A New Approach to Synthesis of a Quasi Non-Uniform Leaky Wave Antenna

kground and Objectives: In this paper, a closed-form mathematical formula has been presented using of the proposed periodic structure E-field distribution, that helps designers to calculate the width of the slots in Quasi Non-Uniform Leaky Wave Antenna (QNULWA).Methods: This method is based on two steps. In the first step, some important parameters for the proposed antenna design will be extracted using simulation. In the second step, by solving a discrete differential equation, a general relation will be obtained for these types of antennas. This method has been investigated in the case of slot LWA families. Results: A Leaky wave antenna has been synthesized in the ۱۵.۵- ۱۸ GHz frequency range for Gaussian radiation pattern. The results of simulation and antenna design will be very close to each other in ۲.۵ GHz Bandwidth (۱۵.۵ - ۱۸ GHz), which shows the accuracy of this formula. Also, By changing the frequency range ۲-۵ GHz, the main lobe direction of the antenna will scan the space approximately ۱۰ degrees(from ۶۳ to ۷۳ degree). The antenna has an SLL value of about -۲۵ dB and ۱۳ dB Gain at whole band ۱۵.۵-۱۸ GHz .Conclusion: The obtained formula helps the antenna designers to calculate the dimensions this type of antenna for any pattern distribution.

Keywords:

Leaky Wave Antenna (LWA) , Quasi Uniform LWA , Quasi Non ULWA , Waveguide Atenna