Dual Band Circular Patch Antenna with Cylindrical Matching Element

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Solution Overview

Problem

Traditional WiFi access points often require multiple antennas for different frequency bands, leading to increased complexity and size, while maintaining band-to-band isolation, which complicates achieving efficient omnidirectional coverage.

Innovation Solution

A dual band antenna design featuring a circular patch antenna coupled with a cylindrical matching element and shorting pins, formed from a single piece of metal, to provide impedance for both 2.4 GHz and 5 GHz bands, allowing for compact and efficient operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate antennas are used for each frequency band, then band-to-band isolation is maintained, but device complexity and size increase

Engineering Contradiction:

Improveband-to-band isolationVSAvoidnumber of antennas

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple frequency band operations into a single antenna structure. The circular patch antenna with cylindrical matching element is designed to operate across both 2.4 GHz and 5 GHz bands simultaneously, eliminating the need for separate antennas for each band while maintaining proper band-to-band isolation through the duplexer

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If multiple antennas are used for MIMO operation, then wireless performance is improved, but physical size and complexity increase

Engineering Contradiction:

Improvewireless performanceVSAvoidantenna system size

Core Design Contradiction:

ProductivityVSVolume of stationary object

Solution Approach 1:

The single circular patch antenna is designed to perform multiple functions: it supports both 2.4 GHz and 5 GHz frequency bands, provides omnidirectional coverage, and enables MIMO operation through its ability to handle multiple RF paths. This multi-functional design achieves improved wireless performance without requiring multiple separate antenna elements

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If dual band operation is implemented with traditional designs, then frequency versatility is achieved, but omnidirectional coverage efficiency is compromised

Engineering Contradiction:

Improvefrequency band coverageVSAvoidomnidirectional coverage efficiency

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent employs a circular patch geometry with specific local features including a cylindrical matching element and strategically placed shorting pins. These local structural qualities are optimized to maintain omnidirectional radiation patterns while supporting dual band operation, ensuring efficient coverage in both 2.4 GHz and 5 GHz bands

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8963793B2Dual band antenna design

Publication Date: 2015.02.24 CISCO TECHNOLOGY INC

AI summary

Disclosed in an example embodiment herein is a dual mode patch antenna designed to operate in the TM02 mode. The antenna comprising a circular patch antenna configured to operate at a first frequency, and a cylindrical matching element coupled to the circular patch antenna configured to operate at a second frequency. A feed surface is coupled to the cylindrical matching element.