Compact Capacitive Antenna Structure for Wideband Mobile Terminals
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Solution Overview
Problem
Current antenna designs face challenges in achieving a high bandwidth within a smaller form factor, particularly as fourth-generation mobile communications require more efficient signal propagation and energy radiation in compact terminal products.
Innovation Solution
The design incorporates a first radiator and capacitor structures that generate resonance frequencies by forming left-hand and composite right-hand transmission line configurations, allowing for multiple resonance frequencies within a compact size, including LTE bands, while maintaining an electrical length less than one eighth of the wavelength corresponding to the resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna electrical length is reduced to fit in smaller terminal products, then the antenna volume is reduced, but the bandwidth coverage is limited
Solution Approach 1:
The patent applies parameter changes by introducing capacitor structures that modify the electrical characteristics of the radiator. By adjusting the capacitance values and configurations (series/parallel arrangements), the antenna achieves multiple resonance frequencies (first, second, and third resonance frequencies) while maintaining a physically compact size. This allows the electrical length to be effectively extended beyond the physical dimensions, enabling wide bandwidth coverage in a small volume.
Solution Approach 2:
The patent employs composite structures by combining the radiator with capacitor structures to form a composite antenna system. This composite configuration creates left-hand transmission line and composite right-hand transmission line structures that support multiple resonance modes, allowing the antenna to cover multiple frequency bands (including LTE, WCDMA, GSM) while maintaining a reduced physical size.
2Adaptability or versatility
If multiple frequency bands are covered, then the bandwidth is increased, but the antenna size increases
Solution Approach 1:
The patent segments the antenna function by creating distinct resonance paths through the capacitor structures. The first capacitor structure generates a first resonance frequency for lower bands, while the second capacitor structure generates a second resonance frequency for higher bands. This segmentation allows independent optimization of different frequency band responses within a unified compact structure, achieving multi-band coverage without proportional size increase.
Solution Approach 2:
The patent transitions from traditional single-dimension resonance to multi-dimensional resonance by introducing multiple capacitor structures that create different electrical paths. The combination of series and parallel capacitor arrangements creates multiple resonance dimensions (first, second, and third resonance frequencies) within the same physical space, enabling wide bandwidth coverage without increasing the antenna's physical footprint.
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 approach enables the antenna to cover a wide range of frequency bands, including low and high frequencies, such as GSM, WCDMA, UMTS, and LTE, while reducing the antenna's volume, thereby improving performance and accommodating the requirements of smaller mobile terminal designs.
Implementation Method 1
an antenna implements both signal propagation and energy radiation based on resonance of a frequency
Implementation Method 2
an antenna implements both signal propagation and energy radiation based on resonance of a frequency
Data Source
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AI summary
The present invention relates to the field of antenna technologies, and discloses an antenna and a mobile terminal, to resolve a problem of designing the antenna in relatively small space. The antenna includes a first radiator (2) and a first capacitor structure (3); a first end (21) of the first radiator (2) is electrically connected to a signal feed end (11) of a printed circuit board (1) by means of the first capacitor structure (3), a second end (22) of the first radiator (2) is electrically connected to a ground end (12) of the printed circuit board (1), the first radiator (2), the first capacitor structure (3), the signal feed end (11), and the ground end (12) form a first antenna, configured to generate a first resonance frequency, and an electrical length of the first radiator is less than or equal to one eighth of a wavelength corresponding to the first resonance frequency.