Quad-band PCB Antenna Multi-band Resonance
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Solution Overview
Problem
Current security system components, particularly those used in different regions, require separate printed circuit boards (PCBs) due to varying GSM bands, necessitating a compact quad-band surface mount antenna for wireless communication that can accommodate multiple frequency bands.
Innovation Solution
A planar quad-band surface mount antenna design featuring a ground plane, feed line, and radiating element, which operates in three resonant modes to support GSM 850, GSM 900, GSM 1800, and GSM 1900 frequency bands using a single feed line and adjustable configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate PCBs are used for different GSM bands, then wireless communication reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements a single PCB antenna structure that supports multiple GSM frequency bands (850, 900, 1800, 1900 MHz) through four distinct resonant modes. The antenna achieves multi-functionality by configuring the radiating element with specific length ratios (L1:L2:L3:L4 = 1:0.95:0.55:0.5) and using a ground plane with strategically placed slots that create different resonant frequencies, allowing one antenna to replace what would traditionally require four separate antennas for each band
2Ease of operation
If antenna size is reduced for compact security systems, then ease of installation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent transitions from three-dimensional antenna structures to a two-dimensional planar design where the radiating element and ground plane are fabricated on the same PCB layer. This dimensional reduction simplifies assembly and installation while maintaining precise electrical characteristics through carefully controlled trace lengths and geometries that achieve the required resonant frequencies for multiple GSM bands
3Device complexity
If single PCB is used for all GSM bands, then device complexity is reduced, but achieving reliable multi-band communication becomes more difficult
Solution Approach 1:
The patent achieves reliable multi-band communication on a single PCB by systematically adjusting key parameters: the radiating element is divided into four sections with specific length ratios (L1:L2:L3:L4 = 1:0.95:0.55:0.5), the ground plane incorporates slots with specific dimensions, and feed line impedances are optimized. These parameter changes create four distinct resonant modes that correspond to the four GSM frequency bands, enabling reliable communication across all bands through a unified antenna structure
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
Enables compact, versatile wireless communication capabilities across different frequency bands, facilitating the integration of security systems in various regions with reduced component size and complexity.
Implementation Method 1
operates in three resonant modes to support GSM 850, GSM 900, GSM 1800, and GSM 1900 frequency bands
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
A surface mount antenna includes a ground plane, a feed line, and a radiating element. The ground plane extends in a first direction on a first side of a substrate. The feed line extends in a second direction on a second side of the substrate. The radiating element includes a plurality of segments disposed on the first side of the substrate and is configured to resonate in a plurality of frequency modes.