Helical Wire Zeroth-Order Resonance Waveguide Antenna
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Solution Overview
Problem
Existing waveguides and antennas face challenges in achieving uniform electric and magnetic field distribution, leading to uneven power density and larger antenna sizes, which affect microwave oven heat distribution and radar detector directivity.
Innovation Solution
A rectangular waveguide with a conductive helical wire inserted into the cavity, where the wire is short-circuited at both ends and arranged to create a zeroth-order resonance, allowing for uniform field distribution and reducing antenna size by eliminating half-wavelength slot array restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional waveguide is used with basic or higher-order modes, then the waveguide can transmit high frequency signals with low loss and high power handling, but the electric field and magnetic field distribution varies periodically like standing wave, causing non-uniform power density distribution
Solution Approach 1:
The patent changes the operating mode parameter from conventional TE10 or higher-order modes to zeroth-order resonance mode. This parameter change fundamentally alters the field distribution characteristics, transforming the periodic standing wave pattern into a uniform field distribution throughout the waveguide cavity, thereby resolving the contradiction between power handling and field uniformity
Solution Approach 2:
The patent utilizes resonance phenomenon at the zeroth-order mode to create uniform field distribution. By operating at this specific resonant frequency, the electromagnetic fields establish a stable uniform pattern throughout the cavity, eliminating the periodic variations inherent in conventional modes while maintaining high power handling capability
2Reliability
If multiple slots separated by half-wavelength intervals are formed in existing leaky-wave antennas, then good directivity radiation can be achieved, but the antenna size becomes larger and experiences more insertion loss
Solution Approach 1:
The patent extracts and eliminates the requirement for multiple slots separated by half-wavelength intervals from the conventional leaky-wave antenna design. By using zeroth-order resonance mode, the antenna achieves good directivity radiation with a single slot or reduced number of slots, thereby reducing the overall antenna size and minimizing insertion loss while maintaining radiation performance
Solution Approach 2:
The patent inverts the conventional approach by not relying on periodic slot arrangements for directivity. Instead, it uses the zeroth-order resonance mode which inherently provides uniform field distribution and effective radiation, thereby achieving good directivity with a compact structure that eliminates the need for large periodic slot arrays
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 solution enables uniform electric and magnetic field distribution throughout the waveguide, enhancing microwave oven heat distribution and achieving high directivity radiation with a smaller antenna size, similar to existing leaky-wave antennas.
Implementation Method 1
the target zeroth-order resonance frequency of the waveguide will change the evanescent mode below the cut-off frequency of the waveguide to metamaterial left-handed region propagation mode or resonance mode
Implementation Method 2
the target zeroth-order resonance frequency of the waveguide will change the evanescent mode below the cut-off frequency of the waveguide to metamaterial left-handed region propagation mode
Implementation Method 3
the conductive helical wire inserted into the cavity of the waveguide, wherein the main body of the conductive helical wire does not contact the inner surfaces of the waveguide at a predetermined gap, and both ends of the conductive helical wire are short-circuited to the inner surface of the waveguide
Data Source
AI summary
An apparatus to create uniform electric and magnetic-field distribution as zeroth-order resonance in a waveguide and a cavity according to an embodiment of the present invention includes a rectangular waveguide with a rectangular-shaped cross section comprising a cavity in the inside, and a conductive helical wire inserted into the cavity of the waveguide, wherein the main body of the conductive helical wire does not contact the inner surfaces of the waveguide at a predetermined gap, and both ends of the conductive helical wire are short-circuited to the inner surface of the waveguide, so as to create a uniform electric field and magnetic field throughout the entire waveguide.