Antenna Coupler Slit Structure for Mobile Radio Testing
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Solution Overview
Problem
Conventional antenna couplers for mobile-radio devices face challenges in signal transmission due to the selective behavior of antennas operating in different frequency ranges, requiring multiple antennas and precise positioning, which is complicated by strong interactions with metallic objects in the near field.
Innovation Solution
A broadband antenna coupler with a flat, spiral-shaped slit structure on a printed-circuit board, featuring a microstripline configuration and resistive termination, which minimizes the influence of metallic objects and allows for efficient coupling across various frequencies using a single antenna, while maintaining compact geometric dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antennas are used in antenna couplers, then signal transmission can be achieved, but strong interactions occur with metallic objects in the near field, degrading performance
Solution Approach 1:
The patent introduces a slit structure as an intermediary element between the feed line and the mobile radio device. This slit structure in the ground plane acts as a mediator that couples signals to the device while minimizing direct interaction with metallic objects, thereby resolving the contradiction between achieving signal transmission and avoiding harmful near-field interactions
Solution Approach 2:
The patent changes the geometric parameters of the antenna structure by using a spiral-shaped slit pattern in the ground plane. This parameter change transforms the conventional antenna configuration into a broadband coupling structure that maintains signal transmission while reducing sensitivity to metallic object interactions through its distributed geometry
2Adaptability or versatility
If multiple antennas are arranged to cover different frequency ranges, then broadband operation is achieved, but the device complexity and positioning requirements increase
Solution Approach 1:
The patent implements a single slit structure that serves multiple functions across different frequency ranges. The spiral-shaped slit in the ground plane acts as a universal coupling element that operates broadband, eliminating the need for multiple separate antennas and their associated positioning requirements, thus achieving versatility without increasing device complexity
Solution Approach 2:
The patent merges multiple antenna functions into a single integrated slit structure. By combining what would traditionally require multiple discrete antennas into one continuous spiral slit pattern in the ground plane, the design achieves broadband frequency coverage while simplifying the overall device structure and reducing positioning complexity
3Adaptability or versatility
If a spiral-shaped antenna structure is used for broadband operation, then coupling properties are improved, but strong interactions with metallic objects in the near field still occur
Solution Approach 1:
The patent uses the slit structure as an intermediary that decouples the feed line from direct interaction with metallic objects. The spiral slit pattern in the ground plane serves as a mediator that provides broadband coupling capability while the slit configuration itself minimizes the harmful near-field interactions that would occur with conventional spiral antennas
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 achieves excellent coupling performance with reduced interaction from metallic objects, enabling broadband operation and minimizing the impact of near-field interactions, thus simplifying the testing process for mobile-radio devices.
Implementation Method 1
The antenna couplers use a capacitive or inductive coupling in order to transmit signals between the mobile-radio device and the test device connected to the antenna coupler for the implementation of the test
Implementation Method 2
The antenna couplers use a capacitive or inductive coupling in order to transmit signals between the mobile-radio device and the test device connected to the antenna coupler for the implementation of the test
Implementation Method 3
A strip conductor formed on the second side of the printed-circuit board facing away from the ground metallization serves to feed the slit structure acting as the coupling element. This strip conductor forms a microstripline with the remaining parts of the ground metallization formed on the first side
Data Source
AI summary
An antenna coupler for testing a mobile-radio device with a coupling element formed in a flat manner by strip conductors on a printed-circuit board and with a retaining device formed on a first side of the printed-circuit board for positioning a mobile-radio device in the vicinity of the coupling element. On the first side of the printed-circuit board, at least one slit structure is introduced into an ground metallization formed there. For feeding the slit structure serving as the coupling element, at least one stripline formed on the second side facing away from it forms a microstripline with the ground metallization remaining between the slit structure of the first side.