ADMITTANCE CHARACTERISTICS OF OPEN SLOT RADIATOR
S. ARUNA *
Department of Electronics and Communication Engineering, College of Engineering (A), Andhra University, Visakhapatnam, Andhra Pradesh, India.
G. S. N. RAJU
Department of Electronics and Communication Engineering, College of Engineering (A), Andhra University, Visakhapatnam, Andhra Pradesh, India.
P. V. SRIDEVI
Department of Electronics and Communication Engineering, College of Engineering (A), Andhra University, Visakhapatnam, Andhra Pradesh, India.
*Author to whom correspondence should be addressed.
Abstract
This work presents analysis of inclined slot radiator in the narrow wall of standard X-band rectangular waveguide by determining admittance and resonant length. The determination of admittance characteristic is the main focus. The analysis consists of the concept of self-reaction and discontinuity in modal current. Slot width and slot inclination are considered as variables and the results are computed for normalized admittance of the slot as a function of frequency.The analysis involves plane wave spectrum approach. The expression for resonant conductance obtained using the present method which is identical to that obtained by Stevenson [4] if the depth of cut is assumed to be zero for the top and bottom walls. In this present paper, analysis is done for the variation of conductance as a function of slot inclination for fixed depth of cut of 3.5 mm in both top and bottom walls of the standard X-band guide. The results are thus obtained for the variation of conductance, susceptance, coupling and VSWR as a function of frequency for higher slot inclinations. The slots considered in the present work are extremely useful for high power applications.
Keywords: Standard waveguides, depth of cut, Stevenson formula, high power applications, X-band, slot inclinations.