Lte/gsm/umts Multiband Antenna Research And Design Of Wireless Data Card

With the large-scale laying of the third-generation mobile communication systems and the steady development of the long-term evolution, the new LTE mobile terminals, especially for wireless data card applications which will be applied widely in the3th generation and even the4th LTE time, will face compatibility issues in the design. This is because that the new generation LTE mobile communication systems not only meet the new LTE standard’s operating bands of LTE700/2300/2500, but also cover the primary operating bands of GSM850/900/1800/1900and UMTS2100in the2th (for instance GSM) and the3th (for instance UMTS, CDMA and so on) generation. Owing to that the theoretically ultimate performances of an antenna are limited for the less and less overall sizes, however, realizing a wireless data card antenna operating at kinds of modes and the whole frequency bands (LTE/GSM/UMTS) appears very difficult. For this purpose, the studies are carried out about how to achieve the LTE/GSM/UMTS multi-band wireless data card antennas by wideband matching network techniques, loading lumped elements techniques and distributed elements matching techniques. In detail, the article concludes the following sections mainly:First of all, the background and the developments of wireless data card antennas are described briefly, and main innovations are also introduced in the paper. For the design considerations of common wireless data card antennas, some important external parameters of the antennas are discussed. Based on the inherent traits of the wireless data card applications, common considerations about the designs of wireless data card antennas are presented. Further, the operating principle and use of the three main wideband techniques in the proposed antennas, including the wideband matching network technique, loading lumped elements technique and distributed elements matching technique, are studied and analyzed in detail, which give groundwork for the next studies.Then, aiming at the wideband matching network techniques and considering the designed issues of wireless data card antennas, a antenna design and simulated model operating for LTE/GSM/UMTS multi-band wireless data card applications is proposed. Main parameter effects and measured results indicate that the designed antenna is promising for wireless USB dongle applications.Moreover, with different effects on the input impedance matching of desired antennas by employing kinds of lumped elements, another new LTE/GSM/UMTS multi-band wireless data card antenna is successful achieved by loading chip elements in the proper place of the antenna radiators and making theoretical analysis and model optimization. Besides, the proposed antenna is fabricated and measured in the experiment, where the effects of the tested cable and different locations of the measured antenna in the microwave chamber on the radiation performances are also discussed in the paper.Finally, in the paper, the different appearances of the terminal antennas by using distributed or lumped elements are given. Again the3th antenna for LTE/GSM/UMTS multi-band wireless data card applications is also realized by arranging different distributed elements to adjust the input impedance matching of the antenna. The analysis of the key parameters and measured results suggests that the use of distributed elements presents large impact on the desired antenna’s achievement.