Design, Fabrication and Test of Parabolic Cylinder Reflector and Horn for Increasing the Gain of Vlasov Antenna

Abstract

Abstract-This paper proposes two methods for increasing the Gain of Vlasov Antenna. The first method, using a Parabolic Cylinder Reflector, results in a 7 dB increase in the Gain. The second method, constructing a Horn on the aperture, increases the Gain by about 5 dB. The results were checked using a prototype antenna and there was a close agreement.

Wide-band conversion of donut-shaped pattern to directive one by square-shaped pattern director antenna

“…Besides, the shape of the output pattern is strongly dependent on the cutting angle of the waveguide. But it focuses the maximum power in the center of the diagonal section aperture in a too narrow band [9][10][11][12]. This problem is more noticeable in the coaxial-vircator because its frequency is a function of the applied voltage [13,14].…”

A circularly polarized TEM to TE 11 mode converter antenna

“…Another problem is that the polarization of its output field cannot be circular. A coaxial beam-rotating antenna (COBRA) can convert a TM 01 mode to TE 11 mode [17][18][19][20][21]. The major problem of the structure is the use of dielectrics, which increases the losses, especially at high power.…”

TEM‐TE 11 mode converter antenna like a pelican beak

“…The antenna is made of a cut at the end of the open-ended waveguide, diagonally. In the Vlassov antenna, its main-lobe derivate from the bore-sight about 30°, which makes the antenna unusable in some applications [6][7][8][9]. To shoot at a target point, the first thing that comes to mind is to derivate the antenna or the entire system, including the power supply, the pulse shaping system, the electromagnetic diode, and the antenna; but this is impossible in many cases.…”