Filtered Radiation Element Layout for Compact Multi-Band Antennas
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Solution Overview
Problem
Designing base station antennas for wide bandwidths like the sub-6 GHz band is challenging due to interference between radiation elements operating at different frequency bands, which affects isolation and communication network performance, especially in compact antenna designs where space is limited.
Innovation Solution
A radiation element with a filter configuration between its arms and power feeders, including a shunt filter with specific trace configurations, is used to minimize interference with high-frequency elements, allowing for better coexistence and reduced interference between low-frequency and high-frequency radiating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between two adjacent radiating elements operating in different frequency bands is increased, then the isolation performance between two adjacent radiating elements is improved, but the width or length of the antenna is increased
Solution Approach 1:
A reflector plate is introduced as an intermediary component between the low-frequency radiation element and the high-frequency radiating element. The reflector plate redirects high-frequency signals away from the low-frequency element, preventing interference while allowing the elements to be positioned closer together. This mediator enables improved isolation performance without increasing the overall antenna dimensions.
2Area of stationary object
If multiple radiating elements working in different frequency bands are integrated into one antenna, then the space utilization is improved, but the isolation between multiple radiating elements is degraded
Solution Approach 1:
The reflector plate serves as a mediator that enables multiple radiating elements to coexist in a compact antenna structure. By positioning the reflector plate between elements operating at different frequencies, it selectively blocks high-frequency signals from interfering with low-frequency elements while maintaining the integrated, space-efficient design.
Solution Approach 2:
The solution moves the isolation mechanism from the horizontal plane (increasing distance between elements) to the vertical dimension (positioning the reflector plate below the radiating elements). This dimensional shift allows compact integration while maintaining isolation through spatial separation in the vertical direction.
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 reduces interference between radiation elements, improving the coexistence and radiation performance of multi-band antennas, enabling more compact and efficient antenna designs without adverse effects on high-frequency elements.
Implementation Method 1
a filter, configured between the two or more radiation arms and the two or more power feeders... the high-frequency current formed by the high-frequency signal at the radiation element may be filtered out
Implementation Method 2
a radiation element for the low-frequency band... the radiation element may be combined with the high-frequency radiating element
Data Source
AI summary
A radiation element includes: two or more radiation arms; two or more power feeders for respectively feeding the two or more radiation arms; and a filter, configured between the two or more radiation arms and the two or more power feeders. An antenna includes a first radiation unit that includes the radiation element, a second radiation unit that includes a high-frequency radiating element, and a reflection plate. The first radiation unit and the second radiation unit are configured on the reflection plate. In a direction perpendicular to the reflection plate, the radiation element and the high-frequency radiating element at least partially overlap.