Lü Shanwei1, Wu Dongmei1, Wang Wei2, Nan Rendong3*
1. School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. The Second Academy, China Areo-space Science & Industry Corp., Beijing 100854, China;
3. The National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China
In order to increase the field of view (FOV) of the radio telescope, a new grid method named the conforming grid was proposed when the FOV of the telescope was analyzed. With this grid, the physics optical (PO) method is more accurate and fewer grids are needed compared to the conventional PO method. With the modified method, the focal field of WSRT telescope was computed. Based on the result, the dense focal plane array was designed for the telescope. The weights of focal plane array were given by the conjugate field method and the far fields of WSRT were computed. It is proven that a wider FOV, higher gain and aberration correction are obtained by dense focal plane array compared to the single feed.