Shared-Radiator Antenna Layout for Signal Isolation and Sensing
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Solution Overview
Problem
Existing single antennas with shared radiators face challenges in isolating high and low frequency signals without affecting distance detection capability, as ceramic capacitors used for signal separation have capacitance values close to the upper limit of detectable values, reducing the maximum sensing distance.
Innovation Solution
A single antenna with a shared radiator employs a distributed capacitor structure between the ground and radiator units, which has a smaller conductor length or area near the radiator, minimizing capacitance and avoiding interference with distance sensing, while allowing for high and low frequency signal separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic capacitor is used to separate high and low frequency signals, then signal isolation is improved, but the sensing distance is reduced
Solution Approach 1:
The capacitor structure is segmented into two distinct parts: a first capacitor part connected to the radiator unit with small conductor area for low-frequency signal coupling, and a second capacitor part connected to the feed-in unit with large conductor area for high-frequency signal isolation. This segmentation allows each part to perform its specific function optimally without interfering with the other.
Solution Approach 2:
Different parts of the capacitor structure are designed with different conductor areas to create local quality differences. The first capacitor part has a small conductor area near the radiator to minimize capacitance and preserve sensing distance, while the second capacitor part has a large conductor area near the feed-in unit to provide sufficient isolation for high-frequency signals.
2Reliability
If a capacitor with large conductor area is used for signal separation, then high frequency isolation is improved, but the capacitance value increases affecting distance detection
Solution Approach 1:
The capacitor is divided into two separate capacitor parts with different conductor areas. The first capacitor part has a small conductor area specifically designed to minimize capacitance value and avoid affecting distance detection, while the second capacitor part has a large conductor area to provide adequate high-frequency isolation.
Solution Approach 2:
The capacitor structure implements local quality by having different conductor areas in different locations. The region near the radiator unit has small conductor area to maintain low capacitance for accurate distance sensing, while the region near the feed-in unit has large conductor area to ensure proper high-frequency signal isolation.
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
This solution increases the sensing distance by 20% to 60% without requiring additional components, reducing overall volume and cost, and provides a wider antenna bandwidth compared to traditional ceramic capacitors.
Implementation Method 1
The ground unit forms a distributed capacitor structure between the ground unit and the radiator unit
Implementation Method 2
the sensing module determines the distance by detecting the change in a capacitance of the antenna radiator
Data Source
AI summary
A single antenna with a shared radiator includes a radiator unit, a feed-in unit, a sensing module and a ground unit. The feed-in unit is coupled with the radiator unit and used to send or receive radio frequency signals together with the radiator unit. The sensing module is connected to the radiator unit and used for sensing a distance between the radiator unit and an object by the radiator unit. A distributed capacitor structure is formed between the ground unit and the radiator unit.