Multi-band Antenna with Coupled Radiating Units for LTE Coverage
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Solution Overview
Problem
Conventional penta-band antennas fail to adequately support the expanded frequency requirements of both conventional third-generation mobile communication systems and Long Term Evolution (LTE) technology, particularly in providing comprehensive coverage across multiple frequency bands.
Innovation Solution
A multi-band antenna design featuring a single-pole radiating portion and a coupling radiating portion, with specific bending configurations to create current paths that cover frequencies from 700 MHz to 2500 MHz, allowing for integration into mobile communication devices to support both GSM and LTE bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional penta-band antenna is used, then the antenna structure is simple, but it cannot provide adequate coverage for both third-generation mobile communication and LTE technology frequency bands
Solution Approach 1:
The antenna is divided into multiple radiating units (first, second, third, and fourth radiating units) with different geometric configurations. Each radiating unit is designed to resonate at specific frequency bands, allowing the antenna to cover both third-generation (850 MHz, 900 MHz, 1800 MHz, 1900 MHz, 2100 MHz) and LTE (700 MHz, 750 MHz, 800 MHz) bands simultaneously while maintaining a relatively compact overall structure.
2Adaptability or versatility
If multiple radiating units are added to expand frequency coverage, then the frequency band coverage is improved, but the antenna structure becomes more complex
Solution Approach 1:
Multiple radiating units are integrated into a single antenna structure that shares common feeding mechanisms and grounding systems. The first radiating unit connects to the feeding terminal directly, while the second and third radiating units are coupled through parasitic coupling and geometric arrangements. This merging approach allows multiple frequency bands to be covered without requiring completely separate antenna elements for each band.
Solution Approach 2:
The antenna structure is designed so that the same physical components serve multiple functions across different frequency bands. The radiating units are configured to resonate at multiple frequencies, and the coupling between units enables a single structure to handle both third-generation and LTE communications, making the antenna universally applicable to multiple communication standards.
3Adaptability or versatility
If the antenna is designed to cover expanded frequency ranges, then the bandwidth coverage is improved, but the impedance matching becomes more difficult
Solution Approach 1:
Different portions of the antenna structure are designed with specific geometric properties optimized for their respective frequency ranges. The first radiating unit has dimensions and configurations tailored for third-generation bands, while the second and third radiating units are shaped to resonate at LTE frequencies. This localized optimization of geometric properties allows each section to achieve good impedance matching at its target frequencies while contributing to overall broadband coverage.
Data Source
AI summary
A multi-band antenna comprises a single-pole radiating portion and a coupling radiating portion coupled to a grounding terminal. The single-pole radiating portion has a first radiating unit and a fourth radiating unit coupled to a feeding terminal. The single-pole radiating portion is bent to form a second radiating unit and a third radiating unit. The coupling radiating portion has a fifth radiating unit, and the coupling radiating portion is bent to form a sixth radiating unit. The sixth radiating unit of the coupling radiating portion and the third radiating unit of the single-pole radiating portion are coupled to each other to generate a LTE technology band near 700 MHz. The fifth radiating unit of the coupling radiating portion, the third radiating unit and the fourth radiating unit of the single-pole radiating portion are coupled to each other to generate a high frequency band.