A circularly polarized omni-directional low loss Ka-band slot antenna

Abstract

Design of a Ka-band low loss circularly polarized omni-directional slot array antenna is presented. The slot array is conformal on a circular waveguide and the slots are radiating into a parallel plate region for circular polarization. Elevation beam is directed to +10 degrees for the required elevation coverage of -10°/+30°. Simulation results show that the return loss is better than 20 dB in 1% bandwidth. Gain of the antenna greater than 1 dBi and the axial ratio better than 4.2 dB in the full sector of coverage.I.

Omnidirectional and Circularly Polarized Slotted Antenna Array With Increased Bandwidth Performance by Using Nonidentical Waveguide Slots

“…Adjacent resonant frequencies are selected to be close to each other, which makes the antenna wideband. This technique provides lower gain variation in much wider bandwidth as compared to other similar studies in literature (Masa-Campos et al, 2007a, 2007bTop & Dogan, 2012;Turkmen & Secmen, 2017b), which can be considered as the main novelty of this study.…”

“…Adjacent resonant frequencies are selected to be close to each other, which makes the antenna wideband. This technique provides lower gain variation in much wider bandwidth as compared to other similar studies in literature (Masa‐Campos et al, , ; Top & Dogan, ; Turkmen & Secmen, b), which can be considered as the main novelty of this study. Besides, the proposed structure has mentioned superiorities over the other relevant antennas in terms of complexity, compactness, easy integration with other waveguide components, high power capability, high radiation efficiency, bandwidth, and omnidirectional circular polarization performance.…”

“…Even the initial design with identical slots has wider bandwidth as compared to similar studies (Masa-Campos et al, 2007a, 2007bTop & Dogan, 2012) having at most 1.4% bandwidth; in the study, it is aimed to increase the bandwidth of the proposed antenna. When the return loss result for the initial design given in Figure 4 is examined, it can be deduced that the dimensions of the slots correspond to a single and strong resonant frequency in the response.…”

The design of an omnidirectional and circularly polarized Ku-band antenna for satellite communication

“…Böylece dairesel dalga kılavuzunda ilerleyen dalga, yürüyen dalga (traveling wave) olup yapıdaki anten dizisi rezonans olmayan bir anten dizisi olarak düşünülebilir. Diğer çalışmalarda [2][3][4] benzer dairesel dalga kılavuzlarının en üst kısımları genellikle kısa devre ile sonlandırılmış ve en iyi performansı sağlamak amacıyla kısa devreye en yakın yarık dizisinin kısa devreye uzaklığı λ g,01 /4 olarak ayarlanmıştır. Fakat bu durum antenin geniş frekans bandında çalışmasını kısıtlayan bir etken olup antenin özellikle geri dönüş kaybı performansı açısından dar bantta çalışmasına sebep olmaktadır.…”

“…Literatürde bu amaçla kullanılmak üzere tasarlanmış birtakım antenler ve ilgili çalışmalar [1][2][3][4] bulunmakla beraber bu çalışmalardaki antenlerin genellikle 10 dB geri dönüş kaybına ait frekans bantlarının yüzde 1 gibi dar değerlere sahip olduğu gözlemlenmiştir. Fakat bu bant genişlikleri özellikle geniş bantlı uydu haberleşmeye cevap veremeyebilir.…”