Left Hand and Right Hand Circularly Polarized Antenna for 5G Devices

2021 ◽  
pp. 119-127
Author(s):  
Tan Minh Cao ◽  
Hong Son Vu ◽  
Thi Duyen Bui ◽  
Minh Thuy Le
Keyword(s):  
Circularly Polarized ◽  
Left Hand ◽  
Right Hand

Right-Hand/Left-Hand Circularly Polarized High-Gain Antennas Using Partially Reflective Surfaces

2014 ◽  
Vol 13 ◽  
pp. 431-434 ◽  
Author(s):  
Avinash R. Vaidya ◽  
Rajiv K. Gupta ◽  
Sanjeev K. Mishra ◽  
Jayanta Mukherjee
Keyword(s):  
High Gain ◽  
Circularly Polarized ◽  
Left Hand ◽  
Right Hand ◽  
Reflective Surfaces

scholarly journals Dual Circularly Polarized Omnidirectional Antenna with Slot Array on Coaxial Cylinder

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Bin Zhou ◽  
Junping Geng ◽  
Zhe Li ◽  
Wenzhi Wang ◽  
Xianling Liang ◽  
...  
Keyword(s):  
Return Loss ◽  
Axial Ratio ◽  
Coaxial Cylinder ◽  
Circularly Polarized ◽  
Left Hand ◽  
Omnidirectional Antenna ◽  
Right Hand ◽  
Two Sides

A dual circularly polarized (CP) omnidirectional antenna based on slot array in coaxial cylinder structure is presented in this paper. It is constructed by perpendicular slot pairs around and along the axis of the coaxial cylinder to realize the omnidirectional CP property, and two ports are assigned in its two sides as left hand circularly polarized (LHCP) port and right hand circularly polarized (RHCP) port, respectively. The proposed antenna achieves a bandwidth of 16.4% ranging from 5.05 to 5.95 GHz with an isolation higher than 15 dB between the two CP ports, and the return loss (RL) is higher than 10 dB within the bandwidth in both of the two ports. From the measured results, the average axial ratio (AR) of the proposed antenna in omnidirectional plane is lower than 1.5 dB.

scholarly journals WAVEGUIDE FEED NETWORK FOR HORN ANTENNA WITH CIRCULAR POLARIZATION

2021 ◽  
Author(s):  
Stepan Piltyay
Keyword(s):  
Circular Polarization ◽  
Electromagnetic Waves ◽  
Metal Structure ◽  
Horn Antenna ◽  
Variable Cross ◽  
Circularly Polarized ◽  
Maximum Gain ◽  
Left Hand ◽  
Right Hand ◽  
Feed Network

The article presents the methodology for designing and optimizing of feed network for a circularly polarized horn antenna. A horn antenna has a metal structure and consists of a waveguide that has a variable cross-section and an open radiating end. Electromagnetic waves in such antenna are excited by a waveguide that is connected to a horn antenna in through the narrow wall. The proposed feed network of the horn antenna consists of a rectangular waveguide with a slot. In order to obtain the excitation of signals with circular polarization at the output, a slot was cut in the waveguide at an angle of 45º. As a result, the network makes it possible to form the signals with right-hand circular polarization and left-hand circular polarization. The presented design of the horn antenna feed network eliminates the need to develop a separate waveguide device of polarization processing. The designed feed network of the circularly polarized horn antenna can be used at an operating frequency of 8.0 GHz. At these frequency the reflection coefficient is less than −19 dB. The proposed horn antenna provides a maximum gain of 21 dB for right-hand circular polarization and a maximum gain of 10 dB for left-hand circular polarization. Cross-polarization isolation is higher than 10 dB. Therefore, the developed feed network of the horn antenna provides narrowband operating mode at the circular polarization with satisfying electromagnetic polarization characteristics and matching at the frequency of 8 GHz. Developed feed network of the horn antenna with circular polarization can be used in radio engineering systems, which carry out polarization processing of signals.

Triple band circularly polarized compact microstrip antenna with defected ground structure for wireless applications

2015 ◽  
Vol 8 (6) ◽  
pp. 943-953 ◽  
Author(s):  
Mukesh Kumar Khandelwal ◽  
Binod Kumar Kanaujia ◽  
Santanu Dwari ◽  
Sachin Kumar ◽  
Anil Kumar Gautam
Keyword(s):  
Circular Polarization ◽  
Ground Plane ◽  
Defected Ground Structure ◽  
Radiation Characteristics ◽  
Circularly Polarized ◽  
Left Hand ◽  
Right Hand ◽  
Defected Ground Structures ◽  
Ground Structures ◽  
Triple Band

Asymmetric slits loaded irregular shaped microstrip patch antenna with three different ground structures is proposed. All three antennas show triple band characteristics. First antenna with regular ground plane resonates at 1.95, 2.4, and 4.90 GHz with good radiation characteristics and shows right-hand circular polarization at 1.95 GHz. 18.75% of compactness is achieved with triple band characteristics. Further, same patch is used with different defected ground structures. Second antenna resonates at 1.85, 2.4, and 4.85 GHz with suppressed cross-polarization level and antenna shows right-hand circular polarization at 1.85 and 4.85 GHz. Compactness is further improved to the value of 22.91%. The third antenna resonates at 1.95, 2.4, and 4.85 GHz with better gain and radiation characteristics and antenna shows right-hand circular polarization at 1.95 and 2.4 GHz. The small frequency ratio f2/f1 is achieved and the value of f2/f1 is 1.29 and 1.23 for second and third configuration, respectively. Proposed structures show right-hand circularly polarized with suppressed left-hand circularly polarized radiations and suitable for fixed mobile wireless communication applications. All structures are analyzed using Ansoft HFSS v.14 based on finite element method and measured results satisfy the simulated results.

Singularities in the transverse fields of electromagnetic waves. II. Observations on the electric field

1987 ◽  
Vol 414 (1847) ◽  
pp. 447-468 ◽  
Keyword(s):  
Electric Field ◽  
Free Space ◽  
Electromagnetic Waves ◽  
Structural Features ◽  
Circularly Polarized ◽  
Left Hand ◽  
Right Hand ◽  
Transverse Fields

Electromagnetic waves propagating in free space contain three kinds of singularities called C lines, S surfaces and disclinations. The paper describes observations of these singularities in two different mono-chromatic microwave fields. The observations confirm all the theor­etically predicted properties of the singularities that could be tested. As expected, the singularities were found to be prominent structural features of the fields and in consequence to provide an economical means of characterizing their structure. A notable result is the observation of both right-hand and left-hand C lines in a field that is nominally uniformly left-hand circularly polarized. This is in agreement with the previous assertion that, in general, electromagnetic wavefields contain both right-hand and left-hand polarized regions.

The Position of a Type I Storm Source in the Magnetic Field of an Active Region

1973 ◽  
Vol 2 (4) ◽  
pp. 211-214 ◽  
Author(s):  
G. A. Dulk ◽  
G. J. Nelson
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Type I ◽  
Bipolar Structure ◽  
Circularly Polarized ◽  
One Dimensional ◽  
Left Hand ◽  
Right Hand ◽  
Sun Spots ◽  
The Magnetic Field

Type I storms generally occur in association with large sun-spots and the radiation is usually circularly polarized. Statistically it has been found that the sense of polarization, right-hand (RH) or left-hand (LH), usually corresponds to the ordinary magneto-ionic mode in the field of the dominant spot of the active region; when a following spot dominates, the polarization tends to be determined by this spot rather than by the leading field. One-dimensional position measurements show that the type I sources are usually not radially above the active region but are displaced by a few minutes of arc. The source sizes are about l′.2 to 4′.5 at 169 MHz and the sources frequently contain double, multiple or bipolar structure at 80 and 160 MHz.

scholarly journals A SYNCHRONOUS SUB-ARRAY CIRCULARLY POLARIZED MICROSTRIP ANTENNA FOR BISAR ONBOARD UAV

2018 ◽  
Author(s):  
Yohandri
Keyword(s):  
Circular Polarization ◽  
Microstrip Antenna ◽  
Axial Ratio ◽  
Array Antenna ◽  
Circularly Polarized ◽  
Left Hand ◽  
Right Hand ◽  
L Band

A circularly polarized microstrip antenna for bi-static SAR onboard UAV has been investigated. The both senseof the circular polarization left-hand circularly polarized (LHCP) and right-hand circularly polarized (RHCP) arecan be achieved on experimental and simulation. The 2x2 sub array antenna operated in 1.176 (L-band) withnovel proximity synchronous feed method has been designed, fabricated, and evaluated to show the characteristic of the antenna. The measured result give the axial ratio bandwidth (<3dB) of about 28 MHz (2%), whichconsistent with the simulated result of about 27 MHz (2%). These results satisfy the specification for our BiSARsystem installed onboard UAV.

scholarly journals Simple Reconfigurable Circularly Polarized Antenna at Three Bands

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2316 ◽  
Author(s):  
Tu Le ◽  
Han-Young Park ◽  
Tae-Yeoul Yun
Keyword(s):  
Axial Ratio ◽  
Loop Antenna ◽  
Impedance Bandwidth ◽  
Simple Design ◽  
Pin Diodes ◽  
Circularly Polarized ◽  
Left Hand ◽  
Fabrication Cost ◽  
Right Hand ◽  
Triple Band

In this paper, a simple design for a triple-band circularly polarized (CP) antenna with the capability of switching its polarization between dual-sense CPs is presented. The proposed antenna is comprised of a monopole loop antenna as a primary radiator. By placing a parasitic loop around the primary radiator, an additional CP band is achieved. Reconfigurability of the polarization between right-hand CP (RHCP) and left-hand CP (LHCP) at three different frequencies of 2.5, 3.3, and 3.8 GHz was realized by controlling the ON/OFF states of two PIN diodes. For validation, the fabricated antenna yielded an impedance bandwidth of 52.6% (2.34–4.01 GHz), while the axial ratio bandwidths for both the RHCP and LHCP states were 3.5% (2.47–2.56 GHz), 6.6% (3.20–3.42 GHz), and 2.4% (3.74–3.83 GHz). The measured broadside gains within the axial ratio bandwidth were 1.2, 2.7, and 1.4 dBi, respectively. Compared to other reconfigurable multi-band CP antennas, the proposed design is the first work to achieve a reconfigurable polarization at three distinct bands at a low fabrication cost by using only two diodes. The proposed antenna is suitable for WLAN and WiMAX applications.

scholarly journals Dual Edge-Fed Left Hand and Right Hand Circularly Polarized Rectangular Micro-Strip Patch Antenna for Wireless Communication Applications

2020 ◽  
Vol 2 (3) ◽  
pp. 107-117
Author(s):  
Dr. V. Prakasam ◽  
Dr. P. Sandeep
Keyword(s):  
Data Transmission ◽  
Patch Antenna ◽  
Thinking Skills ◽  
Full Time ◽  
Ieee 802.11A ◽  
Circularly Polarized ◽  
Left Hand ◽  
Right Hand ◽  
Low Profile ◽  
Paper Work

Presently a days the remote correspondence framework advancement requires the ease, low profile, insignificant weight radio wire improvement which is cultivated of proceeding with incredible introduction finished a wide recurrence range. The MSPA architecture has facilitated this forward thinking skills trend. Within this paper work a 4.85 GHz circular polarization operating frequency is planned and simulated for RMSPA. The proposed antenna is capable of designing and inducing Left Hand Loop Polarization (LHCP) and Right Hand Loop Polarization (RHCP) using a cross-coupler that is directly attached to the micro-strip antenna to polarize the circular. The proposed paper work working recurrence is 4.85 GHz which is essentially utilized for satellite interchanges, full-time satellite TV organizations. This working recurrence is the IEEE 802.11a variation C band recurrence and this C band recurrence is utilized in Wi-Fi gadgets and Radio LAN. The proposed FR-4 roundabout polarization rectangular miniature strip fix radio wire is 1.6 mm thick. The proposed rectangular micro strip fix radio wire is planned and mimicked utilizing CSTMWS (Computer Simulation Technology Micro Wave Studio) programming. The full or working recurrence of proposed radio wire presents at 4.85 GHz for remote correspondences that gives S boundaries, data transmission and radiation example of Gain and directivity.

Editorial Note

1946 ◽  
Vol 11 (1) ◽  
pp. 2-2
Keyword(s):  
Editorial Note ◽  
Speech Sounds ◽  
Left Hand ◽  
Hand Column ◽  
Right Hand ◽  
Infant Speech ◽  
The Right

In the article “Infant Speech Sounds and Intelligence” by Orvis C. Irwin and Han Piao Chen, in the December 1945 issue of the Journal, the paragraph which begins at the bottom of the left hand column on page 295 should have been placed immediately below the first paragraph at the top of the right hand column on page 296. To the authors we express our sincere apologies.

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