Terminal Casing Orthogonal Antenna Isolation
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Solution Overview
Problem
In terminals with limited clearance areas, implementing two antennae with high isolation is challenging due to the need for inter-band carrier aggregation in LTE-A technology, where carriers are in different frequency bands, and existing solutions fail to effectively utilize metal frames for both low and high-frequency antennae.
Innovation Solution
A terminal casing design that includes a metal frame with a bottom frame divided into horizontal and perpendicular parts by gaps, where the first feeder unit and second feeder unit form orthogonally polarized antennae units within the limited clearance area, ensuring high isolation between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two separate antennae are implemented in the terminal for inter-band carrier aggregation, then the terminal can support LTE-A technology with carriers in different frequency bands, but the clearance area required for antenna installation increases
Solution Approach 1:
The patent combines two separate antennae into a single integrated antenna structure that uses one feeder unit with two feeding ports. This merging approach allows the terminal to support inter-band carrier aggregation while occupying only one clearance area, thereby resolving the contradiction between adaptability and area consumption.
Solution Approach 2:
The single antenna structure is designed to perform multiple functions by supporting both low-frequency and high-frequency carriers simultaneously through its dual-feeding mechanism. This multi-functional design enables the antenna to replace what would traditionally require two separate antenna installations.
2Area of stationary object
If a single antenna is replaced with a metal frame to reduce clearance area occupation, then the area consumption is reduced, but the isolation between antennae cannot be ensured for inter-band carrier aggregation
Solution Approach 1:
The metal frame is segmented into two distinct antenna units within the single antenna structure. Each unit corresponds to a specific frequency band (low-frequency and high-frequency), and they are spatially separated and orthogonally arranged to ensure sufficient isolation while maintaining the compact design.
Solution Approach 2:
Different portions of the metal frame are assigned different functions: one portion serves as the low-frequency antenna element and another portion serves as the high-frequency antenna element. This local differentiation ensures that each frequency band has its dedicated radiation element with appropriate isolation characteristics.
3Reliability
If the bottom frame is divided into horizontal and perpendicular parts for orthogonal antenna polarization, then high isolation between antennae is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent combines the functions of two separate metal frames into a single integrated bottom frame structure. This unified frame contains both the horizontal part and perpendicular part that form the orthogonal antenna units, simplifying manufacturing by eliminating the need to produce and assemble two separate frames while maintaining the isolation benefits.
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 design achieves high isolation between the low and high-frequency antennae, meeting LTE inter-band carrier aggregation requirements by utilizing the metal frame's geometry to create orthogonal polarization, thereby improving radiation efficiency and antenna performance.
Implementation Method 1
the first feeder unit and the horizontal part of the bottom frame form a first antenna unit, and the second feeder unit and any perpendicular part of the bottom frame form a second antenna unit orthogonal to the first antenna unit
Implementation Method 2
the two antennae are orthogonally polarized by virtue of a perpendicular relationship therebetween, high isolation between the two antennae is ensured
Data Source
Figure 1~1B
Figure 2~3
Figure 4~5
AI summary
The present disclosure provides a terminal casing and a terminal, and belongs to the technical field of communication. A bottom frame (101c) is divided into a horizontal part (101c-1) and two perpendicular parts (101c-2) by two gaps in the bottom frame (101c) of a metal frame (101); and a first feeder unit (102) and a second feeder unit (103) are arranged in a clearance area, the first feeder unit and the horizontal part of the bottom frame form a first antenna unit (106), and the second feeder unit and any perpendicular part form a second antenna unit (107) orthogonal to the first antenna unit.