Distributed comb tapped multiband antenna design
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Solution Overview
Problem
The challenge is to create a compact antenna structure for wireless communication devices that can operate over multiple non-harmonically related frequency bands within a single device housing, while minimizing space and maintaining high performance, as separate antennas for each frequency band conflict with the trend of smaller device sizes.
Innovation Solution
A multiband antenna structure with a distributed comb-tapped design, utilizing a PIFA-like radiator and reactive elements, connected by a single transmission line, which allows for high performance across multiple frequency bands through a lattice equivalent circuit and adjustable tap structures, enabling dynamic tuning for optimal impedance and radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate antennas are provided for each operating frequency band, then the device can accommodate multiple frequency bands and operating modes, but the device size and volume increase
Solution Approach 1:
The patent combines multiple antenna elements (first and second antenna elements) into a single integrated antenna structure that can operate across multiple frequency bands. The antenna elements are positioned at different locations along the transmission line, allowing a single physical structure to serve multiple frequency bands simultaneously, thereby reducing device volume while maintaining multi-band adaptability
Solution Approach 2:
The antenna structure is designed to perform multiple functions by operating across different frequency bands (first frequency band and second frequency band) using the same physical antenna elements. The transmission line feeds both antenna elements, enabling a single antenna system to provide universal coverage for multiple operating modes and frequency bands
2Volume of moving object
If a single transmission line is used to connect the antenna structure, then the device volume is reduced, but the antenna must maintain high performance over considerable bandwidth in multiple non-harmonically related frequency bands
Solution Approach 1:
The patent applies local quality by positioning antenna elements at specific locations along the transmission line and using reactive elements at different positions to independently tune each antenna element's impedance. This allows each local region of the antenna structure to be optimized for specific frequency bands while maintaining overall multi-band performance through the single transmission line connection
Data Source
AI summary
A distributed comb tapped multiband antenna structure includes a PIFA-like antenna radiator having tap structures, and a counterpoise to the antenna radiator, wherein the tap structures include shunt connections to the counterpoise. A second antenna radiator is collinear and opposing the antenna radiator while sharing the counterpoise in common with the antenna radiator, such that the antenna structure is configured as a balanced dipole. The antenna structure can be contained internally within a single device housing and can operate over multiple frequency bands. The antenna provides high performance over a considerable bandwidth within each of the multiple frequency bands of operation, even where the frequency bands are not harmonically related.