Waveguide Slot Antenna Feed Layout for Compact High-Frequency Design
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Solution Overview
Problem
Conventional waveguide slot antennas face challenges in reducing size while maintaining characteristics due to the periodicity of standing waves, which limits the proximity of the power feeding part to the short-circuit wall, causing mutual interference and increased capacitance, leading to longer antenna lengths.
Innovation Solution
A waveguide slot antenna configuration where the power feeding part penetrates the dielectric substrate and overlaps a slot, reducing size by integrating the power feeding part and slot as a single antenna, and optimizing the position of the short-circuit wall to align with the electric field zero point, thereby minimizing capacitance and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the power feeding part is positioned closer to reduce antenna size, then the antenna length is reduced, but mutual interference occurs between the power feeding part and the slot
Solution Approach 1:
The power feeding part is positioned in the width direction (Y-axis) rather than the length direction (X-axis), allowing it to overlap the slot in plan view without causing mutual interference. This dimensional repositioning enables size reduction while maintaining antenna characteristics.
Solution Approach 2:
The power feeding part is positioned at a specific location where it overlaps the slot in plan view but maintains appropriate spacing in the width direction. This localized positioning optimizes the balance between size reduction and interference prevention.
2Length of moving object
If the power feeding part is positioned closer to the short-circuit wall, then the antenna length is reduced, but the arrangement is limited by standing wave periodicity
Solution Approach 1:
The power feeding part is repositioned in the width direction (Y-axis) rather than being constrained along the length direction (X-axis) by standing wave periodicity. This allows greater flexibility in positioning and reduces antenna length without being limited by standing wave constraints.
3Length of moving object
If the power feeding part overlaps the slot, then size reduction is achieved, but capacitance may be generated between the power feeding part and conductive layer
Solution Approach 1:
The power feeding part is positioned at a specific location where it overlaps the slot in plan view but maintains appropriate spacing in the width direction. This localized positioning allows size reduction while minimizing capacitance generation between the power feeding part and the conductive layer.
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 configuration achieves significant size reduction while maintaining antenna characteristics by reducing mutual interference and capacitance, allowing for improved high-frequency performance.
Implementation Method 1
high-frequency signals fed from a power feeding part are propagated (or transmitted) to the waveguide and radiated (emitted) as electromagnetic waves
Implementation Method 2
high-frequency signals fed from a power feeding part are propagated (or transmitted) to the waveguide and radiated (emitted) as electromagnetic waves from the plurality of slots
Implementation Method 3
it is difficult to bring the power feeding part closer to the short-circuit wall part due to a periodicity of a standing wave in the waveguide
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3~4
AI summary
The present invention provides a waveguide slot antenna which is configured based on a structure and an arrangement of a power feeding part and which is suitable for size reduction while maintaining characteristics. The waveguide slot antenna is configured by a waveguide, formed by a dielectric substrate (10), a first conductive layer (11) formed at a lower surface of the dielectric substrate (10), a second conductive layer (12) formed at an upper surface of the dielectric substrate (10) and provided with one or a plurality of slots (14) and a pair of side wall parts (W1, W2) electrically connecting the first and second conductive layers and extending in a first direction (X), being provided with a power feeding part (15). The one or the plurality of slots includes a first slot (14a) having a predetermined slot length (L) along the first direction. The waveguide slot antenna has a structure in which, on a plan view from a second direction (Z), the power feeding part is arranged at a position where the power feeding part overlaps the first slot, and the power feeding part does not deviate from a range of the slot length along the first direction.