Antenna Capacitive Coupling for Isolation in Overlapping Bands
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional communication devices with multiple antennas experience mutual interference when transmitting and receiving radio waves in the same frequency band, leading to deteriorated communication performance, and existing solutions require significant space or complex structures to mitigate this interference.
Innovation Solution
The communication device incorporates a first and second antenna with a body part and a branch part that resonates in overlapping frequency bands, featuring capacitive coupling between the antennas to improve isolation without the need for additional components or increased space, by utilizing a configuration where the branch parts of each antenna are capacitively coupled with a short interval between their coupling parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the physical distance between antennas is increased to prevent mutual interference, then isolation between antennas is improved, but device space consumption increases
Solution Approach 1:
A ground pattern is introduced as an intermediary element between the first and second antennas. This ground pattern acts as a mediator to suppress mutual interference between the antennas operating in overlapping frequency bands, enabling improved isolation without increasing the physical distance between antennas, thereby saving device space.
2Reliability
If stub structures are added between antennas to improve isolation, then interference between antennas is suppressed, but device structure becomes complicated
Solution Approach 1:
The ground pattern is merged with the existing antenna structures and integrated into the circuit board layout. This combination approach allows the interference suppression function to be achieved without adding separate stub structures, thereby simplifying the overall device structure while maintaining effective isolation between antennas.
3Adaptability or versatility
If multiple antennas operate in overlapping frequency bands, then communication versatility is improved, but mutual interference occurs deteriorating communication performance
Solution Approach 1:
The ground pattern serves as a mediator that enables multiple antennas to operate in overlapping frequency bands without significant mutual interference. This intermediary structure allows the device to support multiple communication standards (Bluetooth, Wi-Fi, etc.) while maintaining reliable communication performance for each standard.
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 enhances isolation performance between antennas, particularly in the target frequency band, while allowing the antennas to be closer together, thus saving space and simplifying the device structure, as demonstrated by improved isolation performance in simulations.
Implementation Method 1
Each of the branch part of the first antenna and the branch part of the second antenna includes a coupling part, the coupling part in the first antenna and the coupling part in the second antenna being disposed with an interval left to cause capacitive coupling
Implementation Method 2
Each of the first antenna and the second antenna includes a body part that resonates in a frequency band that is a target of the wireless communication with the each of the first antenna and the second antenna
Data Source
AI summary
A communication device includes a first antenna and a second antenna that perform wireless communication in frequency bands that at least partly overlap each other, in which each of the first antenna and the second antenna includes a body part that resonates in a frequency band that is a target of the wireless communication with the each of the first antenna and the second antenna, and a branch part that branches from the body part. Each of the ranch part of the first antenna and the branch part of the second antenna includes a coupling part, the coupling part in the first antenna and the coupling part in the second antenna being disposed with an interval left to cause capacitive coupling.