Sub-6G PCB Antenna Structure With Microstrip-Coupled L-Shaped Branches
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Solution Overview
Problem
Current antenna structures for Sub-6G mobile terminals require significant redesign of the printed circuit board (PCB) layout and are costly, making them less reliable and difficult to adapt to ultra-thin electronic devices, with complex structures and high costs.
Innovation Solution
An antenna structure comprising multiple L-shaped branches with microstrip lines and resonator elements, connected in series with zero-ohm resistors, allowing for better frequency band coverage with minimal changes to the PCB design, forming an Invert-F antenna structure with a parasitic unit, suitable for Sub-6G frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current antenna structures are used for Sub-6G, then frequency band coverage is achieved, but PCB layout redesign complexity increases significantly
Solution Approach 1:
The antenna structure is designed to perform multiple functions: it maintains compatibility with existing 2G/3G/4G frequency bands while simultaneously adding support for Sub-6G frequency bands. The L-shaped arm with microstrip line connections and resonator elements creates a multi-functional antenna system that operates across multiple frequency ranges without requiring separate antenna structures for each band.
Solution Approach 2:
The antenna is divided into distinct functional segments: the L-shaped arm structure, the microstrip line connections, and the resonator elements (inductors and capacitors). This segmentation allows each component to be optimized for specific frequency ranges while working together as an integrated system, enabling frequency band extension without complete PCB redesign.
2Adaptability or versatility
If current antenna structures are redesigned for Sub-6G, then frequency band coverage improves, but manufacturing cost increases
Solution Approach 1:
The design merges the existing antenna structure with additional L-shaped arms, microstrip lines, and resonator elements to create an integrated multi-band antenna. This combination approach allows the new Sub-6G functionality to be added to the existing 2G/3G/4G antenna system, avoiding the need for complete redesign and reducing manufacturing costs compared to implementing separate antennas for each frequency band.
Solution Approach 2:
The antenna structure utilizes parameter changes through varying the dimensions, positions, and electrical characteristics (inductance and capacitance values) of different components to optimize performance across multiple frequency bands. By adjusting these parameters, the same physical structure can resonate at different frequencies, enabling cost-effective multi-band operation.
3Ease of manufacture
If current antenna structures are used, then existing PCB layout is maintained, but reliability for Sub-6G is insufficient
Solution Approach 1:
Microstrip lines are introduced as intermediary transmission elements that connect the L-shaped arm structures to the ground and to each other. These microstrip lines serve as controlled impedance transmission paths that reliably transfer Sub-6G frequency signals while being easily integrable into existing PCB layouts, thus maintaining manufacturing simplicity while improving Sub-6G signal reliability.
Data Source
AI summary
An antenna structure, PCB and mobile terminal for Sub-6G. The antenna structure includes a first branch and a second branch. The first branch includes an L-shaped arm and a first longitudinal arm extending outwardly from the PCB. The first longitudinal arm is connected to the ground of the PCB. One end of the L-shaped arm is connected to the end of the first longitudinal arm. The second branch is L-shaped, and one end of the second branch is connected to the antenna feed point of the PCB. At least one microstrip line is connected between the first longitudinal arm and the second branch.