Slotted Waveguide Antenna Control Walls Reduce Reflection
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Solution Overview
Problem
Conventional slotted waveguide tube array antennas have high production costs and poor transmission quality due to the difficulty in tightly adhering the base and slot plates, and they require improvement in reducing reflection coefficients and increasing gain in specific frequency ranges.
Innovation Solution
A slotted waveguide array antenna with a rectangular parallelepiped shape featuring slots on the upper wall and control walls inside the waveguide that are perpendicular to the upper and side walls, with the slots bridging interfaces between regions partitioned by the control walls and not overlapping them, allowing for improved reflection cancellation and gain enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a base and slot plate are individually prepared and bonded together, then the antenna can be assembled, but the production cost becomes high and transmission quality deteriorates due to poor adhesion
Solution Approach 1:
The invention merges the base and slot plate into a single integrated waveguide structure. The waveguide has a rectangular parallelepiped shape with slots directly formed in its upper wall, eliminating the need for separate base and slot plate components. This integration removes bonding processes, reduces production cost, and ensures reliable transmission quality without adhesion issues.
Solution Approach 2:
The invention introduces control walls inside the waveguide that partition the internal space into multiple regions. These control walls are positioned to create distinct zones that help manage wave propagation and reduce reflection. The segmentation is achieved through precise positioning of control walls without overlapping the slots when viewed from above.
2Reliability
If a wall plate is provided inside the waveguide to cancel reflected waves, then reflection characteristics improve, but the layout becomes complex and production cost increases
Solution Approach 1:
The control walls are merged with the waveguide structure itself, forming an integrated design where the control walls are internal partitions within the waveguide body. This eliminates the need for separate wall plate components that would require additional bonding and complex layout, while still achieving reflection cancellation through the partitioned regions.
3Ease of operation
If multiple components are bonded together to form the antenna, then assembly is possible, but adhesion reliability becomes poor and transmission quality deteriorates
Solution Approach 1:
The waveguide is designed as a single integrated component with slots and control walls formed as part of its structure. This eliminates the need for bonding multiple components together, thereby ensuring high adhesion reliability and maintaining transmission quality without the risks associated with bonded joints.
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 reduces reflection coefficients and increases gain in desired frequency ranges while reducing production costs and improving transmission quality by using a laminated structure with control walls that effectively cancel out reflected waves and can be produced using a printed circuit board technique.
Implementation Method 1
it is important to reduce reflection occurring at each slot, because reflection occurring at each slot deteriorates reflection characteristics and causes gain reduction
Implementation Method 2
a wave reflected at each slot is canceled out by a wave reflected at the wall plate
Data Source
AI summary
A slotted waveguide array antenna having a smaller reflection coefficient and a larger gain than conventional one is realized. In a slotted waveguide array antenna (1A), control walls (12c1-12c6) orthogonal to an upper wall (11) and side walls of the waveguide are provided inside the waveguide, and slots (11d1-11d6) each extend over an interface between regions formed by partition with corresponding one of the control walls but do not overlap the corresponding one of the plurality of control walls when viewed from above.