Wideband pyramidal sinuous antenna for reflector antenna applications

Rapid design and modelling of wideband sinuous antenna reflector feeds through blended rational interpolation

“…14 By extension, rational functions may also be well suited to interpolate variations over geometrical parameters of antenna structures since, numerically, they can capture steep variations in the response, and physically, antenna geometry variations often relate to frequency variations through the electrical size variations of the structure (eg, the length of a thin wire dipole). Figure 1 shows the geometry of the specific sinuous antenna considered here, which was previously presented in other studies, 6,8,15 and repeated here for clarity. The geometry is parametrised with the angles , , and , the growth rate = d n ∕d n + 1 , as well as the height above the ground plane h. The operating bandwidth of the antenna is controlled by the truncations at d 1 = h ∕8( + ) and d N = 1.2 l ∕4( + ) , where N is the total number of log-periodic cells, and h and l indicate the wavelength corresponding to the maximum and the minimum operating frequencies respectively.…”

“…Figure shows the geometry of the specific sinuous antenna considered here, which was previously presented in other studies, and repeated here for clarity. The geometry is parametrised with the angles θ , α , and δ , the growth rate τ = d n / d n + 1 , as well as the height above the ground plane h .…”

“…The ground plane size is selected equal to the maximum projected diameter of the antenna, and the dual polarisation simulation edge port detail is shown in Figure . During the design phase a differential edge port is preferred for the simulations to simplify the geometry, and details on the design of a balanced wire feed can be found in Steenkamp et al, where comparisons between simulations and measurements are also provided.…”

“…In previous work, the antenna was designed by evaluating a relatively coarse grid of frequencies and design parameters, and simply selecting the best available version from this limited set. The reason is due to the prohibitively slow simulation times required for wide band versions of this antenna—in the order of several hours for 3:1 bandwidth, and several days for 6:1 bandwidth on a typical workstation.…”

Review on Ultra-Wideband Phased Array Antennas

“…But it demonstrates dual circular / dual linear polarization characteristics along with self-complementary, frequency independent nature. The features of sinuous makes a great option for UWB applications such as radars, electronic warfare and high sensitivity requirement at square kilometer array radio telescopes [50][51][52][53]. But in case of radio astronomy applications, instead of cavity backing structure, sinuous array antennas are arranged on a cones surface at 45°.…”