The thesis investigates the characteristics of Chebyshev beamforming algorithm to suppress the sidelobe level (SLL) on planar antenna arrays. Firstly, a single planar patch antenna has been designed and simulated to generate its radiation pattern data. A group of four of these antennas forms a 2×2 planar antenna array as the fundamental array. The array of N×N elements can be formed from the fundamental array. The array factor of the planar arrays has been calculated. The Chebyshev beamforming algorithm has been applied to this planar antenna array. The software code has been developed. As the results, the beam of this planar array can be formed with reduced sidelobe level to maximum -40 dB and the trade-off value is -20 dB and -25dB for 8×8 and 16×16 planar antenna array, respectively.
Each element of the array is a planar microstrip patch antenna that operates at 20 GHz (Ka-band). The antenna used for simulating has been modeled as shown in Figure 3-2. The model is a square patch antenna which has been placed on planar surface which has radius of 38.2 mm. Its size is 4 mm × 4 mm. The antenna is linearly polarized along the x-axis. The input impedance is 50 Ω at centered frequency. The substrate used in this case is Duroid with the relative permittivity of 2.2.
Software Solution for Applying Chebyshev Pattern in Planar Antenna Array
The interface of software
The software solution has been developed to apply chebyshev algorithm in N×N planar antenna array. This software can form the radiation pattern of 2×2, 4×4, 6×6, 8×8, 12×12 and up to 16×16 elements by choosing the size of antenna array in Array size M×K box. Beside, software can help to reduce the sidelobe level of those antenna arrays under the prescribed value that can be selected in SLL box by applying Chebyshev algorithm. The weight can be transferred to hardware systems by ticking the Save box.
Influence of the Number of Elements of the Planar Antenna Array to the Directivity
Comparison of Radiation pattern between 2×2, 4×4,6×6, 8×8,12×12 and 16×16 planar antenna array
Conclusions
The thesis has successfully investigated the characteristics of famous beamforming algorithm, which is Chebyshev in planar antenna arrays.
When applying Chebyshev pattern to the radiation pattern of 8×8 and 16×16 planar antenna array, the SLL has been reduced significantly from -14 dB up to -40 dB. This is very good in terms of maintaining a high directivity for the antenna array. In the other hand, reduction of SLL influences to the directivity. As the results, the trade-off value of SLL is -20 dB and -25 dB of 8×8 and 16×16 antenna array, respectively.
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