PCB Antenna Split and Slot for Multi-Band Resonance
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Solution Overview
Problem
Current single frequency inverted-F antennas (IFA) combined with printed circuit boards are not suitable for mobile terminals that need to operate in multiple frequency bands such as Bluetooth-wireless local area network (BT-WLAN), Global Positioning System (GPS), and Long Term Evolution (LTE), as they lack the capability to efficiently work across different frequency bands.
Innovation Solution
A printed circuit board antenna design featuring a split and a perpendicular slot on a copper coating, forming two separate antennas with different resonance loops, allowing the antenna to operate in two distinct frequency bands simultaneously, with optional inductors to adjust resonance frequencies and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single frequency inverted-F antenna (IFA) combined with PCB is used, then the antenna has compact size and sufficient bandwidth, but it cannot work in multiple frequency bands simultaneously
Solution Approach 1:
The copper coating on the PCB is segmented by introducing a split and a slot, dividing it into two separate antenna elements (first antenna and second antenna) with different lengths. This segmentation allows each antenna element to resonate at different frequencies, enabling multi-band operation while maintaining a compact PCB-based structure.
Solution Approach 2:
Different regions of the copper coating are given different local qualities by creating antenna elements of different lengths. The first antenna and second antenna have different effective lengths, which determines their respective resonance frequencies. This local differentiation in electrical length allows the single PCB antenna structure to support multiple frequency bands.
2Volume of moving object
If the antenna size is reduced for miniaturization, then the terminal becomes more compact, but the resonance frequency control becomes more difficult
Solution Approach 1:
The resonance frequencies of the two antenna elements are precisely controlled by adjusting their respective lengths as key parameters. By optimizing the length of the first antenna and second antenna, the design achieves accurate resonance frequency control for multiple bands while maintaining a compact overall antenna volume suitable for miniaturized terminals.
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
Enables a mobile terminal to effectively work in multiple frequency bands like BT-WLAN and GPS, while also facilitating miniaturization by adjusting antenna lengths and inductance to maintain resonance frequencies, thus meeting the requirements of compact size and multi-band operation.
Implementation Method 1
The feedpoint is configured to, together with the first antenna and the second antenna, form a first resonance loop and a second resonance loop. Resonance frequencies of the first resonance loop and the second resonance loop are different.
Data Source
AI summary
A printed circuit board antenna includes a printed circuit board and a feedpoint that is disposed on the printed circuit board. A copper coating is disposed on the printed circuit board. A split is disposed on the copper coating on the printed circuit board. The split is connected to a board edge of the printed circuit board. A slot perpendicular to the split is disposed on the copper coating on the printed circuit board. The slot is connected to the split. The copper coating at two sides of the split forms a first antenna and a second antenna. The feedpoint is configured to, together with the first antenna and the second antenna, form a first resonance loop and a second resonance loop. Resonance frequencies of the first resonance loop and the second resonance loop are different.