Cross-Finger Antenna Decoupling for Compact Multi-Band Isolation
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Solution Overview
Problem
In multi-band antennas, mutual interference between antennas operating at different frequency bands is a challenge, particularly in compact designs for 4G or 5G communication networks, where existing solutions either require significant space or are difficult to adjust for specific frequency bands.
Innovation Solution
A decoupling apparatus with a cross-finger portion and conductive lines is integrated into the antenna's feeding part, acting as an equivalent capacitor and inductor to block specific frequency bands, reducing interference by adjusting capacitance and inductance to inhibit the superposition of lower frequency signals on higher frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multi-band antennas are integrated into a compact size for 4G or 5G communication networks, then the antenna meets space requirements, but mutual interference among different frequency bands increases
Solution Approach 1:
A decoupling apparatus is introduced as an intermediary component between antennas operating at different frequency bands. This apparatus includes a first decoupling unit coupled to a first antenna and a second decoupling unit coupled to a second antenna, where each decoupling unit comprises conductive elements configured to reduce mutual coupling. The decoupling apparatus acts as a mediator that reduces harmful electromagnetic coupling between antennas while maintaining compact antenna integration for 4G/5G networks.
2Object-affected harmful factors
If existing decoupling solutions are used to reduce mutual interference, then interference is reduced, but the device complexity or space requirements increase
Solution Approach 1:
The decoupling apparatus is integrated with the antenna feeding structures by coupling the first decoupling unit to the first antenna and the second decoupling unit to the second antenna through shared conductive elements and ground connections. This merging approach reduces device complexity by combining decoupling functions with existing antenna feed networks rather than adding separate standalone decoupling components.
Solution Approach 2:
The decoupling units utilize adjustable conductive elements with varying geometries (different lengths, widths, and spacing) to change electromagnetic parameters such as capacitance and inductance. By adjusting these physical parameters of the conductive elements, the decoupling apparatus can be optimized for specific frequency bands without requiring complex active control circuits or multiple discrete components.
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 approach effectively reduces interference among different frequency bands, maintaining good performance and improving antenna gain without the need for increased space, allowing for compact multi-band antenna designs.
Implementation Method 1
a cross-finger portion coupled to the body and configured to change a capacitance of the decoupling apparatus, the cross-finger portion comprising: a first plurality of fingers extending along a first direction; and a second plurality of fingers extending along the first direction
Implementation Method 2
acting as an equivalent capacitor and inductor to block specific frequency bands, reducing interference
Data Source
AI summary
In one embodiment, the decoupling apparatus for an antenna, includes a body and a cross-finger portion coupled to the body and configured to change a capacitance of the decoupling apparatus. The cross-finger portion includes a first plurality of fingers extending along a first direction; and a second plurality of fingers extending along the first direction. At least one of the second plurality of fingers is provided between adjacent two fingers of the first plurality of fingers, and at least one of the first plurality of fingers is provided between adjacent two fingers of the second plurality of fingers.