Single-Feed Multiband Antenna With Filtered Band Isolation
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Solution Overview
Problem
Traditional antenna systems for 5G devices cannot efficiently coexist with low-frequency antennas in the same clearance area due to size constraints and require separate feeding systems, limiting miniaturization and diversification of terminal hardware solutions.
Innovation Solution
A single-feeding-based antenna system is implemented, where a low-pass filter is used to isolate low-frequency and high-frequency antennas, allowing them to share the same feeding point and occupy minimal space, utilizing a compact microstrip resonance unit and asymmetric low-pass filter to achieve isolation and efficient operation across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a 5G array antenna and a low-frequency antenna are located in different clearance areas, then isolation between frequency bands is improved, but the terminal product size increases
Solution Approach 1:
The patent combines the 5G array antenna and low-frequency antenna into the same clearance area, sharing common structural components such as the substrate and feeding system. The array antenna elements are positioned on the substrate while the low-frequency antenna utilizes the ground plane and feeding lines, merging spatial occupation while maintaining functional independence through frequency-selective filtering.
Solution Approach 2:
A low-pass filter is introduced as an intermediary component between the feeding point and the array antenna elements. This filter mediates the signal distribution, allowing low-frequency signals to reach both the low-frequency antenna and array antenna while blocking high-frequency signals from the array antenna during low-frequency operation, thereby achieving isolation without spatial separation.
2Object-affected harmful factors
If a 5G array antenna and a low-frequency antenna use different feeding systems, then frequency band isolation is improved, but device complexity increases
Solution Approach 1:
The patent merges the feeding systems by using a single common feeding point and shared microstrip transmission lines for both the 5G array antenna and low-frequency antenna. The ground plane serves as a common reference for both antenna types, significantly reducing the number of separate feeding structures required while maintaining proper impedance matching and signal distribution.
Solution Approach 2:
A low-pass filter is placed at the common feeding point as an intermediary device that selectively directs signals to appropriate antenna paths. The filter allows low-frequency signals to pass to both antenna systems while blocking high-frequency signals from reaching the array antenna elements during low-frequency operation, achieving frequency band isolation through a single filtering component rather than separate feeding systems.
3Area of stationary object
If a single feeding point is used for both low-frequency and high-frequency antennas, then device miniaturization is improved, but frequency band isolation deteriorates
Solution Approach 1:
A low-pass filter is introduced as an intermediary component at the single feeding point to restore frequency band isolation. The filter selectively passes low-frequency signals to both the low-frequency antenna and array antenna elements, while blocking high-frequency signals from reaching the array antenna during low-frequency operation. This mediation enables single-point feeding to maintain both miniaturization benefits and frequency isolation requirements.
Solution Approach 2:
The low-pass filter changes the frequency parameter of the signals at the feeding point by selectively attenuating frequencies above its cutoff point. This parameter modification allows the single feeding point to serve dual purposes: supporting both low-frequency and high-frequency operations while maintaining proper isolation through frequency-selective signal transformation.
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 enables the coexistence of low-frequency and high-frequency antennas in the same clearance area, enhancing miniaturization and diversifying terminal hardware solutions by maintaining high isolation and performance across a wide bandwidth, with an echo loss bandwidth greater than 40% and minimal variation in gain and out-of-roundness.
Implementation Method 1
a low-pass filter is used to isolate low-frequency and high-frequency antennas
Implementation Method 2
simultaneously feeds a monopole and a slit through a single feed port via the microstrip line
Implementation Method 3
a single-fed printed multiband antenna for 4G/5G wireless communication systems is presented
Data Source
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Figure 3
Figure 4~5
AI summary
Provided in the present disclosure are an antenna, an antenna power supply method, a single-feeding-based method for combining antennas, and a terminal. The antenna comprises: a low-frequency antenna, a high-frequency antenna, and a filter. The filter is provided between the low-frequency antenna and the high-frequency antenna and isolates the low-frequency antenna and the high-frequency antenna. The low-frequency antenna and the high-frequency antenna use the same feeding point for feeding.