基于LTCC技术超小型宽带巴伦的设计与实现

Design and Implementation of a Miniature Broadband Balun Based on LTCC

介绍了一种基于LTCC(低温共烧陶瓷)技术的超小型宽带巴伦的设计与实现。该巴伦由Marchand微带巴伦改进而来,综合采用LTCC多层立体三维集成结构,螺旋线宽边耦合带状线结构(SBCS)和带状线末端电容加载技术来实现宽带巴伦的小型化。最终设计出了一款频带0.9～2.3GHz,尺寸仅为1.8mm×1.2mm×1.0mm,插损小,幅度平坦度好,相位一致性高,各项性能均优的宽带巴伦。讨论了该款巴伦的设计思路、工作原理、三维结构,最后给出了该款巴伦的仿真和测试结果,两者一致性较好。

A novel miniature broadband balun based on LTCC is designed and presented in this paper. This kind of balun is derived from Marchand microstrip balun. For the realization of miniaturization, LTCC muhilayer 3D structure, spiral broadband coupling stripline structure （SBCS） and capacity end-loaded stripline structure all have been applied comprehen- sively. Discussion about the design thought, operation theory and 3D model are proposed. The operation frequency ranges from 0.9 GHz to 2.3 GHz. The balun is fabricated and measured with the dimension of 1.8mm×1. 2mm×1. 0mm. Measured results show the performance is all right. The return loss is low, amplitude balance is fine and phase consistency is good. The results from the simulation and those from the measurement are in good agreement.