Antenna Structure With Insulating Substrate in Metallic Housing
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Solution Overview
Problem
Metallic housings in wireless communication devices often shield antenna signals, degrading device performance and affecting the integrity and aesthetics of the device due to slots and gaps.
Innovation Solution
An antenna structure with a metallic member, radiating sections, and matching circuits that utilize insulating materials to isolate radiating sections from the metallic housing, allowing for efficient signal transmission across various frequency bands without gaps or slots on the backboard, and adjustable impedance switching for frequency band adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the antenna is located in the metal housing, then the device structure is simplified and aesthetics are improved, but the antenna signals are shielded by the metal housing degrading wireless communication performance
Solution Approach 1:
The patent introduces an insulating substrate as an intermediary layer between the antenna and the metal housing. This substrate with dielectric constant 3.0-10.0 and loss tangent 0.005-0.05 acts as a mediator that prevents signal shielding while maintaining structural integrity. The insulating material allows the antenna to be embedded in the metal housing without direct metal contact, resolving the contradiction between structural simplicity and communication performance.
2Reliability
If slots or gaps are defined on the metallic backboard, then antenna signals can be transmitted, but the integrity and aesthetics of the metallic backboard are affected
Solution Approach 1:
The patent extracts the signal transmission function from the metal backboard by placing the antenna and insulating substrate assembly on the inner surface of the backboard. This allows the metal backboard to remain intact without slots or gaps, as the antenna embedded in the insulating material can transmit signals through the backboard's natural structure, eliminating the need for openings while maintaining both aesthetics and signal transmission.
3Reliability
If insulating materials are used to isolate radiating sections from the metallic housing, then signal shielding is prevented, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into the insulating substrate: it provides electrical isolation between the antenna and metal housing, serves as a mounting surface for the antenna, acts as a structural support layer, and functions as part of the antenna's radiating structure. By combining these functions into a single integrated component rather than separate parts, the solution prevents signal shielding without significantly increasing overall device complexity.
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
The antenna structure enhances signal integrity and efficiency across multiple frequency bands, including LTE-A, GPS, and WiFi, while maintaining the device's aesthetic and structural integrity by eliminating gaps and slots on the backboard.
Implementation Method 1
when the antenna is located in the metal housing, the antenna signals are often shielded by the metal housing
Implementation Method 2
Antennas are also important components in wireless communication devices for receiving and transmitting wireless signals at different frequencies
Data Source
AI summary
An antenna structure includes a metallic member. The metallic member includes a front frame, a backboard, and a side frame. The side frame defines a slot. The front frame defines a first gap and a second gap. The front frame between the first gap and the second gap forms a radiating section. Current enters the radiating section from the first feed portion, the current flows through the radiating section and towards the first gap and the first radiating portion, thus activating radiating signals in a first frequency band; the current flows through the radiating section and towards the first ground portion, thus activating radiating signals in a second frequency band; the current flows through the radiating section and towards the second gap and the second radiating portion, thus activating radiation signals in a third different frequency band. A wireless communication device using the antenna structure is provided.