Door Frame Antenna Blocking Member for Signal Reflection
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Solution Overview
Problem
Electronic devices placed on door frames, particularly those made of metal, face performance degradation in detecting user location due to signal reflection, leading to inaccurate angle and distance measurements.
Innovation Solution
Incorporating an electric-wave blocking member between the antenna and the door frame, and using asymmetrical antenna structures to prevent signal interference and enhance signal clarity, allowing for accurate user location detection regardless of the door material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic device is disposed on a metal door frame, then the device can detect user location using signal transmission, but the detection performance is degraded due to signal reflection by the metal material
Solution Approach 1:
An electric wave blocking member is introduced as an intermediary between the antenna and the metal door frame. This blocking member prevents direct contact between the antenna and the reflective metal surface, thereby eliminating the harmful signal reflection while allowing the antenna to maintain its detection function. The blocking member acts as a mediator that isolates the antenna from the adverse environmental condition (metal surface).
Solution Approach 2:
The harmful reflective surface (metal door frame) is effectively removed from the antenna's operational environment by positioning the antenna at a distance and introducing the blocking member. This extracts the adverse factor (metal reflection) from the signal path, allowing the antenna to operate in an electromagnetically favorable environment despite being mounted on metal.
2Volume of moving object
If the antenna is disposed close to the door frame to save space, then the device structure is compact, but the signal clarity is reduced due to reflection from the door frame material
Solution Approach 1:
The electric wave blocking member serves as a space-efficient intermediary that fits between the antenna and the door frame. It maintains the compact structure by allowing close positioning while simultaneously blocking the harmful reflections, thus resolving the contradiction between compactness and signal clarity.
Solution Approach 2:
The problem is solved by adding a dimensional element (the blocking member extending between the antenna and door frame) rather than increasing the overall device volume. This creates a three-dimensional arrangement where the blocking member occupies the space between components, providing reflection protection without increasing the device's external dimensions.
3Device complexity
If a single antenna is used for signal transmission and reception, then the device structure is simple, but the detection accuracy is insufficient due to signal reflection interference
Solution Approach 1:
The electric wave blocking member is a simple structural addition that works with the single antenna to eliminate reflection interference. It enables the simple single-antenna design to achieve accurate detection by removing the harmful reflective paths, thus maintaining simplicity while improving precision.
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 solution effectively blocks signal reflections from the door frame and improves antenna performance, enabling precise user location tracking and mode changes based on inside or outside the building, thus maintaining consistent operation across different materials.
Implementation Method 1
a third signal reflected by the door frame
Implementation Method 2
an electric-wave blocking member that is disposed between the back plate and the second antenna and that blocks a third signal reflected by the door frame
Data Source
AI summary
An electronic device disposed on a door frame includes a back plate attached to the door frame, a housing coupled to the back plate, a first antenna that transmits or receives a signal having a first wavelength with an external electronic device, a second antenna that is disposed closer to the back plate than the first antenna and that transmits or receives a signal having the first wavelength with the external electronic device, an electric-wave blocking member that is disposed between the back plate and the second antenna and that blocks a signal reflected by the door frame, and at least one processor operatively connected with the first antenna and the second antenna. The first antenna and the second antenna are disposed inside the housing, and an antenna pattern of the second antenna is different from an antenna pattern of the first antenna.