Tri-frequency Multi-polarisation Omnidirectional Antenna Design
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Solution Overview
Problem
Current technologies cannot simultaneously provide multiple frequencies and polarizations for improved Wi-Fi coverage, requiring multiple antennas to achieve this.
Innovation Solution
A tri-frequency multi-polarisation omnidirectional antenna design featuring concentric electrically conducting loops and a dielectric resonator with a conductive probe, allowing operation at 2.4, 5.2, and 5.8 GHz frequencies in both TE and TM modes for dual orthogonal polarizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are employed to provide multiple frequencies and polarizations, then Wi-Fi coverage is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple antenna functions into a single integrated structure. The concentric loops (outer loop for 2.4 GHz, middle loop for 5.2 GHz, inner loop for 5.8 GHz) and dielectric resonator with probe are merged into one omnidirectional antenna assembly that simultaneously supports three frequency bands and both TE and TM polarizations, eliminating the need for multiple separate antennas
Solution Approach 2:
The single antenna structure is designed to perform multiple functions: it operates across three frequency bands (2.4 GHz, 5.2 GHz, 5.8 GHz), supports both horizontal (TE) and vertical (TM) polarizations, and provides omnidirectional coverage. This multi-functional design allows one antenna to replace what would traditionally require multiple specialized antennas
2Device complexity
If a single antenna is designed to operate at multiple frequencies, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent achieves multi-frequency operation by systematically varying geometric parameters of the concentric loops. The outer loop has larger dimensions optimized for 2.4 GHz, the middle loop has intermediate dimensions for 5.2 GHz, and the inner loop has smaller dimensions for 5.8 GHz. The power dividers are also designed with specific impedance values (50Ω, 100Ω, 200Ω) to match different frequency requirements, allowing precise frequency control through parameter optimization
3Adaptability or versatility
If concentric loops with different diameters are used for different frequencies, then frequency coverage is improved, but area occupied increases
Solution Approach 1:
The patent employs a nested concentric loop structure where three loops of different sizes are arranged one inside another on the same substrate plane. The outer loop (largest diameter) contains the middle loop, which in turn contains the inner loop (smallest diameter). This nesting arrangement allows three different frequency bands to be supported within a compact circular footprint, efficiently utilizing the substrate 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
The antenna provides enhanced Wi-Fi coverage by operating simultaneously at three frequencies with dual polarizations, maintaining compactness and simplicity in manufacturing while ensuring uniform signal coverage.
Implementation Method 1
a first plurality of curved electrically conductive strips arranged on the first face and being arranged to form an outer loop... a second plurality of curved electrically conductive strips arranged on the first face and being arranged to form an inner loop... a third plurality of curved electrically conductive strips arranged on the first face and being arranged to form middle loop
Implementation Method 2
an electrically conductive probe extending at least part way along the symmetry axis through the dielectric resonator to excite vertically polarised TM modes in the dielectric resonator at a plurality of frequencies
Data Source
AI summary
A tri-frequency multi-polarisation omnidirectional antenna comprising: a first plurality of curved electrically conductive strips arranged on the first face and being arranged to form an outer-loop; second plurality of curved electrically conductive strips arranged on the first face and being arranged to form an inner-loop; third plurality of curved electrically conductive strips arranged on the first face and being arranged to form middle-loop; a first power divider and a second power divider each connected to the strips of the inner-loop; a dielectric resonator comprising a first face, the first face arranged on the first face of the substrate; an electrically conductive probe being arranged at least partially within the dielectric resonator and extending at least part way along the symmetry axis.