Compact WLAN dual-band filter using independent band stop resonators combined with diplexer

2011 IEEE MTT-S International Microwave Workshop Series on Intelligent Radio for Future Personal Terminals Pub Date : 2011-09-26 DOI:10.1109/IMWS2.2011.6027209

J. Park, S. Cheon, Jae Y. Park, Jeong-Taek Lim

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引用次数: 3

Abstract

In this paper, a highly miniaturized dual-band band pass filter has firstly been developed by embedding all the passive lumped elements into a LTCC substrate for 2.4–2.5 GHz (802.11b) and 5.15–5.85 GHz (802.11a/g) WLAN applications. In order to reduce a size/volume of the filter and improve its performances, the proposed filter was newly designed by using J-inverter transformation technology, independent transmission zero technology and independent band-stop resonators. The J-inverter transformation technology was highly effective to minimize electromagnetic parasitic coupling between the large inductors. The newly applied independent band-stop resonator helped to reduce the number of passive elements in the filter circuit. Finally, designed dual-band filter was combined with simple LC diplexer. The measured maximum insertion losses of the fabricated dual-band WLAN filter were better than 2.3 and 1.3 dB in the lower and upper pass-bands, respectively. Return loss was higher than 15 dB. The overall size/volume of the fabricated filter module was 4.7 × 2.3 × 0.68 mm3

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紧凑的WLAN双带滤波器采用独立带阻谐振器与双工器相结合

在本文中，通过将所有无源集总元件嵌入LTCC衬底中，首次开发了一种高度小型化的双带带通滤波器，用于2.4-2.5 GHz (802.11b)和5.15-5.85 GHz (802.11a/g) WLAN应用。为了减小滤波器的尺寸/体积，提高其性能，采用j型逆变器变换技术、独立传输零技术和独立带阻谐振器对该滤波器进行了全新设计。j型逆变器变换技术可以有效地减小大型电感之间的电磁寄生耦合。新应用的独立带阻谐振器有助于减少滤波器中无源元件的数量。最后，将设计好的双带滤波器与简单的LC双工器相结合。所制备的双频WLAN滤波器在下通带和上通带的最大插入损耗分别优于2.3和1.3 dB。回波损耗大于15 dB。制备的滤波模块的总体尺寸/体积为4.7 × 2.3 × 0.68 mm3

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来源期刊

2011 IEEE MTT-S International Microwave Workshop Series on Intelligent Radio for Future Personal Terminals

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