Transformer-Coupled Antenna Layout for Harmonic Radiation Efficiency
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Solution Overview
Problem
The strengthening of electric field coupling between feeding and parasitic radiating elements in communication terminal apparatuses leads to insufficient radiation efficiency due to currents weakening each other, particularly in antenna devices designed for wide frequency ranges.
Innovation Solution
Incorporating a first and second coil coupled via an electromagnetic field and an inductor in series with the second coil to generate a (2n+1)th harmonic resonance, which counteracts the weakening effect of currents flowing through the second radiating element, enhancing radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the feeding radiating element and the parasitic radiating element are arranged close to each other to reduce antenna space, then the antenna space is reduced, but the electric field coupling between the elements is strengthened causing currents to weaken each other and radiation efficiency to decrease
Solution Approach 1:
The patent introduces an antenna coupling element as an intermediary component between the feeding radiating element and the parasitic radiating element. This coupling element includes a first coil and a second coil that define a transformer, mediating the electromagnetic coupling between the two radiating elements. The intermediary transformer allows controlled magnetic coupling while preventing harmful direct electric field coupling, thus maintaining radiation efficiency even when elements are arranged close together to reduce antenna space.
Solution Approach 2:
The patent replaces direct electric field coupling with magnetic field coupling through the transformer. By substituting the direct electromagnetic interaction with a transformed magnetic coupling mechanism, the system achieves controlled energy transfer without the harmful effects of direct electric field interaction, thereby preventing current weakening while maintaining compact antenna space.
2Adaptability or versatility
If an antenna coupling element implementing a transformer is used to cover a wide frequency range, then the usable frequency range is widened, but in compact arrangements the electric field coupling strengthens causing current weakening and reduced radiation efficiency
Solution Approach 1:
The antenna coupling element serving as a transformer acts as an intermediary that enables wide frequency range operation through controlled magnetic coupling. The transformer structure with first and second coils allows broadband operation while preventing direct electric field coupling between radiating elements, thus maintaining radiation efficiency across the wide frequency range.
Solution Approach 2:
The patent utilizes parameter changes in the transformer coupling to achieve wide frequency range operation. By adjusting the coupling parameters of the transformer (first and second coils), the system can operate efficiently across multiple frequency bands while the intermediary transformer structure prevents harmful direct electric field coupling that would cause current weakening.
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 solution significantly reduces or prevents a decrease in radiation efficiency by ensuring currents at the (2n+1)th harmonic resonate effectively, thereby maintaining high radiation efficiency across a communication frequency range.
Implementation Method 1
a first coil coupled to at least one of the first radiating element and a feeding circuit, a second coil coupled to the second radiating element and coupled to the first coil via an electromagnetic field
Implementation Method 2
The first radiating element and the second radiating element are coupled to each other via an electric field
Implementation Method 3
The inductor is coupled in series with the second coil to generate the resonant frequency of the resonance circuit to be set at a frequency of a (2n+1)th harmonic, where n is an integer equal to or greater than 1
Data Source
AI summary
An antenna device includes first and second radiating elements, a first coil coupled to the first radiating element or a feeding circuit, a second coil coupled to the second radiating element and coupled to the first coil via an electromagnetic field, and an inductor. The first and second radiating elements are coupled to each other via an electric field. The harmonic resonant frequency of a resonance circuit defined by a transformer defined by the first coil and the second coil, the inductor, and the second radiating element exists within a communication frequency range. The harmonic resonant frequency is a (2n+1)th harmonic frequency, where n is an integer equal to or greater than 1.