Reflecting Cavity Antenna Pillar Impedance Bandwidth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
5G mobile terminals face challenges in coexisting with 2G/3G/4G/GPS/WIFI/BT antennas due to the narrow antenna size and complex metal environment, requiring an antenna solution that minimizes interference and radiation while supporting beam forming at millimeter wave frequencies.
Innovation Solution
A wide band antenna element with a reflecting cavity, comprising a metal frame, feeder line, feed screw, pillar, and insulating sleeve, which reduces radiation and impedance differences, and is integrated with a U-shaped metal frame to minimize backward radiation and enhance impedance bandwidth, allowing coexistence with other antennas without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a feed screw is used to feed the reflecting cavity, then the structure is simple and easy to manufacture, but the bandwidth of the antenna becomes narrow due to big impedance difference
Solution Approach 1:
The patent introduces a pillar as an intermediary component between the feed screw and the reflecting cavity. This pillar acts as a transition structure that bridges the impedance mismatch between the feed screw and the cavity, enabling gradual impedance transformation while maintaining the simple feed screw structure. The pillar's specific geometry and positioning allow it to mediate the electromagnetic field distribution, thereby expanding the antenna bandwidth without complicating the feeding mechanism.
Solution Approach 2:
The patent modifies the geometric parameters of the pillar structure, including its dimensions, position, and shape characteristics, to optimize the impedance transformation. By carefully adjusting these parameters, the design achieves gradual impedance matching between the feed screw and the reflecting cavity, thereby expanding the operational bandwidth while keeping the overall structure simple and manufacturable.
2Device complexity
If the 5G antenna is integrated with 2G/3G/4G/GPS/WIFI/BT antennas on the metal frame, then the device complexity is reduced, but the radiation interference between antennas increases
Solution Approach 1:
The patent divides the metal frame into multiple segmented regions, each designated for specific antenna types. The reflecting cavity structure is used to create electromagnetic isolation zones that segment the radiation patterns of different antennas. This segmentation allows multiple antenna systems to coexist on the same metal frame while minimizing mutual interference through spatial and electromagnetic field separation.
Solution Approach 2:
The patent utilizes the metal frame, which could potentially cause interference, by incorporating reflecting cavities that convert the harmful backward radiation into beneficial forward-directed radiation. The cavities reflect electromagnetic energy in controlled directions, transforming what would be interference into useful radiation patterns that enhance antenna performance while reducing harmful emissions.
3Object-affected harmful factors
If the reflecting cavity is designed to reduce backward radiation, then the radiation safety is improved, but the antenna size increases
Solution Approach 1:
The patent implements a nested structure where the pillar is positioned within the reflecting cavity, and the feed screw is integrated with the pillar assembly. This nesting arrangement allows the radiation-control components to be compactly organized within the minimal necessary volume. The cavity dimensions are optimized to be the smallest possible while still achieving effective backward radiation reduction, thereby minimizing the overall antenna size while maintaining radiation safety.
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 enables high-gain, wide-bandwidth, and wide-beam scanning angle for 5G antennas, ensuring stable performance and interference immunity with existing antennas, suitable for the complex electromagnetic environment of metal case mobile terminals.
Implementation Method 1
The reflecting cavity can change a radiation direction of the 5G antenna, so that the electromagnetic radiation that human suffers can be reduced
Implementation Method 2
The pillar in the reflecting cavity forms a gradual transition structure between the feed screw and the first wall of the cavity, which can properly improve the impedance bandwidth of the antenna element
Data Source
AI summary
The disclosure relates generally to a broadband antenna element with a reflecting cavity, which includes a metal frame, a feeder line, a feed screw, a pillar and an insulating sleeve. The reflecting cavity is formed by the inner concave of the outer side of the metal frame. The reflecting cavity includes the first wall and the second wall distributed from bottom to top. The first wall, the pillar, the second wall and the feeder line are arranged orderly and are connected with the feed screw. The pillar and the feed screw are connected by screw thread. The feed screw is connected with the second wall through an insulating sleeve. The pillar is a good conductor and under surface of the pillar contacts with the first wall, and the under surface area of the pillar is larger than the upper surface area of the pillar.