Patch Antenna Element with Asymmetric Feed Points for Multi-Band Radiation

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Solution Overview

Problem

Microstrip antennas face challenges in achieving compactness while supporting multiple frequency bands with good directivity and high cross-polarization discrimination, due to the complexity of wiring required for feeding radio-frequency signals with different phases across various frequency bands.

Innovation Solution

The design incorporates a compact antenna element with a ground conductor and two feeding conductors of different sizes, where radio-frequency signals are transmitted through a single feed line to feed points on each conductor, with some points receiving direct feeding and others capacitive feeding, allowing for antiphase signal transmission across multiple frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple feed lines are used to support multiple frequency bands with different phase signals, then the antenna can radiate radio waves in multiple communication bands with good directivity, but the wiring becomes complex and the antenna size increases

Engineering Contradiction:

Improvemulti-band radiation capabilityVSAvoidwiring complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple feed lines into a single feed line that serves multiple feeding conductors. The single feed line transmits radio-frequency signals to both the first feeding conductor (for first frequency band) and the second feeding conductor (for second frequency band), thereby reducing wiring complexity while maintaining multi-band radiation capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single feed line performs multiple functions by feeding different frequency bands to different feeding conductors. It simultaneously provides signals for the first frequency band to the first feeding conductor and for the second frequency band to the second feeding conductor, making the feed line universal for multiple frequency bands.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

Engineering Contradiction:

Improvemulti-band radiation capabilityVSAvoidantenna size

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent merges multiple feed lines into one single feed line structure, reducing the overall space required for wiring. This consolidation directly reduces the antenna's footprint while maintaining the capability to support multiple frequency bands through the unified feed line.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If symmetric feed points are used for both feeding conductors, then the wiring structure is simplified, but the antenna cannot achieve good directivity and high cross-polarization discrimination for multiple frequency bands

Engineering Contradiction:

Improvewiring structure simplicityVSAvoiddirectivity and cross-polarization discrimination

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent employs asymmetric feed point arrangements where the first feeding conductor has feed points at different positions (first feed point and second feed point) and the second feeding conductor has feed points at different positions (third feed point and fourth feed point). This asymmetric configuration enables the antenna to achieve good directivity and high cross-polarization discrimination for multiple frequency bands while the feed line connects to these asymmetrically positioned feed points.

Inventive Principle:

Principle #4Asymmetry

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 enables efficient radiation of radio waves across multiple frequency bands with improved directivity and cross-polarization discrimination, reducing the size and complexity of the antenna while maintaining high performance.

Implementation Method 1

The second feeding conductor has a third feed point for direct feeding through the first feed line and a fourth feed point for capacitive feeding through the first feed line

Methodology Applied

Scientific EffectCapacitive feeding: Capacitance

Data Source

PatentUS10892554B2Antenna element, antenna module, and communication device

Publication Date: 2021.01.12 MURATA MFG CO LTD

AI summary

A patch antenna includes a ground conductor pattern, feeding conductor patterns (11, 12), and a feed line (15). The feeding conductor patterns (11, 12) are disposed on the same side with respect to the ground conductor pattern and are of different sizes. The feeding conductor pattern (11) has feed points (111, 112) for direct feeding through the feed line. The feeding conductor pattern (12) has a feed point (121) for direct feeding through the feed line and a feed point (122) for capacitive feeding through the feed line. The feed points (111, 112) are opposite to each other with respect to a center point of the feeding conductor pattern (11). The feed points (121, 122) are opposite to each other with respect to a center point of the feeding conductor pattern (12).