An ultra-wide band printed small aperture tapered slot phased array antenna covering 6-18GHZ

Abstract

For phased array applications covering ultra wide bandwidth, it is necessary to restrict the size of the aperture to less than λ/2 at highest frequency of operation. For 6-18 GHz coverage, an aperture size of less than 9.76mm is required for scanning to ±450 without appearance of grating lobes and occurrence of element pattern nulls over the band. Meeting this requirement a printed tapered slot antenna has been designed with the above aperture size. Detailed parametric studies have been carried out over 6-18 GHz and dimensions have been opti-mized for return loss. The design has been carried out with HFSS software. A return loss of less than -7.5dB across 5.6 -20 GHz has been obtained for a single antenna. Also satisfactory radiation patterns have been obtained.

Five Element Printed Modified Vivaldi Array Covering 5.3 to 20 GHz

“…Modifications with respect to the earlier reported papers are the inclusion of two circular cavities & an open circuited rectangular stub. Also the exponential taper characteristic of the conventional Vivaldi antenna has been modified with super imposition of a sinusoidal profile on exponential taper reported in our earlier paper [16]. This antenna has been taken as a reference antenna and it is used for designing a five element array.…”

“…In this present paper, the reference antenna taken is a single element having an aperture size of 9.5mm over 5.6-20 GHz frequency range reported in our earlier paper [16]. The same reference antenna when placed in an array invariably has high VSWR between 5.6GHz to 8GHz and requires careful adjustment of various parameters.…”

A PARAMETRIC ANALYSIS & DESIGN OF ALL METAL VIVALDI ANTENNA COVERING 3.0-18 GHZ FOR DF AND PHASED ARRAY APPLICATIONS

“…Log periodic antennas, Archimedean spirals, Log spirals, Ridged horns covering 2-18 GHz have been used in several applications [2][3][4]. DF systems cover 1-18 GHz usually in four bands namely 1-2 GHz, 3-4 GHz, [4][5][6][7][8][8][9][10][11][12][13][14][15][16][17][18] GHz. This can also be realized in a single band or in two bands.…”

“…An antipodal Vivaldi antenna with elliptical patch with a parasitic element and an aperture size of 66 mm covering 6-21 GHz is available in literature [8]. An ultra-wideband small aperture tapered slot phased array antenna operating over 5.6-20 GHz with a VSWR of less than 2.5 can also be seen in literature [9]. A compact antipodal Vivaldi antenna with rectangular slots with shaping of flare design over 6-18 GHz is also reported in the literature [10].…”

“…Comparison of return loss with and without walls.From the plot it is observed that -For Red color plot representing the antenna design with side and back walls, the Return loss is below −7.5 dB over 5 [3][4][5][6][7][8][9][10][11][12][13][14][15][16]…”