Slotted Patch Antenna Layout for Transmission Band Alignment
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Solution Overview
Problem
Conventional slotted patch antennas have a mismatch in the transmission/reception bands between the patch antenna operation and the slot antenna operation due to the limited effect of the dielectric substrate's permittivity on the electrical length of the slots, making it difficult to align the bands.
Innovation Solution
The slotted patch antenna incorporates a radiation electrode with meandering, curved, or folded slots to increase the electrical length of the slots, allowing for greater flexibility in setting the transmission/reception bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If straight slots are used in the radiation electrode, then the slot antenna operation band is determined by the slot length, but the transmission/reception band of the slot antenna operation cannot be aligned close to the patch antenna operation band due to limited effect of dielectric substrate permittivity on slot electrical length
Solution Approach 1:
The patent applies curvature by replacing straight slots with meandering slots that have curved portions. The meandering shape increases the electrical length of the slots without increasing the physical footprint, allowing the slot antenna operation band to be aligned closer to the patch antenna operation band. The curved portions of the meandering slots effectively increase the electrical length while maintaining compact dimensions.
Solution Approach 2:
The patent segments the slot structure into multiple sections with different orientations and curvatures. The meandering slots are divided into multiple linear sections connected at angles, creating a segmented path that increases electrical length. This segmentation allows independent optimization of each section to achieve the desired band alignment while maintaining manufacturing feasibility.
2Shape
If the overall length of straight slots is kept shorter than the side length of the radiation electrode, then the antenna maintains a compact square shape, but the transmission/reception band of the slot antenna operation becomes higher than the patch antenna operation band
Solution Approach 1:
The meandering slots incorporate curved portions that increase the electrical length within the compact square boundary. The curvature allows the slot path to meander through the available space, effectively increasing electrical length without exceeding the physical dimensions of the radiation electrode, thus maintaining the compact square shape while achieving band alignment.
Solution Approach 2:
The patent utilizes the two-dimensional plane of the radiation electrode more efficiently by creating meandering paths that exploit both horizontal and vertical dimensions. Instead of extending slots in a single direction, the meandering design distributes the slot path across multiple directions within the square boundary, increasing electrical length while maintaining the compact form factor.
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 design enables the alignment of the transmission/reception bands, allowing the antenna to operate effectively in required frequency bands such as the 1.2 GHz and 1.5 GHz bands, while maintaining efficient circular polarization.
Implementation Method 1
the effect of increasing the electrical length of the radiation electrode 20 due to the permittivity of the dielectric substrate 10
Implementation Method 2
the effect of increasing the electrical length of the radiation electrode 20 due to the permittivity of the dielectric substrate 10
Implementation Method 3
feeding signals that are different from each other in phase by 90° to two feeding points so that circularly polarized waves can be transmitted and received efficiently
Data Source
AI summary
A slotted patch antenna includes a dielectric substrate, a radiation electrode which is provided on a major surface of the dielectric substrate, and a ground conductor which is disposed on a surface that is opposite to the major surface. The radiation electrode is formed with a slots having at least one of a meandering portion, a curve portion, or a folded portion. An external shape of the radiation electrode is a square, and totally two pairs of slots are formed inside the square, each of the slots being along respective sides of the square. Each of the slots is arranged so as to be line-symmetrical with respect to an axis of symmetry that is parallel with one of the sides of the square and passes through a center of the square, and to be point-symmetrical with respect to the center of the square.