Broadband Antenna Study

Design and Analysis of Bifurcated Twin Dielectric Slab Loaded Rectangular Waveguide. Dual Frequency Array Elements

“…Consequently, the use of a bidirectional exciter requires load terminations at the back of the guide to ensure the proper aperture field phase at both frequencies, and results in a 3 dB power loss. This difficulty is alleviated by a unique unidirectional exciter consisting of three stripline fed flared (2,3,4) -B'*the low frequency lattice is y y ) as shown in Figure 4a, and the high frequency lattice is as shown in Figure 4b, When arrayed in a triangular grid, the lattice vectors are defined as in Figure 5, regardless of operating frequency or septum thickness.…”

“…Then, the voltage and current equations, (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21) and , respectively, take the form…”

“…The ripple in the well-matched region of the experimental band may also be largely eliminated by judicious selection of the stub lengths. In the study of isolated notch antennas, (4) it was found that similar ripple in reflection coefficient occurred when the electrical lengths of the stubs were significantly different. Since the spectrum of guided waves in the region of the notch short circuit may be determined in a straight forward manner, the proper stub length ratio is obtainable by either analytical or experimental means.…”