Novel sequential rotation technique for broadband circularly polarized microstrip ring antennas

2008 ◽  
Author(s):  
Kin-Fai Tong ◽  
Jie Du ◽  
Jingjing Huang
Keyword(s):  
Circularly Polarized ◽  
Rotation Technique ◽  
Microstrip Ring

Single-feed circularly polarized microstrip ring antenna and arrays

2000 ◽  
Vol 48 (7) ◽  
pp. 1040-1047 ◽  
Author(s):  
R.R. Ramirez ◽  
F. De Flaviis ◽  
N.G. Alexopoules
Keyword(s):  
Circularly Polarized ◽  
Ring Antenna ◽  
Microstrip Ring

scholarly journals Single-Layer Circularly Polarized Wide Band Reflectarray Antenna with High Aperture Efficiency

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Xinyu Da ◽  
Jialiang Wu ◽  
Jing Zhao ◽  
Lin Baoqin ◽  
Kai Wu
Keyword(s):  
Phase Response Curve ◽  
Low Cost ◽  
Single Layer ◽  
Wide Band ◽  
Center Frequency ◽  
Angular Rotation ◽  
Circularly Polarized ◽  
Aperture Efficiency ◽  
Rotation Technique ◽  
Good Agreement

A circularly polarized broadband low-cost reflectarray in Ku-band is presented using a novel single-layer subwavelength phase-shifting element. The proposed subwavelength element consists of the concentric split ring and the crossed bowtie. The linear reflected phase response curve with 360° phase coverage is obtained. For experimental verification, an array of 25 × 25 reflectarray prototype has been designed and manufactured by employing the angular rotation technique. The measurements are in good agreement with the simulations. The measured gain at the center frequency of 12.5 GHz is 26.6 dBi, corresponding to the aperture efficiency of 52.5%, and the 1 dB gain bandwidth is 26.4%.

scholarly journals Triple-Band Dual-Sense Circularly Polarized Hybrid Dielectric Resonator Antenna

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3899 ◽  
Author(s):  
Amir Altaf ◽  
Munkyo Seo
Keyword(s):  
Circular Polarization ◽  
Dielectric Resonator ◽  
Microstrip Line ◽  
Axial Ratio ◽  
Dielectric Resonator Antenna ◽  
Circularly Polarized ◽  
Left Handed ◽  
Measurement Results ◽  
Microstrip Ring ◽  
Triple Band

In this paper, a triple-band dual-sense circularly polarized (CP) hybrid dielectric resonator antenna is proposed. A modified hexagonal dielectric resonator (DR) is top-loaded with a square microstrip ring (SMR). A vertical-tapered-strip connected to a 50- Ω microstrip line is used to excite the proposed antenna. It is found that the lower and central CP bands correspond to left-handed circular polarization and are produced by the TM 11 and TE 111 modes of the SMR and modified hexagonal DR, respectively. The upper CP band is formed by the combination of the quasi-TM 21 mode of the SMR and quasi-TE 111 mode of the DR that exhibits right-handed circular polarization. The measurement results of the fabricated prototype show triple-band response for |S 11 | < −10 dB with impedance bandwidths (IBWs) of 17.4% (1.75–2.03 GHz), 28.13% (2.23–2.96 GHz), and 2.97% (3.65–3.76 GHz) in the lower, central, and upper bands, respectively. The measured 3 dB axial ratio bandwidths lying within −10 dB IBWs are 3.69% (1.86–1.93 GHz), 5.46% (2.67–2.82 GHz), and 2.15% (3.68–3.76 GHz) along with the peak gains of 5 dBic, 5.28 dBic, and 2.36 dBic in the lower, central, and upper bands, respectively.

scholarly journals A Broadband Single-Feed Circularly Polarized Patch Antenna with Wide Beamwidth

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Changhong Zhang ◽  
Junping Geng ◽  
Bin Zhou ◽  
Xianling Liang ◽  
Ronghong Jin
Keyword(s):  
Reflection Coefficient ◽  
Patch Antenna ◽  
Ground Plane ◽  
Side Wall ◽  
Axial Ratio ◽  
Resistive Load ◽  
Circularly Polarized ◽  
Measurement Results ◽  
Microstrip Ring ◽  
Matching Load

A broadband single-feed circularly polarized patch antenna with wide beamwidth is presented. The patch is coupled to four asymmetric cross slots via a microstrip ring with eight matching segments underneath the ground plane, traversing through the arms of the cross slots in a serial manner. And a coupling slice instead of a resistive load is used as matching load of the microstrip ring for higher gain. Furthermore, a metal side wall surrounding the antenna is used to improve the isolation between adjacent elements in an array. Through optimizing the four asymmetric cross slots and eight matching segments, excellent performances are achieved by the proposed antenna, especially for the broadband and wide beamwidth. Measurement results show that the antenna has −10 dB reflection coefficient bandwidth of 29.7%, 3-dB axial-ratio bandwidth of 21.6%, and beamwidth of more than 90°. It can be considered as a good candidate for the element of arrays.

scholarly journals Design of Ku- and Ka-Band Flat Dual Circular Polarized Reflectarrays by Combining Variable Rotation Technique and Element Size Variation

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 985 ◽  
Author(s):  
Rafael Florencio ◽  
Daniel Martinez-de-Rioja ◽  
Eduardo Martinez-de-Rioja ◽  
Jose A. Encinar ◽  
Rafael R. Boix ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Size Variation ◽  
Dual Band ◽  
Split Ring ◽  
Ka Band ◽  
Circularly Polarized ◽  
Cpu Time ◽  
Element Size ◽  
Rotation Technique ◽  
Focused Beams

In this work circularly polarized flat reflectarray antennas are designed to work at downlink frequencies in Ku- and Ka-band. The design approach for circular polarization radiation combines both the variable rotation technique (VRT) and the element size variation technique (ESVT). The reflectarray element employed consists of a rotable split ring operating at 12 GHz (Ku-band) that surrounds two orthogonal sets of parallel dipoles of variable size operating at 20 GHz (Ka-band). Rotations of split rings and different sizes of dipoles are exploited as degrees of freedom by VRT and ESVT for designing focused beams dual band dual circular polarized reflectarrays. The split ring can be used to achieve single focused beams for circular polarization by VRT at 12 GHz, and the set of orthogonal dipoles can be used to achieve two focused beams for dual circular polarization by ESVT at 20 GHz. In this way, the reflectarray element has been used to design two flat dual band circularly polarized reflectarrays that generate three pencil beams either in the same direction or in different directions: one pencil beam with right-hand circular polarization (RHCP) at 12 GHz and two pencil beams with both RHCP and left-hand circular polarization (LHCP) at 20 GHz. The designed reflectarrays are carried out under local periodicity assumption by means of in-house electromagnetic software that applies the Method of Moments in the Spectral Domain. Validations of the in-house electromagnetic software show significant CPU time savings with respect to CPU time consumption provided by commercial software of general purpose as CST electromagnetics software. Numerical results of radiation patterns produced by the designed reflectarrays show efficiencies around 65% and a bandwidth of 6% for a main beam cross-polarization discrimination of 25 dB. The numerical results are satisfactorily validated by CST software and a tolerance errors study has been numerically carried out with acceptable results.

Sign in / Sign up

Export Citation Format

Share Document