Adjustable Gain Antenna via Switched Conductive Frame
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Solution Overview
Problem
Current portable radio communication devices for 'hands-free' vehicle access have a fixed antenna gain, which is limited by the device's geometry and electrical consumption, leading to suboptimal performance in countries with less stringent radio-frequency transmission power regulations, resulting in reduced detection reliability of radio-frequency waves.
Innovation Solution
A portable radio communication device with an adjustable total gain, featuring a conductive metal frame with multiple sections and switching means that can be electromagnetically coupled with the antenna to increase the effective area and gain, allowing for dynamic adjustment of the total gain through controlled switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna gain is increased to improve detection reliability in countries with less stringent regulations, then the detection reliability improves, but the device geometry and electrical consumption constraints prevent further gain increase
Solution Approach 1:
The patent applies the dynamics principle by making the antenna gain adjustable rather than fixed. The conductive frame sections can be dynamically connected or disconnected from the antenna through switching means, allowing the total gain to be adapted based on the regulatory environment. This resolves the contradiction by enabling the system to achieve higher detection reliability when needed while maintaining compliance in other regions.
Solution Approach 2:
The patent segments the conductive frame into multiple separate sections that can be independently connected to the antenna. This segmentation allows selective activation of frame sections to achieve different gain levels, enabling adaptation to various regulatory requirements while maintaining a compact device geometry.
2Power
If the antenna effective area is increased to improve gain, then the total gain increases, but the device geometry constraints limit the available space
Solution Approach 1:
The patent implements the nested doll principle by placing the conductive frame sections within or around the existing antenna structure. The frame sections are positioned to electromagnetically couple with the antenna without significantly increasing the physical footprint of the device, thereby increasing effective area while maintaining compact geometry.
Solution Approach 2:
The patent applies dimensionality change by utilizing the three-dimensional space around the antenna more effectively. The conductive frame sections are arranged in specific spatial configurations that maximize electromagnetic coupling and effective area without increasing the device's planar footprint, thus resolving the contradiction between gain and geometry.
3Power
If the gain amplifier maximum gain is increased to improve total gain, then the total gain can be higher, but the electrical consumption increases
Solution Approach 1:
The patent extracts the gain adjustment function from the electronic gain amplifier and implements it through the electromagnetic coupling of conductive frame sections. This passive electromagnetic approach to gain adjustment eliminates the need for high-power amplification, significantly reducing electrical consumption while still achieving the required total gain levels.
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 adjustable gain configuration enhances the detection reliability of radio-frequency waves, improving the 'hands-free' access system's performance across different regulatory environments without modifying the antenna's size or increasing electrical consumption.
Implementation Method 1
switching means, having a closed state in which the two sections are electrically connected to each other, and an open state in which the two sections are disconnected from each other... by connecting the two sections with each other, the latter are electromagnetically coupled to the antenna, and they increase the effective area of said antenna and consequently the total gain of the portable device
Data Source
AI summary
A portable radio communication device D′ with adjustable total gain and an associated gain adjustment method via a conductive metal frame C situated at the periphery of the portable device D′. For this purpose, the frame C includes several metal sections P1, P2, P3, P4 not connected to each other and separated from each other by openings F1, F2, F3, F4. Switching elements S1, S2, S3, S4 make it possible to electrically connect two consecutive sections in such a way as to modify the length of the sections and to modify the electromagnetic coupling between the antenna A and the metal frame C. The modification of coupling causes a modification of the value of the resultant gain Gr of the antenna A. A calibration step makes it possible to select the sections to be connected together in order to obtain the desired resultant gain Gr of the antenna A.