Компактная квадрифилярная антенна S-диапазона

Abstract

In this article a compact printed quadrifillar helix antenna (QHA) is introduced. It is designed for S-band operation as a part of a narrowband telecommunication radio channel for small-scale satellites. The antenna is of resonant type. The length of its open-ended helix elements corresponds to the second order resonance. Compared to the first-order resonance QHA, this antenna has cleaner circular polarization ( within range ±68°) and a wider radiation pattern () at the cost of increased height. The height of the antenna is reduced by dielectric loading and meandering of antenna helix elements. It is 30% lower than height of the conventional QHA. Size reduction leads to decreasing relative bandwidth down to 1 % and dropping input impedance down to 10..12 Ohms. To match a conventional 50 Ohm coaxial line and provide proper phase and amplitude relations, a compact feed network is designed. It consists of two-port impedance-transforming Wilkinson power splitters combined in a two-stage structure. First stage splitter scales output impedance down to 25 Ohms, second stage - down to 12.5 Ohms thus providing nearly ideal match to the proposed antenna input impedance. Microstrip delay lines are used to adjust phases of the output signals. Insertion loss of the proposed network is -1 dB higher than for ideal network (6 dB), while phase error is less than within antenna operation range.

• quadrifillar helix antenna
• Wilkinson splitter
• circular polarization

For citation

References

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