Compact LTCC Balanced Multicoupled Line Bandpass Filter with Enhanced Stopband Characteristic
This paper proposes a compact balanced multicoupled line bandpass filter that is widely used in Bluetooth and wireless LAN transceiver system with enhanced stopband characteristic. The device works as a balun as well as a bandpass filter at the same time. The proposed filter is configured by using modified resonators which provide a transmission zero located at upper stopband frequency. A parallel resonator is used at input port to produce a transmission zero at the lower stopband. Thus, traditional coupled-resonator filter theory can be used to design and analyze such the device, which can obtain excellent bandpass transmission characteristic. A 2.45GHz balanced multicoupled bandpass filter with a size of 1.8mm×1.25mm×0.9mm has been implemented in a multilayered low-temperature co-fired ceramic (LTCC) substrate. The simulated results are that the maximum of 0.4 dB amplitude imbalance and maximum 3.2° of phase imbalance are achieved in the passband, respectively. The zeros are located in the 1.7 GHz and 4.8 GHz, provided suppressions more than 40 dB.
Pinxiang Yang Yali Qin Guangxin Zhu
Institute of Fiber-optic Communication and Information Engineering, College of Information Engineering, ZhejiangUniversity of Technology, Hangzhou 310023, China
国际会议
第九届国际天线、电波传播及电磁理论学术研讨会(ISAPE2010)
广州
英文
1-4
2010-11-29（万方平台首次上网日期，不代表论文的发表时间）