Multimode Broadband Antenna Module Coupling Capacitance
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Solution Overview
Problem
Existing antennas, such as the planar inverted F antenna (PIFA), face a challenge in achieving a broad working bandwidth while maintaining a thin structure, as increasing the height of the antenna to broaden its bandwidth contradicts the requirement for a thin mobile device form factor.
Innovation Solution
A multimode broadband antenna module is designed with a printed circuit board, a first radiator, and a second radiator, where a coupling capacitance effect is formed between the radiators to broaden the working frequency range, allowing for a smaller thickness and thus meeting the requirement for a thin structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the height of the PIFA antenna is increased to broaden its working bandwidth, then the bandwidth characteristic is improved, but the thickness of the wireless terminal increases
Solution Approach 1:
The antenna is divided into two separate radiators (first radiator and second radiator) that are coupled together. Each radiator can be designed with optimized dimensions for specific frequency ranges, allowing the overall system to achieve broad bandwidth without increasing the terminal thickness. The segmentation enables independent optimization of each radiator's electrical length while maintaining a compact form factor.
Solution Approach 2:
The two radiators are positioned in close proximity to each other, with one radiator effectively nested within the spatial envelope of the other. This nested arrangement allows the radiators to couple electromagnetically, creating a combined resonant system that achieves broad bandwidth coverage while maintaining a compact thickness suitable for thin wireless terminals.
2Adaptability or versatility
If multiple resonance frequencies are implemented in one antenna, then the multimode capability is improved, but the structural complexity increases
Solution Approach 1:
The coupled radiator structure serves multiple functions simultaneously: each radiator can resonate at different frequencies, and their coupling creates additional resonant modes. This universal design allows a single antenna system to support multiple frequency bands and communication standards without requiring separate antenna elements for each function, thereby achieving multimode capability while controlling structural complexity.
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 effectively broadens the working frequency range of the antenna module while maintaining a thin profile, enabling it to cover multiple frequency bands and meet the design constraints of mobile devices like smartphones.
Implementation Method 1
a first predetermined distance exists between the low frequency portion of the first radiator and the low frequency portion of the second radiator, and a second predetermined distance exists between the high frequency portion of the first radiator and the high frequency portion of the second radiator, so as to form a coupling capacitance effect between the first radiator and the second radiator
Data Source
AI summary
A multimode broadband antenna module and a wireless terminal are provided. The multimode broadband antenna module includes a printed circuit board and an antenna body, where the antenna body includes a first radiator and a second radiator that are electrically connected to the printed circuit board, where the first radiator includes a connection portion, a low frequency portion, and a high frequency portion, the second radiator includes a grounding portion, a low frequency portion, and a high frequency portion, and a first predetermined distance exists between the low frequency portion of the first radiator and the low frequency portion of the second radiator, and a second predetermined distance exists between the high frequency portion of the first radiator and the high frequency portion of the second radiator, so as to form a coupling capacitance effect between the first radiator and the second radiator.