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A Slot-array Antenna on a Coaxial Cylinder with a Circularly Polarized Conical Beam by Kyouichi Iigusa; Tasuku Teshirogi; Masaharu Fujita; Shin-ichi Yamamoto; Tetsushi Ikegami is a Engineering article available to read on EtoBox.

What is A Slot-array Antenna on a Coaxial Cylinder with a Circularly Polarized Conical Beam about?

As a vehicle-mounted antenna to be used for satellite communication and broadcasting without the need for capture and tracking, a circularly polarized conical beam with a tilt angle of 45° and a beamwidth of 18° is realized with a slot-array antenna on a coaxial cylinder. In the direction normal to the array axis, a circular polarization can in general be realized by using a pair of slots inclined by r45°s paced by O g / 4 (where O g is the effective guide wavelength including the effects of the slots cut on the external conductor) as a unit element. Since the projections of the horizontal and vertical components of the slot are not equal in the tilt direction, the axial ratio is degraded. Hence, a theoretical and experimental investigation is carried out for a method for improving the axial ratio by adjustment of the spacing of the slots comprising the pair and of the leaning angle of the slot. On amplitude and phase of the aperture distribution, they can be adjusted by the size and location of the slots. By shifting the slot, the optical path length in the tilt direction varies so that the antenna pattern and the axial ratio can be degraded. The correction of the slot shift is co

Who reads A Slot-array Antenna on a Coaxial Cylinder with a Circularly Polarized Conical Beam?

Author

Kyouichi Iigusa; Tasuku Teshirogi; Masaharu Fujita; Shin-ichi Yamamoto; Tetsushi Ikegami

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 8756-6621)

Published

2000

Language

EN

Field

Engineering (Physical Sciences)