically connected to the radiating portion, and the coupling portion is grounded through the coupling resistor.