Two‐arm Archimedean spiral antenna fed by broadband double sided parallel strip line

Abstract

This paper is intended to introduce a two‐arm Archimedean spiral antenna fed by a novel feed structure based on DSPSL (Double Sided Parallel Strip Line). A DSPSL provides an ease perpendicular matching network and an impedance transition between input impedance of a spiral antenna and system's impedance of 50 Ω in broadband frequency range. Measured and simulated VSWR and radiation pattern results show a good performance over ultra‐wide band from 2 to 20 GHz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1879–1883, 2016

Design of high return loss logarithmic spiral antenna

“…On the other hand, in the presented designs in references 11 and Ref. [12] the return loss do not exceed 15 dB in a similar operating frequency range. A way of analyzing the impedance of two parallel lines is developed in reference 16 where it is proposed the existence of a perfect electric wall (PEW) between both lines, separated a distance h 1 and h 2 from each one.…”

“…[6][7][8] These designs have a return loss of about 10 dB, and only over a limited bandwidth. Another variant, such as microstrip line to parallel stripline, allows to increase the spectral range of work, [9][10][11][12] but does not establish a specific criterion to determine the impedance at the balanced end, and do not consider the effect of having a finite ground plane, instead of an infinite one at the unbalanced side.…”

Fully planar frequency independent square Archimedean spiral antenna with impedance transformer for ground penetrating radars

“…The ordinary feeding structure for planar spiral antennas is located in the middle of the spiral and expanded into the third dimension. 3,4,[6][7][8][9][10] The vertical impedance transformer (balun) always has an essentially long length and contributes to the high profile antenna and causes problems in the assembly of the antenna. 11 Additionally, it makes the antenna structure nonplanar, complex, and large size, 12 conflicting with the requirements of the low-profile geometry which makes the entire antenna voluminous.…”

“…Because of the balanced configuration of the Archimedean spiral antennas, feeding the antenna from a coaxial line might involve a broadband balun that is one of the major challenges in the design of the Archimedean spiral antenna. The ordinary feeding structure for planar spiral antennas is located in the middle of the spiral and expanded into the third dimension 3,4,6‐10 . The vertical impedance transformer (balun) always has an essentially long length and contributes to the high profile antenna and causes problems in the assembly of the antenna 11 .…”

Simple design of broadband circularly polarized two‐arm Archimedean spiral antenna

“…Due to its balanced structure, feeding the antenna from a coaxial line would require a broadband balun, which is one of the main challenges in spiral antenna design. The conventional method is to use vertical balun situated in the center of the spiral . This kind of feeding method leads to the high‐profile antenna and it also causes difficulties in antenna assembly.…”