Wide Beam Waveguide Antenna Protrusions
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Solution Overview
Problem
Conventional widebeam RF antennas are often bulky, complex, expensive, and difficult to fabricate or maintain, especially when handling broad band RF signals and circularly polarized electromagnetic radiation, while also exhibiting excessive return loss and high cross polarization.
Innovation Solution
A widebeam RF antenna design featuring a waveguide with electrically conductive protrusions that extend internal electromagnetic currents and fields towards the proximal end, allowing for quasi-omnidirectional coverage patterns without the use of dielectric components, and optionally incorporating ridges for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional techniques are used to design widebeam antennas, then the antenna can provide quasi-omnidirectional coverage, but the antenna becomes bulky, complex, expensive, and difficult to fabricate and maintain
Solution Approach 1:
The antenna is segmented into a waveguide section and a tapered notch section, with the notch extending upwards from the waveguide aperture. This segmentation allows the antenna to achieve widebeam coverage while maintaining a simpler overall structure compared to conventional widebeam designs.
Solution Approach 2:
The antenna design extends the radiation pattern into the vertical dimension through the upward-extending tapered notch, achieving quasi-omnidirectional coverage (elevation angles of 45 degrees or more from boresight) without requiring a complex array structure in the horizontal plane.
2Adaptability or versatility
If conventional techniques are used to design widebeam antennas, then the antenna can provide widebeam coverage, but the antenna exhibits excessive return loss, particularly when handling broad band RF signals
Solution Approach 1:
The antenna design changes the geometric parameters of the radiation structure by introducing a tapered notch that extends upward from the waveguide aperture. The tapering geometry (gradually adjusting electromagnetic field towards free space conditions) optimizes impedance matching across broad bandwidth, reducing return loss while maintaining widebeam coverage.
3Adaptability or versatility
If conventional techniques are used to design widebeam antennas, then the antenna can achieve widebeam coverage, but the antenna exhibits high cross polarization over almost all directions
Solution Approach 1:
The antenna design applies local quality modification by introducing electrically conductive protrusions or ridges at specific locations on the waveguide exterior surface. These localized features are positioned and dimensioned to control the electromagnetic field distribution, reducing cross-polarization components in specific directions while maintaining widebeam coverage.
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 compact, simple, and cost-effective widebeam RF antenna with low cross polarization over a wide range of angles, effectively radiating RF energy at angles away from the boresight with minimal return loss, suitable for applications requiring broad band signal handling and circular polarization.
Implementation Method 1
The protrusions are configured to at least partially extend internal electromagnetic currents and internal electromagnetic fields of the RF antenna in a direction toward the proximal end of the waveguide
Implementation Method 2
the waveguide configured for one or both of radiating RF energy and receiving RF energy
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
A wide beam radio frequency (RF) antenna includes a waveguide and one or more electrically conductive protrusions. The waveguide has at least one electrically conductive interior wall surface, a boresight defined by a longitudinal axis, and an aperture plane, transverse to the longitudinal axis, disposed at a distal end of the waveguide. A first proximal portion of each protrusion is electrically coupled to the electrically conductive interior wall surface, a distal portion of the protrusion being outside the aperture plane.