Dual Polarized Antenna Beamwidth Control

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Solution Overview

Problem

Existing dual-polarized antennas struggle to simultaneously achieve desired horizontal beamwidths for both vertical and horizontal polarizations, as existing designs do not provide individual control over beamwidths for each polarization.

Innovation Solution

The use of conductive parasitic strips and chokes in association with the main radiating antenna element allows for independent adjustment of beamwidths for vertical and horizontal polarizations, with conductive parasitic strips controlling the vertical polarization and chokes controlling the horizontal polarization, enabling equal beamwidths for both.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional antenna element dimensions and groundplane extension are used to adjust beamwidth, then beamwidth can be adjusted, but it cannot provide individual control over beamwidths for each polarization simultaneously

Engineering Contradiction:

Improveindividual beamwidth control for each polarizationVSAvoidantenna structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The antenna structure is segmented into distinct functional components: conductive parasitic strips for controlling vertical polarization beamwidth and chokes for controlling horizontal polarization beamwidth. This segmentation allows independent adjustment of beamwidth for each polarization without affecting the other, resolving the contradiction between adaptability and complexity by creating modular, polarization-specific control mechanisms.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parts of the antenna structure are assigned different functions: parasitic strips are placed in specific locations to control vertical polarization, while chokes are positioned to control horizontal polarization. This local differentiation enables individual beamwidth control for each polarization while maintaining a unified antenna structure, addressing the technical contradiction effectively.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If dual polarization is used on the same mechanical structure, then polarization diversity is achieved, but it becomes complicated to achieve desired horizontal beamwidth for both polarizations simultaneously

Engineering Contradiction:

Improvedual polarization capabilityVSAvoidbeamwidth adjustment difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The control mechanisms are segmented by polarization type: parasitic strips handle vertical polarization beamwidth control while chokes handle horizontal polarization beamwidth control. This segmentation transforms the complicated simultaneous adjustment problem into two independent, straightforward adjustment processes, significantly improving ease of operation while maintaining dual polarization capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Parasitic strips and chokes act as intermediary elements between the antenna elements and the polarized waves. These intermediaries provide the necessary control functions for each polarization independently, simplifying the overall adjustment process while achieving the desired beamwidth for both vertical and horizontal polarizations simultaneously.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution allows for precise tuning of beamwidths for both polarizations, ensuring equal horizontal beamwidth and pointing, and can be applied to any dual polarization configuration, simplifying the design and implementation process.

Implementation Method 1

arranging conductive parasitic strips in association with a main radiating antenna element to control the beam width of the vertical polarization

Methodology Applied

Scientific EffectConduction (electrical): Conduction (electrical)

Implementation Method 2

arranging at least two chokes in association with the main radiating antenna element to control the beamwidth of the horizontal polarization

Methodology Applied

Scientific EffectElectromagnetic field constraint:

Data Source

PatentEP2156510B1Polarization dependent beamwidth adjuster

Publication Date: 2016.06.08 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

The invention provides a dual polarized antenna or antenna array with a first and second radiation pattern having a first and second polarization, a method for adjustment of said antenna or antenna array and a wireless communication system comprising said antenna or antenna array. The antenna or antenna array comprises a main radiating antenna element or array of main radiating antenna elements arranged above a conductive frame. Then invention further provides an antenna or antenna array wherein a combination of conductive parasitic strips and chokes are arranged in association with the main radiating antenna element to achieve means for independently controlling beamwidths of the first and second radiation pattern a method for adjustment to achieve a desired beamwidth for each polarization, wherein the beamwidth adjustment for first and second radiation pattern is made independently of each other a wireless communication system including base stations equipped with a dual polarized antenna or antenna array according to the invention.