In this paper, a novel meta‐grounded planar bandpass filter is presented, facilitating much broader upper stopband. The proposed filter is comprised of a strip layer on the top, a dielectric laminate in the middle and a meta‐grounding layer on the bottom. The strip on the top consists of three cross‐shaped resonators in cascade. Instead of perfect conducting ground, a meta‐ground, composed by a group of metallic mushroom lattices with different characteristic dimensions, is proposed for broadening the upper stopband. In order to validate the proposed concept, we design and fabricate a prototype filter with a center frequency of 11.6 GHz, which exhibits an extremely broad upper stopband from 17.6 GHz to 72.2 GHz with a rejection level greater than 20 dB.

中文翻译：

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具有宽上阻带的亚接地带通滤波器

在本文中，提出了一种新型的亚接地平面带通滤波器，可简化更宽的上阻带。拟议的滤波器由顶部的带状层，中间的绝缘层和底部的超接地层组成。顶部的条由三个级联的十字形谐振器组成。代替理想的导电接地，有人提出了由一组具有不同特征尺寸的金属蘑菇晶格组成的金属接地层，以拓宽上部阻带。为了验证所提出的概念，我们设计并制造了中心频率为11.6 GHz的原型滤波器，该滤波器在17.6 GHz至72.2 GHz的频率范围内具有极宽的上阻带，其抑制级大于20 dB。