Nonreciprocal Leaky-Wave Antenna Based on Coupled Microstrip Lines on a Non-Uniformly Biased Ferrite Substrate
Nonreciprocal Leaky-Wave Antenna Based on Coupled Microstrip Lines on a Non-Uniformly Biased Ferrite Substrate
复制标题
非均匀偏置铁氧体基板上基于耦合微带线的非互易漏波天线
DOI：
10.1109/tap.2013.2257646
复制
发表时间：
2013
影响因子：
5.7
通讯作者：
J. Volakis
中科院分区：
文献类型：
--
作者：
N. Apaydin;K. Sertel;J. Volakis
先前的工作证明，不可逆慢波可以在印刷在磁性基板上的一对耦合传输线上进行引导。这是通过设计晶胞几何形状以在色散 (K-ω) 图中表现出带边缘 ($K = pi$) 频率附近的光谱不对称性来实现的。在这项工作中，采用相同的概念，通过在 K-ω 图的快波区域 (|β| <; k0) 中操作耦合线来实现不可逆辐射。为了验证不可逆辐射，构建了 8 单元漏波天线 (LWA)，并在存在非均匀外部磁场的情况下进行了测试。具体来说，在 E 平面中测量的发射和接收增益之间观察到 5 dB 的对比度。重要的是，一旦考虑到磁场的不均匀性，测量和模拟之间就会观察到良好的一致性。我们注意到可以改变外部磁场来实现光束扫描。这与通过频率控制实现波束扫描的传统 LWA 不同。
Previous work demonstrated that nonreciprocal slow waves can be guided on a pair of coupled transmission lines printed on a magnetic substrate. This was done by designing the unit-cell geometry to exhibit spectral asymmetry near the band edge ($K = pi$) frequency in its dispersion (K-ω) diagram. In this effort, the same concept is adapted to attain nonreciprocal radiation by operating the coupled lines in the fast wave region (|β| <; k0) of the K-ω diagram. To validate the nonreciprocal radiation, an 8-unit-cell leaky-wave antenna (LWA) was constructed and tested in presence of a non-uniform external magnetic field. Specifically, 5 dB contrast was observed between the measured transmit and receive gain in the E-plane. Importantly, good agreement was observed between measurements and simulations once non-uniformities in the magnetic field were taken into account. We note that the external magnetic field can be changed to achieve beam scanning. This is unlike traditional LWAs that achieve beamscanning via frequency control.
影响因子：
5.7
作者：
A. Parsa;T. Kodera;C. Caloz
通讯作者：
A. Parsa;T. Kodera;C. Caloz