Broadband Substrate Integrated Waveguide Cavity-Backed Bow-Tie Slot Antenna
Broadband Substrate Integrated Waveguide Cavity-Backed Bow-Tie Slot Antenna
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DOI：
10.1109/lawp.2014.2330743
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发表时间：
2014-01-01
影响因子：
4.2
通讯作者：
Srivastava, Kumar Vaibhav
中科院分区：
文献类型：
--
作者：
Mukherjee, Soumava;Biswas, Animesh;Srivastava, Kumar Vaibhav
本文介绍了一种新型宽带基板集成波导腔背缝隙天线的设计方法。为了获得更宽的带宽性能，采用了领结型槽来代替传统的窄矩形槽。狭缝形状的改变有助于在腔内诱导强加载效应，并产生两个紧密间隔的混合模态，有助于获得宽带响应。该狭槽天线在单一基板中集成了薄腔背衬（高度< 0.03 λ(0)），因此保留了低轮廓平面结构，同时显示出具有中等增益的单向辐射特性。制作的样机带宽为1.03 GHz(9.4%)，带宽增益为3.7 dBi，前后比为15 dB，交叉极化电平低于-18 dB。
A novel design technique for broadband substrate integrated waveguide cavity-backed slot antenna is demonstrated in this letter. Instead of using a conventional narrow rectangular slot, a bow-tie-shaped slot is implemented to get broader bandwidth performance. The modification of the slot shape helps to induce strong loading effect in the cavity and generates two closely spaced hybrid modes that help to get a broadband response. The slot antenna incorporates thin cavity backing (height < 0.03 lambda(0)) in a single substrate and thus retains low-profile planar configuration while showing unidirectional radiation characteristics with moderate gain. A fabricated prototype is also presented that shows a bandwidth of 1.03 GHz (9.4%), a gain of 3.7 dBi over the bandwidth, 15 dB front-to-back ratio, and cross-polarization level below -18 dB.