Circuit-Integrated Patch Antenna With Ring Capacitive Matching
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Solution Overview
Problem
Conventional antenna structures integrated with circuits have poor directivity and radiation efficiency, leading to shortened wireless transmission distances and limited bandwidth, making it difficult to achieve high-power, low-loss signal transmission with a favorable signal-to-noise ratio.
Innovation Solution
The proposed antenna integrated with a circuit features a patch conductor, a feed line, two parallel slits, and a ring conductor arranged with a gap to form an electric capacitance, allowing for impedance matching and adjustment of central frequency, bandwidth, directivity, and gain through design parameter optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional patch antenna structure is used, then the antenna can be easily mounted on the MMIC substrate, but the directivity and radiation efficiency are poor, resulting in shortened wireless transmission distance
Solution Approach 1:
The antenna structure is segmented into multiple functional components: a patch conductor for radiation, a feed line for signal input, two parallel slits for impedance control, and a ring conductor with gap for capacitance adjustment. This segmentation allows each component to be optimized independently while maintaining ease of integration on the MMIC substrate.
Solution Approach 2:
The ring conductor with gap acts as an intermediary element between the patch conductor and the ground plane, providing adjustable capacitance that mediates the impedance matching and field distribution, thereby improving directivity and radiation efficiency without complicating the mounting process.
2Device complexity
If a single frequency resonance system is used, then the antenna structure is simple, but the bandwidth is limited and cannot be widened easily
Solution Approach 1:
The antenna structure incorporates adjustable parameters (slit dimensions, ring conductor gap size, ring conductor dimensions) that allow dynamic optimization of the resonance characteristics. By adjusting these parameters, the bandwidth can be widened while maintaining a relatively simple overall structure that is easy to fabricate on MMIC substrates.
Solution Approach 2:
The invention utilizes parameter changes in the geometric dimensions of the slits and ring conductor to control the capacitance and inductance, thereby adjusting the resonance frequency and bandwidth. This allows bandwidth optimization without fundamentally changing the simple patch antenna structure.
3Area of stationary object
If the field distribution spreads out in the conventional structure, then the antenna covers a wider area, but the directivity deteriorates and gain is reduced
Solution Approach 1:
The ring conductor with gap introduces localized capacitance effects at specific positions around the patch conductor. This creates non-uniform field distribution that concentrates the electromagnetic energy in specific directions, thereby improving directivity and gain while controlling the overall field distribution area.
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 significantly improves directivity and gain, stabilizes field distribution, and achieves broadband radiation properties, enabling longer wireless transmission distances and increased information capacity in millimeter wave/terahertz bands.
Implementation Method 1
an electric capacitance can be formed between the patch conductor and the ring conductor, that is, at a gap
Implementation Method 2
a patch conductor that is formed on a surface of the substrate, and radiates an electromagnetic field having been fed
Data Source
AI summary
Arranged on a surface of a substrate are a patch conductor that radiates an electromagnetic field having been fed, a feed line that feeds the patch conductor with the electromagnetic field having been input, two slits parallel to the feed line on both sides of a connection part of the feed line toward an inner side of the patch conductor, and a ring conductor at a space from the patch conductor with an interposition of a gap to surround an outer periphery of the patch conductor. Accordingly, an electric capacitance can be formed between the patch conductor and the ring conductor, and when achieving impedance matching with the feed line, adjustment can be performed using the size of the ring conductor and the gap.