On the use of vias in conductor-backed coplanar circuits

被引：101
作者：
Haydl, WH [1 ]
机构：
[1] Fraunhofer Inst Appl Solid State Phys, D-79108 Freiburg, Germany
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2002年 / 50卷 / 06期
关键词：
conductor-backed CPW; CPW; millimeter wave; modes; vias;
D O I：
10.1109/TMTT.2002.1006419
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Ground planes of conductor-backed coplanar waveguides (CBCPWs) behave like overmoded patch antennas supporting parallel-plate modes and show numerous resonances. For typical monolithic-microwave integrated-circuit chip sizes, these unwanted resonance frequencies lie within the microwave and millimeter-wave frequency region. Due to this feedback mechanism, today's coplanar millimeter-wave amplifiers operating up to 250 GHz require special packaging techniques for stable operation. The use of vias is one method of suppressing parallel-plate modes. The effect of via-holes within a ground plane and the effect of an open or a shorted ground-plane periphery on the parallel-plate modes of CBCPWs were investigated in depth up to 200 GHz for quartz and GaAs substrates. It is shown that the placement of the vias within the coplanar-waveguide structure is crucial for the suppression of parallel-plate modes. If properly placed, vias are an effective means to suppress these unwanted modes over a chosen frequency range.
引用
收藏
页码：1571 / 1577
页数：7
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