scholarly journals Circularly Polarized Triband Printed Quasi-Yagi Antenna for Millimeter-Wave Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Dalia M. Elsheakh ◽  
Magdy F. Iskander
Keyword(s):  
Circular Polarization ◽  
Printed Circuit Board ◽  
Ground Plane ◽  
Axial Ratio ◽  
Circuit Board ◽  
Impedance Bandwidth ◽  
60 Ghz ◽  
Antenna Structure ◽  
Circularly Polarized ◽  
Yagi Antenna

This paper describes the design and development of a triband with circularly polarized quasi-Yagi antenna for ka-band and short range wireless communications applications. The proposed antenna consists of an integrated balun-fed printed dipole, parasitic folded dipole and a short strip, and a modified ground plane. The antenna structure, together with the parasitic elements, is designed to achieve circular polarization and triband operating at resonant frequencies of 13.5 GHz, 30 GHz, and 60 GHz. Antenna design was first simulated using HFSS ver.14, and the obtained results were compared with experimental measurements on a prototype developed on a single printed circuit board. Achieved characteristics include −10 dB impedance bandwidth at the desired bands, circular polarization axial ratioAR<3 dB, front to back ratio of 6 dB, gain value of about 4 dBi, and average radiation efficiency of 60%. The paper includes comparison between simulation and experimental results.

ANALYSIS PERFORMANCE OF SINGLY-FED CIRCULARLY POLARIZED MICROSTRIP ANTENNA FOR WIRELESS COMMUNICATION

2016 ◽  
Vol 78 (5-9) ◽  
Author(s):  
Muhammad Fauzan Edy Purnomo ◽  
Hadi Suyono ◽  
Panca Mudjirahardjo ◽  
Rini Nur Hasanah
Keyword(s):  
Wireless Communication ◽  
Circular Polarization ◽  
Microstrip Antenna ◽  
Axial Ratio ◽  
Microstrip Antennas ◽  
Impedance Bandwidth ◽  
Antenna Structure ◽  
Circularly Polarized ◽  
Large Bandwidth ◽  
Doubly Fed

The circularly polarized (CP) microstrip antennas, both of singly- and doubly-fed types, possess inherent limitation in gain, impedance and axial-ratio bandwidths. These limitations are caused mainly by the natural resonance of the patch antenna which has a high unloaded Q-factor and the frequency-dependent excitation of two degenerative modes (TM01 and TM10) when using a single feed. Many applications which require circular polarization, large bandwidth, and good performance, especially in the field of wireless communication, are still difficult to be designed by using antenna software. Some consideration to take will include the application target and design specification, the materials to be used, and the method to choose (formula, numerical analysis, etc). This paper explains and analyzes the singly-fed microstrip antenna with circular polarization and large bandwidth. This singly-fed type of microstrip antenna provides certain advantage of requiring no external circular polarizer, e.g. the 900 hybrid, as it only needs to apply some perturbation or modification to a patch radiator with a standard geometry. The design of CP and large-bandwidth microstrip antenna is done gradually, by firstly truncating one tip, then truncating the whole three tips, and finally modifying it into a pentagonal patch structure and adding an air-gap to obtain larger bandwidths of impedance, gain and axial ratio. The last one antenna structure results in a novelty because it is a rare design of antenna which includes all types of bandwidth (impedance, gain, and axial ratio) being simultaneously larger than the origin antenna. The resulted characteristic performance of the 1-tip (one-tip) antenna shows respectively 1.9% of impedance bandwidth, 3.1% of gain bandwidth, and 0.45% of axial-ratio bandwidth. For the 3-tip (three-tip) step, the resulted bandwidths of respectively impedance, gain, and axial ratio are 1.7%, 3.3% and 0.5%. The pentagonal structure resulted in the bandwith values of 15.67%, 52.16% and 4.11% respectively for impedance, gain, and axial ratio. 

scholarly journals A Millimeter-Wave Wideband Circularly Polarized Planar Spiral Antenna Array with Unequal Amplitude Feeding Network

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Huakang Chen ◽  
Yu Shao ◽  
Zhangjian He ◽  
Changhong Zhang ◽  
Zhizhong Zhang
Keyword(s):  
Antenna Array ◽  
Millimeter Wave ◽  
Printed Circuit Board ◽  
Low Cost ◽  
Axial Ratio ◽  
Circuit Board ◽  
Impedance Bandwidth ◽  
Side Lobe Level ◽  
Archimedean Spiral ◽  
Circularly Polarized

A 2 × 2 wideband circularly polarized (CP) antenna array operating at millimeter wave (mmWave) band is presented. The array element is a wideband CP Archimedean spiral radiator with special-shaped ring slot. The elements are fed by an unequal amplitude (UA) feeding network based on a microstrip line (MSL) power divider. The side lobe level is improved by this UA feeding network. In addition, a cross slot is employed to isolate the elements for decoupling. A prototype is fabricated, and the measured results show that the proposed array achieves an impedance bandwidth (IBW) of 6.31 GHz (22.5% referring to 28 GHz) and an axial ratio bandwidth (ARBW) of 7.32 GHz (26.1% referring to 28 GHz). The peak gain of the proposed array is 11.3 dBic, and the gain is greater than 9.3 dBic within the whole desired band (from 25 GHz to 31 GHz). The proposed array consists of only one substrate layer and can be built by the conventional printed circuit board technology. Attributed to the characteristics of wide bandwidth, simple structure, low profile, and low cost, the proposed antenna array has a great potential in mmWave wireless communications.

Wideband Inverted-L Microstrip-via-Fed Circularly Polarized Antenna with Asymmetrical Ground for WLAN/Wimax Applications

Frequenz ◽  
2018 ◽  
Vol 72 (7-8) ◽  
pp. 333-341 ◽  
Author(s):  
Qiang Chen ◽  
Hou Zhang ◽  
Lu-chun Yang ◽  
Bin-bin Li ◽  
Xue-liang Min
Keyword(s):  
Circular Polarization ◽  
Parametric Study ◽  
Ground Plane ◽  
Axial Ratio ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Circularly Polarized ◽  
Large Bandwidth ◽  
Circularly Polarized Radiation ◽  
Polarized Radiation

Abstract A design with wideband and circularly polarized radiation antenna from an open-slot antenna has been demonstrated in this paper. The proposed antenna, which consists of an open slot and an inverted-L strip feeding, provides a large bandwidth, which completely cover the Wimax (3.3–3.8 GHz) and WLAN (2.4–2.48 GHz) bands. The open slot is formed by an modified ground plane with a slit cut and monofilar spiral stubs employed, which fed by an asymmetrical inverted-L strip feedline using a via. As demonstrated, the CP operation was significantly improved by loading monofilar spiral stubs connected to the asymmetric feedline by means of a via. A parametric study of the key parameters is made and the mechanism for circular polarization is described. After optimization, the impedance bandwidth is approximately 3.78 GHz (2.12 to 5.9 GHz) and the 3 dB axial ratio bandwidth is approximately 2.75 GHz (2.2 to 4.95 GHz), which represent fractional bandwidths of approximately 94.3 % and 76.9 %, respectively.

CPW-fed Circularly Polarized Slot Antenna with Small Gap and Stick-shaped Shorted Strip for UHF FRID Readers

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 181-188
Author(s):  
Chien-Yuan Pan ◽  
Chum-Chieh Su ◽  
Wei-Lin Yang
Keyword(s):  
Radio Frequency Identification ◽  
Coplanar Waveguide ◽  
Ground Plane ◽  
Axial Ratio ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Magnetic Current ◽  
Antenna Structure ◽  
Circularly Polarized ◽  
Rectangular Slot

Abstract A new circularly polarized (CP) slot antenna with a small gap and a stick-shaped shorted strip is presented. The proposed antenna has a sufficient bandwidth for ultrahigh frequency (UHF) radio-frequency identification (RFID) reader applications. The antenna structure consists of a rectangular slot with a small gap, a stick-shaped shorted strip and a 50 Ω coplanar waveguide (CPW) feedline with an asymmetrical ground plane. By using the stick -shaped shorted strip to disturb magnetic current distribution on the slot, the CP radiation can be generated. The measured results demonstrate that the proposed antenna can reach a 10 dB return loss impedance bandwidth of 14.1 % (894–1030 MHz) and a 3 dB axial ratio (AR) bandwidth of 6.4 % (910–970 MHz). The whole antenna size is 80 × 80 × 1.6 mm3.

scholarly journals A Miniaturized and Circularly Polarized L-Shaped Slot Antenna for Ultra-wideband Applications

2019 ◽  
Vol 8 (4) ◽  
pp. 2133-2139
Keyword(s):  
Circular Polarization ◽  
Radiation Pattern ◽  
Ground Plane ◽  
Axial Ratio ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Circularly Polarized ◽  
Antenna Size

A miniaturized microstrip-fed, wideband and circularly polarized L-shaped slot antenna is designed for ultra-wideband applications. To realize L-shaped slot antenna with wide impedance bandwidth, a stub of size 10.7 mm2 is added to a rectangular shaped slot of the ground plane. The position of the feedline is optimized to attain wide circular polarization bandwidth. The proposed antenna size is very small i.e., 25×25 mm2 . A prototype of the design is fabricated and measured. The axial ratio bandwidth (ARBW< 3 dB) of 2.2 GHz (from 6.2 GHz to 8.4 GHz) and the impedance bandwidth (S11<-10 dB) of 7.4 GHz (from 2.5 GHz to 9.9 GHz) is achieved by the proposed design. Moreover, the antenna achieves a stable radiation pattern and a gain of more than 2.8 dBi over the complete ARBW. The advantages of the structure are miniaturized design, having wide impedance bandwidth, and broad ARBW

Microstrip-line-fed inverted L-shaped circularly polarized antenna for C-band applications

2021 ◽  
pp. 1-9
Author(s):  
Karunesh Srivastava ◽  
Brijesh Mishra ◽  
Rajeev Singh
Keyword(s):  
Circular Polarization ◽  
High Frequency ◽  
Microstrip Line ◽  
Ground Plane ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Circularly Polarized ◽  
High Frequency Structure Simulator ◽  
Frequency Structure ◽  
Peak Gain

Abstract A circularly polarized stub-matched inverted L-shaped antenna for C-band applications is presented in this communication. Antenna parameters of inverted L-shape on the radiating patch and slits, notch, square strips and stub on the ground plane and the effect of these are analyzed. The proposed optimized antenna (A5: 0.54λ0 × 0.54λ0 × 0.02λ0 mm3) is selected among antennas (A1 – A5) with 5.1 GHz design frequency after simulation through high-frequency structure simulator (HFSS). Circular polarization is obtained by introducing stub/perturbation on the ground plane. By introducing stub, the highest measured (S11 < − 10 dB) impedance bandwidth of 50.9% (3.48 – 5.86 GHz) is observed amongst the reported and compared bandwidths. Peak gain of 5.32 dBi and 3 dB axial ratio bandwidth of 16.2% (4.71 – 5.54 GHz) is reported in the present work. An antenna is useful in the entire downlink frequency (3.7 – 4.2 GHz) of the C band.

scholarly journals Square Slot Antenna for Wide Circularly Polarized Bandwidth and Axial Ratio Beamwidth

2021 ◽  
Vol 17 (1) ◽  
pp. 1-11
Author(s):  
Vijay Sharma ◽  
Tejpal Jhajharia
Keyword(s):  
Circular Polarization ◽  
Coplanar Waveguide ◽  
Ground Plane ◽  
Axial Ratio ◽  
Polarization Characteristic ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Antenna Structure ◽  
The Right

Abstract The article proposes design investigation and experimental results of a coplanar waveguide (CPW) fed square slot antenna that gives wideband circular polarization. This circular polarization characteristic is achieved by embedding a square shape stub to left bottom corner and an L-shaped strip to the right upper corner of the slot. A high impedance bandwidth of 87.8 % (3.6–9.0 GHz), a wide axial ratio bandwidth of 73.05 % (4.2–9.0 GHz) and wide 3-dB axial ratio beamwidth of 90° in the entire frequency range of interest are achieved with this antenna structure. To improve the 3-dB axial ratio bandwidth, three slots (two horizontal and one vertical) are scratched at the exterior periphery of the ground plane. These perturbation assemblies are accountable to excite orthogonal modes and help increase an axial ratio bandwidth. The designed antenna displays the constant and steady radiation patterns in the complete frequency range of concern. The overall dimension of the presented compact antenna is 0.24λ × 0.24λ × 0.01λ.

scholarly journals Broadband Dual Circularly Polarized Magnetoelectric Dipole Antenna Fed by a Miniaturized Six-Branch Hybrid Coupler

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Changhong Zhang ◽  
Xianling Liang ◽  
Junping Geng ◽  
Ronghong Jin
Keyword(s):  
Printed Circuit Board ◽  
Axial Ratio ◽  
Dipole Antenna ◽  
Polarization Measurement ◽  
Circuit Board ◽  
Impedance Bandwidth ◽  
Circularly Polarized ◽  
Linearly Polarized ◽  
Previous Design ◽  
Hybrid Coupler

A broadband dual circularly polarized magnetoelectric dipole antenna (MEDA) fed by a miniaturized six-branch hybrid coupler (SBHC) is presented in this paper. First, a dual linearly polarized MEDA with a bandwidth of 73.3% is developed based on the previous design with a bandwidth of 52%. The SBHC, with a miniaturized size of 53%, is designed on a printed circuit board underneath the ground of the MEDA, which possesses an efficient bandwidth of 80.7% to generate the antenna for dual circular polarization. Measurement results show that the proposed dual circularly polarized MEDA achieves an impedance bandwidth of 84.5%, an axial-ratio bandwidth of 81.8%, and a nearly symmetrical, stable unidirectional radiation pattern with an average gain of 8 dBic over its impedance bandwidth.

A corrugated G-shaped grounded ring slot antenna for wideband circular polarization

2020 ◽  
Vol 12 (5) ◽  
pp. 431-436
Author(s):  
Kapil Saraswat ◽  
Trivesh Kumar ◽  
A. R. Harish
Keyword(s):  
Circular Polarization ◽  
Coplanar Waveguide ◽  
Ground Plane ◽  
Axial Ratio ◽  
Design Guidelines ◽  
Slot Antenna ◽  
Element Approximation ◽  
Slot Antennas ◽  
Antenna Structure ◽  
Circularly Polarized

AbstractIn this paper, a wideband circularly polarized corrugated G-shaped grounded ring slot antenna is presented. The proposed antenna structure is excited using a coplanar waveguide-fed monopole antenna, which is placed inside a corrugated G-shaped grounded ring. Due to the asymmetry in the ground plane, two orthogonal modes, having equal magnitude and out of phase by 90° are excited, resulting in circular polarization (CP). The generation of the CP in the proposed antenna structure is explained using thin dipole current element approximation. A prototype of the proposed antenna is fabricated and tested. The measured results exhibit a 3 dB axial ratio bandwidth of 37.6% (2.22–3.25 GHz), and reflection coefficient bandwidth (|S11| ≤ −10 dB) of 47.91% (2.13–3.47 GHz). Additionally, the design guidelines are also presented for G-shaped grounded ring slot antennas.

A Broadband Circularly Polarized Cross-slotted Patch Antenna with Horizontal Meandered Strip (HMS)

Frequenz ◽  
2020 ◽  
Vol 74 (5-6) ◽  
pp. 191-199
Author(s):  
M. K. Verma ◽  
Binod K. Kanaujia ◽  
J. P. Saini ◽  
Padam S. Saini
Keyword(s):  
Circular Polarization ◽  
Patch Antenna ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Radiation Patterns ◽  
Circularly Polarized ◽  
Feeding Technique

AbstractA broadband circularly polarized slotted square patch antenna with horizontal meandered strip (HMS) is presented and studied. The HMS feeding technique provides the good impedance matching and broadside symmetrical radiation patterns. A set of cross asymmetrical slots are etched on the radiating patch to realize the circular polarization. An electrically small stub is added on the edge of the antenna for further improvement in performance. Measured 10-dB impedance bandwidth (IBW) and 3-dB axial ratio bandwidth (ARBW) of the proposed antenna are 32.31 % (3.14–4.35 GHz) and 20.91 % (3.34–4.12 GHz), respectively. The gain of the antenna is varied from 3.5 to 4.86dBi within 3-dB ARBW. Measured results matched well with the simulated results.

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