Millimetre‐wave high‐gain circularly polarised SIW end‐fire bow‐tie antenna by utilising semi‐planar helix unit cell

Abstract

In this work, a high-gain circularly polarised (CP) substrate integrated waveguide (SIW) bow-tie antenna is presented. The proposed antenna includes a pair of bow-tie radiators. To centralisation radiated pattern and recede side lobe and back lobe level two tilted rows of metalised via hole at the end of the SIW feed line is used. The methods of increasing the antenna gain and generating the CP are discussed. The proposed antenna was fabricated to validate simulated results. The designed structure operates across 40-68 GHz and exhibits a gain of 10-12.5 dBic. In addition, the proposed antenna exhibits a 3-dB axial ratio bandwidth from 54 to 64.3 GHz.

Planar Endfire Circularly Polarized Quasi-Yagi Antenna With Enhanced Bandwidth and Reduced Size for Wideband Wireless Applications

“…Compared with the antennas presented in [6,7] and [8], the proposed antenna obtains a much wider effective CP bandwidth and higher gain, without sacrificing the antenna profile performance significantly. Meanwhile, though the antennas presented in [9] and [10] have an inherent advantage on the proposed antenna in effective CP bandwidth, their antenna profiles are much higher than that of the proposed antenna due to their helix structures. Consequently, from Table 1, it could be seen that the proposed antenna provides either a wider effective CP bandwidth or a lower profile.…”

“…Planar circularly polarized (CP) antennas have attracted great attention due to their merits of simple structure, low profile, light weight, low fabrication cost, low loss, capabilities of reducing polarization mismatch, suppressing multipath interferences, and suitability for integration with microwave circuits. Compared with the conventional planar microstrip CP antennas with the main beams at broadside, planar endfire CP quasi-Yagi antennas can provide endfire CP beams in parallel with the antenna plane and broader bandwidth due to their inherent quasi-Yagi structures [1][2][3][4][5][6][7][8][9][10]. On the one hand, though the feature of broad 3 dB axial ratio (AR) bandwidth is becoming increasingly necessary due to the high data rate required by modern services, many newly published planar endfire CP antennas in [6][7][8] only support narrow-band applications.…”

“…However, their gains of 2.6 dBc, 2.3 dBc and 1.5 dBc as well as their effective CP bandwidths are limited. On the other hand, the planar helical antennas in [9] and [10] have relatively higher profiles due to their helical structures. In [9], a planar helical antenna with straight-edge connections implemented by plated via-holes is presented.…”

“…The antenna has a wide effective CP bandwidth of 34% with a large size of 1.22λ 0 × 1.25λ 0 , and its profile is 0.11λ 0 . In [10], a millimeter-wave CP SIW endfire bow-tie antenna utilizing semi-planar helix unit cell is proposed. It has an effective CP bandwidth of 17.4% and a profile of 0.1λ 0 .…”

Compact wideband tapered‐fed printed bow‐tie antenna with rectangular edge extension

“…According to the needs of these specific applications, performances of PBAs have been tried to be improved. There are many useful methodologies such as implementations of metamaterials, feeding line modifications, employment of slots, different ground plane variations, matching stubs and lumped elements, fractal and array structures, parasitic directors, reflectors and additional bow extensions are suggested in order to improve the performances of PBA in terms of radiation pattern, gain, and bandwidth. However, relatively smaller structures have comparably narrower bandwidths while the ones with relatively wider bandwidth have larger dimensions .…”