Printed Compound Loop Antenna with Orthogonal Fields
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Solution Overview
Problem
Existing antenna designs, particularly small loop antennas, face limitations in efficiency and bandwidth due to their physical constraints, leading to sub-optimal performance in both transmit and receive modes, with compound field antennas being complex to implement and requiring expensive substrates.
Innovation Solution
A single-sided, compound loop antenna design that incorporates a magnetic loop and an electric field radiator, with the series resonant circuit coupled orthogonally to the magnetic loop, allowing for efficient operation in both transmit and receive modes, utilizing microstrip construction techniques and inexpensive substrates like FR-4 for improved efficiency and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If small loop antennas are used to reduce device size, then the device dimensions are reduced, but the radiation efficiency and bandwidth deteriorate significantly
Solution Approach 1:
The patent combines a magnetic loop antenna and an electric dipole antenna into a single integrated structure. The magnetic loop provides magnetic field radiation while the electric dipole provides electric field radiation, and their combination creates a compound antenna that achieves superior radiation efficiency compared to small loop antennas alone, while maintaining compact size.
Solution Approach 2:
The patent uses a composite antenna structure that integrates two different antenna types (magnetic loop and electric dipole) with different radiation characteristics. This composite approach allows the antenna to overcome the limitations of individual small loop antennas by combining their respective strengths in a unified structure.
2Device complexity
If simple loop antennas are used, then the device complexity is reduced, but the bandwidth and radiation intensity are limited
Solution Approach 1:
The patent merges a magnetic loop antenna and an electric dipole antenna into a compound structure that operates in both transmit and receive modes. This combination excites both transverse magnetic (TM) and transverse electric (TE) modes, thereby increasing bandwidth and radiation intensity while maintaining relatively simple implementation through printed circuit board integration.
3Loss of energy
If compound field antennas are used to improve bandwidth and efficiency, then radiation performance is enhanced, but the implementation complexity and substrate cost increase
Solution Approach 1:
The patent implements a self-contained compound antenna structure where the magnetic loop and electric dipole are integrated into a single printed circuit board design. The antenna is self-resonant and does not require external matching networks or complex feeding structures, thereby reducing implementation complexity while maintaining high radiation efficiency.
Solution Approach 2:
The patent uses inexpensive printed circuit board substrates to implement the compound antenna structure, replacing costly specialized substrates or three-dimensional constructions. The printed circuit implementation allows for low-cost manufacturing while achieving the desired compound field radiation characteristics.
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 design achieves higher radiation intensity, gain, and efficiency, enabling wider bandwidth operation while reducing the complexity and cost of antenna implementation, making it suitable for mobile devices and other RF applications.
Implementation Method 1
incorporates a magnetic loop and an electric field radiator, with the series resonant circuit coupled orthogonally to the magnetic loop
Implementation Method 2
incorporates a magnetic loop and an electric field radiator, with the series resonant circuit coupled orthogonally to the magnetic loop
Implementation Method 3
series resonant circuit coupled orthogonally to the magnetic loop
Data Source
AI summary
The present invention relates to printed or single-sided compound field antennas. The single-sided compound loop antennas have coplanar electric field radiators and magnetic loops with electric fields orthogonal to magnetic fields that achieve performance benefits in higher bandwidth (lower Q), greater radiation intensity/power/gain, and greater efficiency.