Monopole Antenna PCB Placement for Bandwidth
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Solution Overview
Problem
Existing built-in antennas in mobile communication devices suffer from limited bandwidth, gain, and un-roundness of the horizontal pattern, leading to poor user experience due to their design constraints, particularly when compared to external antennas.
Innovation Solution
A mobile communication antenna device is designed with a monopole antenna placed on one side of a printed circuit board, where the distance between the antenna and the central position is less than a threshold, forming a dipole antenna with a mirror effect, which enhances gain and bandwidth, and includes a second metal sheet as a parasitic unit to broaden the frequency coverage without increasing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a printed antenna is placed at the edge of a PCB on the same horizontal plane, then the device complexity is reduced and ease of manufacture is improved, but the bandwidth, gain, and un-roundness of the horizontal pattern deteriorate due to small vertical polarization component and large horizontal polarization component
Solution Approach 1:
The patent transitions the antenna from a planar 2D configuration to a 3D structure by making the radiating element vertical to the ground plane. This dimensional change creates significant vertical polarization component while suppressing horizontal polarization, thereby improving bandwidth, gain, and pattern un-roundness while maintaining manufacturing simplicity through PCB integration.
2Reliability
If a monopole antenna or PIFA is placed at the edge of a PCB with a passive parasitic unit, then the bandwidth is broadened to cover multiple frequency bands, but the device complexity increases and the antenna size increases
Solution Approach 1:
The patent combines the radiating element and ground plane into a single integrated PCB structure, eliminating the need for separate passive parasitic units. The ground plane itself serves as the reflective surface, and the radiating element is directly connected to the feed point on the PCB, thereby broadening bandwidth while reducing device complexity and component count.
3Reliability
If a monopole antenna or PIFA is placed at the edge of a PCB with a passive parasitic unit, then the bandwidth is broadened to cover multiple frequency bands, but the antenna size increases
Solution Approach 1:
The patent nests the radiating element within the PCB structure itself, utilizing the PCB's thickness and layers to contain the antenna components. The ground plane is integrated into the PCB's ground layer, and the radiating element is positioned vertically within the available space, thereby achieving broadened bandwidth without increasing the overall antenna size or device footprint.
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
The solution achieves a high gain and improved un-roundness of the horizontal pattern, enabling coverage of multiple frequency bands including GPS and Bluetooth without additional antennas, thus enhancing user experience and reducing costs.
Implementation Method 1
forming a dipole antenna with a mirror effect
Implementation Method 2
In a manner of coupling resonance of the grounded metal sheet or the FPC, the bandwidth is broadened
Data Source
Figure 1~2
Figure 3
AI summary
The present invention discloses a mobile communication antenna device. The device includes: a monopole antenna, placed on one side of a printed circuit board, where a distance between the monopole antenna and a central position of the printed circuit board is less than a threshold, and the monopole antenna includes a first metal sheet which is vertical to the printed circuit board, and is conducted with a circuit of the printed circuit board through a feedpoint. The present invention also discloses a mobile communication terminal device. By adopting the present invention, an ultra wideband antenna may be achieved, thereby making it possible that a mobile communication terminal device product, such as a fixed station, supports more frequency bands.