Td-scdma Dual-band Antenna Design And Implementation Of Ltcc Chip

With rapid development of modern wireless communication technology, theincreasing expand of multiple mobile radio communication services makes the need forminiature multiple and broad frequency band antenna more and more urgent. The timelyappearance of LTCC technology broadens people’s horizons. By virtue of the excellentmaterial performance (such as high dielectric constant and low dielectric loss) and thefeasibility of three-dimensional structure (including multi-layer structure and verticalinterconnection), new technical ways have been opened for miniaturization andmulti-frequency technology of antennas. Inspired by the designing idea of conventionalminiaturized multi-frequency antennas, two novel structures of small dual-frequencyLTCC antenna (helix-meander line dual-frequency antenna and dual-helix meander linedual-frequency antenna) are proposed, while the characteristics and design methods ofantennas are analyzed and discussed in this paper. The major contributions are listed asfollows：1. The related theory of miniaturized LTCC antenna is researched at first. Due toboth of the dual-band antennas researched in this dissertation are electronic smallantennas，the fundamental principles such as definition，performance parameters，physical limitations and resonance characteristic of the electronic small antenna aresummarized and illustrated in the first place. Then the dual-band or multi-bandtechnology and miniaturized technology of conventional small antennas are alsoresearched and summarized.2. A new design of helix-meander dual-band antenna for F and A band ofTD-SCDMA application by LTCC technology is proposed. Studying from the helixmonopole and meander line monopole to the research of helix-meander antenna, leadsto the helix-meander dual-band antenna. By analyzing the simulated data, the effects ofparameters to the characteristic of the antennas are analyzed. Finally, through theresearch and analysis of helix-meander dual-band antenna, designing idea and methodsof this kind of antenna is summarized, and then finished the design of dual-band LTCCchip antenna. 3. The structure of double helix-meander dual-band antenna is proposed in order tomeet the application of F, A, E band in TD-SCDMA system. By researching andsummarizing the traditional methods of expanding the bandwidth of monopole antenna,the structure of double helix-meander dual-band antenna is put forward. Then, using themethod of capacitive loading, improved the bandwidth of double helix-meander antenna.Based on the structure, a meander resonant branch is employed to realizedual-resonance, and then the structure of double helix-meander dual-band antenna iscompleted. Finally, the characteristic of the double helix-meander dual-band antenna isanalyzed, and the detailed design steps of this kind of antennas are given. Using thismethod, a compact dual-band LTCC chip antenna is finished at last. The lower band ofthe antenna covers the both of F and A band while the higher band meets therequirement of E band.