The dual G-type ultra-wideband built-in antenna for mobile phones introduced in this article is compact, measuring 38mm in length, 3.5mm in width, and 4mm in height. This innovative internal antenna is designed to support a wide range of frequency bands, including CDMA800, GSM900, DCS1700, PCS1900, and WCDMA2100. The design was simulated and optimized using CST Microwave Studio software, ensuring excellent performance and strong potential for commercial application.
1. Introduction
In recent years, with the rapid development of wireless communication technology, personalized and compact wireless devices have become increasingly popular. To meet aesthetic demands, modern smartphones are being made smaller and slimmer. As a result, reducing the size of the antenna while maintaining high performance has become a key trend in future mobile phone design. Most mobile phone antennas use omnidirectional linear polarization structures such as monopole antennas or planar inverted F antennas (PIFA), which are simple to integrate, cost-effective, and widely used. However, current multi-band monopole antennas often struggle to meet the required bandwidth specifications.
This paper presents a new type of built-in antenna that uses a high dielectric constant material as the antenna bracket, allowing for significant size reduction without compromising performance. The proposed double G-type antenna model covers multiple communication bands from CDMA800 up to WCDMA2100. The design process was carried out using CST Microwave Studio, a powerful tool for electromagnetic simulation and analysis.
Figure 1 shows the flattened geometry of the proposed antenna. It measures 38mm in length, 3.5mm in width, and 4mm in height, making it ideal for integration into modern slim smartphones.
2. Antenna Design and Structural Dimensions
Figure 2 illustrates the top view of the mobile phone substrate. The printed circuit board is made of FR4 fiberglass with a dielectric constant of 4.9, a thickness of 0.5mm, and dimensions of 100mm by 40mm. The ground area is fully covered, and the 50-ohm feed line has a width of 1.97mm. The antenna bracket is made of a special resin material with a dielectric constant of 7 and a loss tangent of 0.001, which makes it highly suitable for antenna applications. This material was sourced from research institutions in Tokyo, Japan.
Figure 3 presents the 3D model of the dual G-type antenna as simulated in CST Microwave Studio. This visualization helps in understanding the antenna’s structure and its interaction with the surrounding environment.
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