Tilt Beam Characteristic by Changing Length of Finite-Sized Square Dielectric Substrate of One Arm Rectangular Spiral Antenna
نویسندگان
چکیده
Abstract: Tilt beam characteristic by changing the length of finite-sized square dielectric substrate of one arm rectangular spiral antenna has been investigated. Rectangular spiral is printed on a finite sized dielectric substrate (εr=3.27) backed by a finite-sized conducting plane. Rectangular spiral radiates in Right Handed Circular Polarization (RHCP). Horizontal spiral arm length (HL) is varied from HL=0.8λo to HL=5.2λo to choose the length that yields the proper axial ratio and gain. HL is chosen to be three values: HL1=1.16λo, HL2=2.63λo and HL3=4.64λo. HL1 radiates axial beam whereas HL2 and HL3 radiates tilt beams. By changing square dielectric substrate length (SL), maximum beam direction on the elevation angle has been tilted more to the higher elevation angle with HL2 and HL3 fixed. Half Power Beam Width (HPBW) in the elevation angle when Φ = maximum gain direction of RHCP is decreased by increasing square dielectric ubstrate length. s
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Tilted- and Axial-Beam Formation by a Single-Arm Rectangular Spiral Antenna With Compact Dielectric Substrate and Conducting Plane
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