Multi-band Antenna with Coupling Arm for Low Insertion Loss
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Solution Overview
Problem
Conventional electronic devices require multiple antennas for different frequency bands, leading to complexity and inefficiency, with dual-band inverted-F antennas becoming obsolete due to the need for a single unitary multi-band antenna covering broader frequency bands while maintaining low insertion loss for signal diversity.
Innovation Solution
A multi-band antenna design featuring a ground plane and radiating unit with L-shaped, U-shaped, feed-in, and coupling arms, allowing for capacitive coupling and impedance matching across multiple frequency bands, including 2.3-2.7 GHz, 3.3-3.8 GHz, and 5.15-5.875 GHz, with parasitic elements for broader coverage and reduced insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are used for different frequency bands, then frequency band coverage is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple antenna functions into a single multi-band antenna structure that can operate across WLAN (2.4-2.5 GHz and 5.15-5.875 GHz) and WiMAX (3.3-3.8 GHz) frequency bands simultaneously, reducing the total number of antennas from multiple separate antennas to one integrated unit
Solution Approach 2:
The antenna design achieves multi-functionality by enabling a single antenna to cover multiple frequency bands (WLAN 2.4 GHz, WLAN 5 GHz, and WiMAX 3.5 GHz) through carefully designed radiating elements and ground plane configurations, allowing one antenna to perform the work of multiple specialized antennas
2Area of stationary object
If multiple antennas are placed close together, then space is saved, but insertion loss increases and signal diversity deteriorates
Solution Approach 1:
The antenna structure is segmented into distinct radiating elements (first radiating arm, second radiating arm, third radiating arm) and ground plane segments that are spatially separated and oriented at different angles, allowing each element to operate semi-independently across different frequency bands while maintaining low mutual coupling and insertion loss
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement with radiating arms extending in different directions and orientations, creating separation in multiple dimensions rather than simply placing antennas close together in a planar arrangement, thereby reducing mutual interference while saving space
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 multi-band antenna enables efficient wireless communication across multiple frequency bands, including WLAN and WiMAX, with reduced insertion loss between antennas, facilitating better signal diversity and broader frequency coverage.
Implementation Method 1
The coupling arm includes a main coupling segment electrically connected to the connecting segment and projectively overlapping the first and second free end portions in the first direction
Data Source
AI summary
A multi-band antenna includes a ground plane, and a radiating unit including an L-shaped first radiating arm, a U-shaped second radiating arm, a feed-in arm and a coupling arm. The first and second radiating arms are connected to the ground plane, and have respective free end portions that are spaced apart from and overlap the ground plane, that face each other, and that define an opening in spatial communication with an inner space defined by the first and second radiating arms and the ground plane. The feed-in arm is disposed in the inner space between the first radiating arm and the ground plane, is connected to the ground plane, and overlaps the opening. The coupling arm is connected to the connecting segment, and overlaps the free end portions.