A near-isotropic circulary polarized antenna for space vehicles

Galindo, V.; Green, K.

doi:10.1109/tap.1965.1138572

Cited by 49 publications

(15 citation statements)

References 4 publications

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“…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.…”

Section: Anten Yapisi Ve Tasarimiunclassified

“…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.…”

Section: Introductionunclassified

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

Turkmen

Seçmen

2015

2015 23nd Signal Processing and Communications Applications Conference (SIU)

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Özetçe-Bu çalışmada yanca ekseninde yönsüz ve dairesel kutuplanmaya sahip bir Ku-bant antenden bahsedilmektedir. Anten yapısı dairesel dalga kılavuzu üzerine açılmış iki eğimli yarık dizisinden oluşmaktadır ve dairesel dalga kılavuzu uyumlu devre ile sonlandırılmıştır. Anten yapısı dikdörtgen bir dalga kılavuzuyla beslenmektedir ve dikdörtgenden dairesel dalga kılavuzuna bir geçiş vardır. Tasarlanan antenin 10 dB geri dönüş kaybı bandı yaklaşık yüzde 3 civarı olup bu bant genişliği Ku-bant uydu haberleşmesi için uygun bir bant genişliğidir. Bandın büyük bir bölümünde eksensel oran dairesel kutuplanmayı sağlayacak şekilde düşüktür. Antenin yanca eksenindeki ışıma örüntüsü oldukça düzgün olup bu eksende tasarlanan antenin yönsüz karakteristiğe sahip olduğu söylenebilir. Anahtar Kelimeler -dairesel dalga kılavuzu; dairesel kutuplanma; uydu haberleşmesi; yarık anten.Abstract-This study describes about a Ku-band antenna with almost circular polarization in omnidirectional azimuth direction. The antenna structure contains two sections of inclined slotted array on a circular waveguide, and the waveguide is terminated with a matched load. The structure is fed a rectangular waveguide and a rectangular-to-circular waveguide transition. The designed antenna has 10 dB return loss bandwidth is about 3 percent, which is usually sufficient for the most of the satellite communication applications in Ku-band. Besides, the axial ratio of the antenna is also sufficiently low within the most of the frequency band as providing circular polarization. Besides, the radiation pattern of the antenna at azimuth plane is uniform such that the designed antenna is said to have the omnidirectional characteristics at this plane.

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Section: Anten Yapisi Ve Tasarimiunclassified

Section: Introductionunclassified

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

Turkmen

Seçmen

2015

2015 23nd Signal Processing and Communications Applications Conference (SIU)

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“…Most omnidirectional antennas are linearly polarized or dual linearly polarized [3,[15][16][17][18], of which many configurations require ground plane [9][10][11][12][13][14][15][16][17][18][19][20][21]. Similarly CP omnidirectional antennas are of two categories, one which require ground plane (slot type or monopole type) [2,5,[22][23][24][25] and other which do not require ground plane (frequency independent antennas, Quadrifilar Helix Antenna (QHA) and orthogonally oriented vee dipoles) [26][27][28][29]. CP antennas which do not require ground plane are attractive for application where proper ground plane is not available, or ground plane is not suitable for use, such as high speed aerodynamic surfaces, Unmanned Aerial Vehicles (UAVs), mini UAVs made of composite material, and small handheld devices which cannot provide ground plane for monopole operation or devices made of non-metallic material [6].…”

Section: Introductionmentioning

confidence: 99%

Design of Circularly Polarized Omnidirectional Bifilar Helix Antennas With Optimum Wide Axial Ratio Beamwidth

Yousaf¹,

Amin²,

Iqbal³

2013

PIER C

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Abstract-In this paper, design and analysis of omnidirectional single feed circularly polarized, wide axial ratio beamwidth resonant side-fed bifilar helix antennas that do not require a ground plane is presented. The simulation and measurement results show that side-fed helix antennas of various radii gives near perfect circular polarization (CP) almost over the whole sphere except at and around nulls, at a certain turn angle by properly proportioning the area of loop (A) with the product of pitch (ρ) and radianlength (l ) of helix. Helix antennas with smaller radii give axial ratio (AR) close to one at higher values of turn angle with lower value of resonant input impedances but CP is less sensitive to inaccuracy in turn angle. However helix antennas with larger radii results in AR close to one at lower values of turn angle and provides better values of input resistance but its AR is more sensitive to variations in turn angle. The simulated results show that the polarization solid angle beamwidth (for AR ≤ 3 dB) varies from 3.96π to 4π steradian. The gain and 3 dB beamwidth of the antennas are 2 dBi and 90 • respectively. The polarization bandwidth varies from 34% to 65%. The simulated results are verified by experimental measurements.

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“…Sleeve dipole with parasitic elements [1], conformal slotpair arrays fed with TM 01 mode [2], or cross slots fed with two TE 11 modes [3] on circular waveguide have been used to obtain circularly polarized omni-directional antennas. In the presented work, circular polarization is achieved with a conformal single slot element on a circular waveguide, radiating into a parallel plate region.…”

Section: Introductionmentioning

confidence: 99%

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

Top

Dogan

2012

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation

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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.

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A near-isotropic circulary polarized antenna for space vehicles

Cited by 49 publications

References 4 publications

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

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

Design of Circularly Polarized Omnidirectional Bifilar Helix Antennas With Optimum Wide Axial Ratio Beamwidth

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

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