Slotted Shorting Wall Antenna for Broadside Radiation
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Solution Overview
Problem
Dual-broadband antennas face challenges in achieving a broadside radiation pattern suitable for wall-mounted deployments, as traditional U-Slot antennas with shorting walls or pins result in elevation plane patterns similar to monopoles, which are not desirable for such applications.
Innovation Solution
A dual-broadband antenna design incorporating a quarter wave (QW) patch element with a U-Slot and a slotted shorting wall, where the outer stubs force high-current points at the corners for the QW mode at 2.4 GHz and the inner stub provides wide-band impedance matching at 5 GHz, ensuring a broadside pattern by folding a single piece of conductive material to create both radiation portions and a ground plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a U-Slot antenna is equipped with a shorting wall or shorting pin, then the antenna can operate at broadband frequencies, but it produces two near end-fire lobes resulting in an elevation plane pattern similar to a monopole, which is not desirable for wall-mounted deployments
Solution Approach 1:
The shorting wall is segmented by introducing slots that divide it into multiple conductive portions. This segmentation transforms the current distribution along the shorting wall, forcing high-current points at the corners of the QW patch element and creating a single broadside lobe pattern suitable for wall-mounted deployments while maintaining broadband operation
Solution Approach 2:
Different portions of the slotted shorting wall serve different functions: the outer stubs force high-current points at the corners for QW mode operation, while the inner stub provides wide-band impedance matching. This local differentiation of functionality resolves the pattern issue while preserving broadband capability
2Shape
If a quarter wave patch mode antenna is used, then a wide-beam broadside pattern is achieved, but it requires external ground planes or reflectors which increases device complexity and profile
Solution Approach 1:
The slotted shorting wall integrates the functions of both the shorting structure and the ground plane into a single component. The conductive portions of the slotted shorting wall serve as the ground reference while also shaping the radiation pattern, eliminating the need for separate external ground planes or reflectors
Solution Approach 2:
The slotted shorting wall performs multiple functions simultaneously: it provides the shorting connection, establishes the ground reference plane, shapes the radiation pattern to produce a broadside beam, and enables broadband operation. This multi-functionality reduces overall device complexity while maintaining the desired radiation characteristics
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 design achieves a low-cost, low-profile dual-broadband antenna with a broadside radiation pattern independent of external ground planes or reflectors, suitable for wall-mounted deployments, effectively covering both 2.4 GHz and 5 GHz frequencies with minimal distortion.
Implementation Method 1
Through the feed line the electric current excites the QW patch element. The electric current exciting the QW patch element results in the broadcasting of low band and wide band frequencies.
Implementation Method 2
The method impedes the electric current from both the low band and the wide band by slots in a shorting wall connecting the QW patch element with the ground plane.
Data Source
AI summary
In one embodiment, an apparatus is formed using a quarter wave (QW) patch element with a U-Slot, a ground plane, and a slotted shorting wall. A feed line runs through the ground plane and connects to the QW patch element. The slotted shorting wall connects the QW patch element to the ground plane. The QW patch element, slotted shorting wall, and ground plane are composed of a single contiguous folded material.