Multi-Band Antenna Layout for Low-Frequency Response and HF Bandwidth
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Solution Overview
Problem
Current planar inverted-F antennas (PIFA) face challenges in enhancing the frequency response of the low-frequency segment and bandwidth of the high-frequency segment, while also being compact and lightweight to accommodate the internal space requirements of electronic devices.
Innovation Solution
The antenna design involves a ceramic rectangular carrier with blind holes and ribs, which adjusts the effective dielectric constant to enhance resonant frequency and bandwidth. The high-frequency and low-frequency segments are strategically positioned to minimize shielding and maximize free space, respectively, thereby improving frequency response and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the low-frequency radiator is positioned on the left side of the carrier corresponding to a larger area of the ground metal plane, then the ground shielding effect is stronger, but the frequency response of the low-frequency segment deteriorates
Solution Approach 1:
The patent inverts the conventional antenna layout by positioning the low-frequency radiator on the right side of the carrier corresponding to a smaller area of the ground metal plane, rather than the larger area side. This inversion reduces ground shielding effects and improves frequency response while maintaining compact dimensions.
2Object-affected harmful factors
If the high-frequency radiator is positioned on the right side of the carrier corresponding to a smaller area of the ground metal plane, then the ground shielding effect is reduced, but the bandwidth of the high-frequency segment is insufficient
Solution Approach 1:
The patent inverts the conventional high-frequency radiator positioning by placing it on the left side of the carrier corresponding to a larger area of the ground metal plane. This inversion increases ground shielding effects that can be utilized to extend bandwidth while maintaining acceptable ground shielding levels.
3Reliability
If the antenna is formed on PCB or by pressing metal membrane into radiation body, then the signal transmission quality is ensured, but the volume required increases impacting light weight and compact requirements
Solution Approach 1:
The patent merges the antenna radiators directly onto the surface of the ceramic carrier, integrating the radiation function with the carrier structure. This eliminates the need for separate PCB or metal membrane structures, reducing overall volume while maintaining signal transmission quality.
Solution Approach 2:
The ceramic carrier serves multiple functions: it provides mechanical support, acts as the antenna radiation body, and enables multi-frequency band operation. This multi-functionality reduces the need for separate components, achieving compact dimensions without compromising performance.
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 design achieves better frequency response for the low-frequency segment and higher bandwidth for the high-frequency segment, effectively addressing the limitations of existing PIFA designs while maintaining a compact and lightweight form factor.
Implementation Method 1
The area ratio of the blind holes and the volume ratio of the blind holes can be used to adjust the effective dielectric constant of the carrier, thus adjusting resonant frequency and the bandwidth
Implementation Method 2
adjusting resonant frequency and the bandwidth
Data Source
AI summary
A ten-frequency band antenna includes a carrier, a high-frequency segment, a low-frequency segment, a printed circuit board (PCB) and an inductor. The high-frequency segment is arranged on left side of the carrier and the low-frequency segment is arranged on right side of the carrier. The radiator on the bottom face of the carrier electrically connects with the micro strip of the PCB and the ground line of the ground metal when the carrier is fixed to the PCB. The low-frequency segment is located at an opened area and corresponding to a metal face with smaller area such that the low-frequency segment is at a free space to enhance the frequency response of the low-frequency segment and the bandwidth of the high-frequency segment. The area and the volume of blind hole on the carrier can adjust the effective dielectric constant to adjust the resonant frequency and bandwidth of the antenna.