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Introduction Configuration of Array Antenna

39 λ, where λ is wavelength of used Tanaka et al, . Moreover, the size of ground g1 = . mm and g2 = . mm Table . Technical specification of CP‐SAR antenna on‐board UAV No Antenna Parameters Specification for UAV . Resonance Frequency Center Gz , . Pulse Band Wide Mz , . Axial Ratio dB  . Antenna Efficiency dBic 8 . Gain Antenna degree , . Azimuth Beamwidth degree  , . Elevation Beamwidth degree , – , 8. Antenna Size m , x , . Polarization TxRx RCP + LCP

3. Results

3.1 Single Antenna n Figure . to Figure ., the images show the simulation results of antenna gain of LCP, RCP and the total gain of a single antenna with a truncated equilateral triangle proximity fed. Gain total shows the stability of the gain because of an accumulation of LCP and RCP gain with a value of dBi which is relatively better than the LCP and RCP gain at target frequency of . Gz. A single antenna with a reduction in length‐ patch truncated makes the total vector current distribution is reduced in the truncated area which caused wide‐band antenna becomes narrow Edy PUR et al, . Figure . LCP gain ‐ ‐ 0 ‐ ‐ 0 ‐4 ‐40 ‐3 ‐30 ‐2 ‐20 ‐1 ‐10 ‐ 10 0.3 0. 0.9 1.2 1. 1.8 2.1 2.4 2.7 3 3.3 Ga in [d Bi ] Fre [GHz] LH Circular Field Gain 39 Figure . RCP gain Figure . total gain Figure . shows the value of axial ratio Ar for simulation at the target frequency of . Gz at . dB. n addition, Ar‐ dB bandwidth of the antenna closer to the maximum of . Figure . shows the relationship between the S‐parameters and frequencies for simulation of antenna TxRx. n this figure, it can be seen that the S‐parameters of an equilateral triangle truncated antenna at the target frequency of . Gz approximately ‐ . dB. n the Figure 8. describes the characteristics of the input impedance of the TxRx. This figure shows that the real part of the simulation has the result of close to Ω. While the reactance of the equilateral triangle truncated antenna also close to Ω. Furthermore, the impedance bandwidth below ‐ dB of the antenna is about Mz. ‐ ‐ 0 ‐ ‐ 0 ‐4 ‐40 ‐3 ‐30 ‐2 ‐20 ‐1 ‐10 ‐ 0.3 0. 0.9 1.2 1. 1.8 2.1 2.4 2.7 3 3.3 Gain [dBi] Fre [GHz] RH Circular Field Gain ‐ 0 ‐ ‐ 0 ‐4 ‐40 ‐3 ‐30 ‐2 ‐20 ‐1 ‐10 ‐ 10 0.3 0. 0.9 1.2 1. 1.8 2.1 2.4 2.7 3 3.3 Gain [dBi ] Fre [GHz] Total Field Gain 397 Figure . axial ratio Figure .s‐parameter 0.2 0.4 0. 0.8 1 0. 1 1. 2 2. 3 3. [dB] Fre [GHz] A ial Ratio ‐1.00E+02 ‐9.00E+01 ‐8.00E+01 ‐7.00E+01 ‐ .00E+01 ‐ .00E+01 ‐4.00E+01 ‐3.00E+01 ‐2.00E+01 ‐1.00E+01 0.00E+00 1.00E+01 2.00E+01 3.00E+01 4.00E+01 0.3 0. 0.9 1.2 1. 1.8 2.1 2.4 2.7 3 3.3 Value Fre [GHz] S‐Para eters dB[S 1,1 ] in dB Ang[S 1,1 ] in degree

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