1. Article A Novel Leaky-Wave Antenna Combining an Image NRD Guide and ...
2. https://ieeexplore.ieee.org/document/8379134/
3.Article Truncated Leaky-Wave Antenna With Cosecant-Squared Radiation Pattern
4. https://ieeexplore.ieee.org/document/8058584/
In addition to these, Please go for referred journal publications, where u can find sufficient information. Number of open access referred journal publication websites are there. U can try those..