Abstract
In this article, an array optimization method for maximizing beam collection efficiency (BCE) to an arbitrary receiving plane in the near field is proposed. The proposed method considers each element pattern in an array; thus, optimization with mutual coupling is possible by using active element patterns. Besides, the proposed method can consider the polarization direction of a receiving antenna since the optimization problem is calculated in vector form. The problem of maximization of BCE boils down to the generalized eigenvalue problem, and the best solution can be obtained mathematically. The results obtained via numerical analysis in various calculation models indicate the validity of the proposed method. Optimization is then performed using the active element patterns obtained from electromagnetic simulation. Based on the comparison of the results without considering mutual coupling in the optimization, it is confirmed that the proposed method yields better results, such as lower reflection and antenna losses and higher BCE and transmission efficiency, by using active element patterns.
Highlights
M ICROWAVE power transmission (MPT) can deliver energy to distant electronic devices, including highaltitude airship, wireless sensors, and unmanned aerial vehicles [1], [2], [3]
Optimization with mutual coupling by using active element patterns can be performed in this method
From the results of the EM simulation, we have found that the beam collection efficiency (BCE) optimization using the active element patterns decreases the antenna and reflection losses and increases the BCE
Summary
M ICROWAVE power transmission (MPT) can deliver energy to distant electronic devices, including highaltitude airship, wireless sensors, and unmanned aerial vehicles [1], [2], [3]. Studies on the optimization method in the near field are scarce, even though transmission in the near field is required for obtaining high BCE This is probably because the near field radiation pattern on a Rx plane can be. KOJIMA et al.: ARRAY OPTIMIZATION FOR MAXIMUM BEAM COLLECTION EFFICIENCY TO ARBITRARY RECEIVING PLANE IN NEAR FIELD approximated to the far field pattern when giving a quadratic phase taper to an array weight obtained through optimization in the far field [12]. The method that uses S parameters between the transmitting and receiving antenna ports was introduced in [13] as an optimization method in the near field This method can be employed even when obstacles are in the propagation region. An optimization method for maximizing BCE to an arbitrary Rx plane in the near field is proposed.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
