Slot Array Antenna With Ridge Waveguide For Millimeter Wave
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-frequency slot array antennas face efficiency losses due to dielectric loss in microstrip lines, necessitating alternative waveguide structures that can effectively guide electromagnetic waves with low loss at frequencies above 30 GHz.
Innovation Solution
A slot array antenna design incorporating a ridge-shaped waveguide with artificial magnetic conductors, featuring a waffle-iron structure and electrically conductive rods, which restricts electromagnetic wave propagation within a specific frequency band, allowing for low-loss antenna feeding and high-density element placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a microstrip line is used to feed the array antenna, then the antenna structure is simple and easy to manufacture, but dielectric loss increases significantly at frequencies above 30 GHz, reducing antenna efficiency
Solution Approach 1:
The patent changes the feeding structure from microstrip line to hollow waveguide, fundamentally altering the transmission medium parameters. This substitution eliminates the dielectric material that causes loss at high frequencies, while maintaining a relatively simple waveguide structure that is easy to manufacture and assemble.
Solution Approach 2:
The patent employs a composite structure combining hollow waveguide with slot array elements. The waveguide provides low-loss transmission at millimeter wave frequencies, while the slot arrays provide efficient radiation. This composite approach solves both the low-loss transmission requirement and the radiation efficiency requirement simultaneously.
2Loss of energy
If a hollow waveguide with slots is used, then dielectric loss is reduced at high frequencies, but the structure becomes more complex compared to microstrip line feeding
Solution Approach 1:
The patent divides the waveguide structure into discrete segments with slots at specific intervals. Each slot acts as an independent radiating element, and the waveguide is segmented into sections that can be separately manufactured and then assembled. This segmentation reduces the complexity of manufacturing the entire structure as one piece while maintaining the low-loss transmission path.
3Quantity of substance
If slots are placed closer than half-wavelength intervals, then element density increases and antenna size is reduced, but phase consistency among slots becomes difficult to maintain
Solution Approach 1:
The patent transitions from conventional microstrip line feeding (two-dimensional planar structure) to hollow waveguide feeding (three-dimensional volumetric structure). This dimensional change allows slots to be positioned at optimized intervals along the waveguide while maintaining proper phase relationships through the waveguide's internal electromagnetic field distribution, achieving both high element density and phase consistency.
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 achieves good radiation characteristics with reduced dielectric loss, enabling efficient transmission and reception of high-frequency electromagnetic waves, particularly in the millimeter wave band, while maintaining a simple construction.
Implementation Method 1
a waveguide member (122) having a waveguide face (122a) which extends along a first direction and which is opposed to the second electrically conductive surface
Implementation Method 2
structures which guide electromagnetic waves by utilizing an artificial magnetic conductor (AMC) extending on both sides of a ridge-type waveguide
Implementation Method 3
These slot array antennas include a plurality of rectangular slots as antenna elements, the rectangular slots being arrayed along the waveguide
Data Source
AI summary
A slot array antenna includes: first and second conductive members; and a ridge-shaped waveguide member on the second conductive member and conductive rods surrounding it. The waveguide member has a waveguide face which is opposed to a conductive surface of the first conductive member and which extends along a first direction. The first conductive member includes first and second slot groups each arranged along the first direction. The second conductive member has a throughhole which splits the waveguide member into first and second ridges. Some slots in the first and second slot groups are connected to a waveguide within the throughhole via a waveguide extending between the waveguide face of the first ridge and the conductive surface, and the remaining slots are connected to the waveguide within the throughhole via a waveguide extending between the waveguide face of the second ridge and the conductive surface.