Antenna Voltage Null Points for Multi-Transceiver Isolation
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Solution Overview
Problem
Existing antenna systems face challenges in enabling simultaneous transmission and reception by multiple transceivers using a common antenna, particularly when these transceivers operate in non-overlapping frequency bands, as they often interfere with each other due to shared voltage points.
Innovation Solution
The design includes a circuit with a pair of transmitters and receivers connected to the antenna via specific feed-points located at voltage null points, ensuring that each transmitter and receiver can operate independently without loading or affecting each other, allowing for simultaneous transmission and reception in non-overlapping frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a same antenna is used for multiple transceivers to reduce implementation area and cost, then area and cost are reduced, but simultaneous transmission and reception becomes difficult due to interference between transceivers
Solution Approach 1:
The antenna is segmented into multiple independent feed-points, each serving a specific transceiver. The first feed-point connects to the first transceiver while the second feed-point connects to the second transceiver, allowing simultaneous operation without interference. This segmentation enables each transceiver to access the antenna independently at its designated feed-point.
Solution Approach 2:
Different feed-points on the antenna are assigned different electrical characteristics based on their location. The first feed-point is positioned at a voltage null point for the second transceiver's frequency band, while the second feed-point is positioned at a voltage null point for the first transceiver's frequency band. This local quality differentiation allows each transceiver to operate independently.
2Ease of manufacture
If multiple transceivers share a common antenna, then implementation cost is reduced, but interference occurs between transceivers operating in different frequency bands
Solution Approach 1:
The antenna structure itself acts as an intermediary that naturally isolates different frequency bands through its voltage null points. By positioning feed-points at these null points, the antenna structure provides inherent isolation between transceivers operating in different frequency bands without requiring additional filtering components.
3Adaptability or versatility
If transceivers operate in non-overlapping frequency bands using a shared antenna, then frequency spectrum utilization is improved, but mutual interference still occurs due to shared voltage points
Solution Approach 1:
The antenna is divided into multiple feed-points that are electrically isolated from each other through the voltage null point positioning. This segmentation allows each transceiver to operate in its designated non-overlapping frequency band without mutual interference, as signals at one frequency band create voltage nulls at the feed-points intended for other frequency bands.
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 configuration enables simultaneous and interference-free operation of multiple transceivers using the same antenna, reducing implementation area and cost while supporting diverse signal types like NFC and FM signals.
Implementation Method 1
The first pair of feed-points is located at a voltage null point of the antenna with respect to the second pair of feed-points. The second pair of feed-points is located at a voltage null point of the antenna with respect to the first pair of feed-points.
Data Source
AI summary
A circuit includes an antenna, and a pair of transceivers. A first transceiver in the pair is connected to the antenna via a first pair of feed-points, and is designed to transmit and receive signals in a first band of frequencies. A second transceiver in the pair is connected to the antenna via a second pair of feed-points, and is designed to transmit and receive signals in a second band of frequencies. The first band and the second band are non-overlapping frequency bands. The first pair of feed-points is located at a voltage null point of the antenna with respect to the second pair of feed-points. The second pair of feed-points is located at a voltage null point of the antenna with respect to the first pair of feed-points. The first transceiver and the second transceiver are, thus, enabled to simultaneously transmit and/or receive corresponding signals using the same antenna.