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- W978149381 abstract "In this paper, we investigate and compare two difierent antenna types for UHF SATCOM applications; proposed Moxon (bent dipole) and conventional egg beater (loop) antennas in terms of antenna performance and physical size. Bent dipole and egg beater antennas are simulated using HFSS software. Prototype antenna for Moxon is also fabricated and measured for its return loss using Agilent network analyzer and compared to that of an egg beater antenna. Antenna gains are also simulated. Simulation results show that Moxon antenna has more impedance bandwidth than egg beater antenna with smaller dimensions and hence can be used for broadband SATCOM applications. 1. INTRODUCTION For UHF SATCOM mobile applications, antennas are required to have high-performance including a broadband operation, circular polarization as well as a large angular coverage from horizon to zenith. For airborne systems at these frequencies, wavelength could be on the order of meters and conventional antennas may be too big for deployment. Compact size antennas with desired antenna performance become very crucial part of these airborne systems. In this paper, a novel antenna Moxon type bent dipole is proposed for circular polarization and its performance is compared to a conventional egg beater antenna whose dimensions are larger than the proposed Moxon antenna. For UHF satcom applications, broadband antennas can be employed such as sleeve dipoles (1). However, for mobile applications, the antenna size is critical and obtaining a circular polarization with sleeve dipoles will result in complicated antenna structures. Egg beater antennas are another choice for obtaining circular polarization with loop antennas at UHF frequencies (2). Egg beater antennas may not be easily deployable on mobile platforms due to their dimensions. In this paper, we implement a Moxon antenna (3) (bent dipole over a ground plane) to obtain circular polarization with its compact size compared to conventional eggbeater antenna which comprises two circular loops fed with a quadrature coupler for circular polarization. Rest of the paper is organized as follows: in Section 2, moxon bent dipole antenna and egg beater antenna will be described in details, in Section 3, simulation and experimental results are given and flnally paper is concluded." @default.
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- W978149381 date "2011-12-01" @default.
- W978149381 modified "2023-10-16" @default.
- W978149381 title "UHF SATCOM Broadband CP Antenna: Moxon Type Bent-dipoles over a Ground Plane" @default.
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