scholarly journals A small footprint printed cross-dipole antenna with wide impedance bandwidth and circular polarization

2021 ◽  
Vol 24 (1) ◽  
pp. 347
Author(s):  
Mustafa Hasan ◽  
Nasr Alkhafaji ◽  
Hussam AlAnsary ◽  
Azhar R. Mohsin
Keyword(s):  
Axial Ratio ◽  
Local Area ◽  
Dipole Antenna ◽  
Impedance Bandwidth ◽  
The Finite Element Method ◽  
Dipole Antennas ◽  
Low Profile ◽  
Small Footprint ◽  
Coaxial Probe ◽  
Flat Ground

Wideband circularly polarized (CP) cross-dipole antennas with flat, cavity and artificial magnetic conductor (AMC) reflectors are proposed. Each proposed antenna consists of a pair of driven dipoles, a pair of vacant-quarter printed rings, and a 50Ω coaxial probe. The boomerang shape has been adopted in the crossed-dipole. This shape makes the design more compact, so it can be a good candidate in the antenna array because of reducing the mutual coupling. All numerical simulation works have been done using the ANSYS electromagnetic (EM) software based on the finite element method (FEM) algorithm. The presented crossed-dipole with a cavity has the best performance compared to ones with conventional flat and AMC grounds. However, the crossed-dipole with the AMC ground is a low-profile structure. Thus, the paper investigates and discusses the results of the proposed strctures thoroughly. The obtained impedance bandwidth (IBW) is 42% (5.1-7.85 GHz) and the axial-ratio bandwidth (ARBW) is 7.72% (5.86-6.32 GHz) for the crossed-dipole with the conventional flat ground (i.e., reflector). Furthermore, the IBW and ARBW for the antenna with the cavity reflector are 50.37% (5.08-8.5 GHz) and 26.4% (5.72-7.46 GHz), respectively. The antenna with the AMC ground has the characterstics of the IBW and ARBW as 38.16% (5.36-7.89 GHz) and 15.16% (5.79-6.74 GHz), respectively. All structures are designed to operate for the C-band and wireless local area networks (WLAN) applications.

scholarly journals CPW-fed circularly-polarized antenna array with high front-to-back ratio and low-profile

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 651-655 ◽  
Author(s):  
Yilin Liu ◽  
Kama Huang
Keyword(s):  
Antenna Array ◽  
Coplanar Waveguide ◽  
Ground Plane ◽  
Axial Ratio ◽  
Antenna Design ◽  
Impedance Bandwidth ◽  
Feeding Method ◽  
Circularly Polarized ◽  
Low Profile ◽  
Novel Design

Abstract A novel design of a coplanar waveguide (CPW) feed antenna array with circular polarization (CP) and a high front-to-back ratio is described. The proposed CP array is achieved by using a compact CPW–slotline transition network etched in the ground plane. The measured results show that this kind of feeding method can improve the impedance bandwidth, as well as the axial ratio bandwidth of the CP antenna array and provide adequate gain. The proposed array can achieve a 6.08% impedance bandwidth and a 4.10% CP bandwidth. Details of the antenna design and experimental results are presented and discussed.

Development and Miniaturized of Circularly Polarization Diversity at Cavity Backed SIW Antenna for X-Band Application

Frequenz ◽  
2019 ◽  
Vol 73 (9-10) ◽  
pp. 317-320
Author(s):  
Saeid Karamzadeh ◽  
Vahid Rafiei ◽  
Hasan Saygin
Keyword(s):  
Schottky Diodes ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Polarization Diversity ◽  
Circularly Polarized ◽  
Left Hand ◽  
Low Profile ◽  
X Band ◽  
Coaxial Feed ◽  
Good Agreement

Abstract In this work circularly polarization diversity has been achieved by utilizing two Schottky diodes on low profile cavity-backed substrate integrated waveguide (CBSIW). In comparison with other studies in the literature, the size of antenna has been reduced to 0.54λg × 0.76λg by helping a 50-Ohm coaxial feed line. The impedance bandwidth, axial ratio bandwidth and antenna gain are improved to 10.02 %, 5.2 % and 7.68dBi, respectively. In addition, the proposed antenna can generate either a left-hand circularly polarized (LHCP) or a right-hand circularly polarized (RHCP) radiation. The developed antenna was fabricated and tested and the achieved results were in good agreement with the simulated one.

scholarly journals Beamwidth-Enhanced Low-Profile Dual-Band Circular Polarized Patch Antenna for CNSS Applications

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Hongmei Liu ◽  
Chenhui Xun ◽  
Shaojun Fang ◽  
Zhongbao Wang
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
Axial Ratio ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Coupled Line ◽  
Low Profile ◽  
Feed Network ◽  
Single Input ◽  
Half Power

A low-profile dual-band circular polarized (CP) patch antenna with wide half-power beamwidths (HPBWs) is presented for CNSS applications. Simple stacked circular patches are used to achieve dual-band radiation. To enhance the HPBW for the two operation bands, a dual annular parasitic metal strip (D-APMS) combined with reduced ground plane (R-GP) is presented. A single-input feed network based on the coupled line transdirectional (CL-TRD) coupler is also proposed to provide two orthogonal modes at the two frequency bands simultaneously. Experimental results show that the 10 dB impedance bandwidth is 32.7%. The 3 dB axial ratio (AR) bandwidths for the lower and upper bands are 4.1% and 6.5%, respectively. At 1.207 GHz, the antenna has the HPBW of 123° and 103° in the xoz and yoz planes, separately. And the values are 127° and 113° at 1.561 GHz.

A compact polarization reconfigurable stacked microstrip antenna for WiMAX application

2020 ◽  
pp. 1-16
Author(s):  
Murari Shaw ◽  
Niranjan Mandal ◽  
Malay Gangopadhyay
Keyword(s):  
Microstrip Antenna ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Circularly Polarized ◽  
Rectangular Slot ◽  
Substrate Layer ◽  
Linearly Polarized ◽  
Coaxial Probe

Abstract In this paper, a stacked microstrip patch antenna with polarization reconfigurable property has been proposed for worldwide interoperability for microwave access (WiMAX) application. The proposed antenna has two substrate layers: upper and lower layers with two radiating patches connected with the coaxial probe. Without the upper layer the lower square-shaped substrate layer having regular hexagonal radiating patch with probe fed acts as a linear polarized antenna with impedance bandwidth for (S11 ≤ −10 dB) is 370 MHz 10.56% (3.32–3.69 GHz) cover WiMAX (3.4–3.69 GHz) application band. The hexagonal radiating patch is perturbed with an optimum rectangular slot to enhance the impedance bandwidth of the antenna. The lower substrate layer having hexagonal patch with the same probe position is stacked with the upper square-shaped substrate layer with same sized square patch and the upper patch soldered with the coaxial probe. The overall stacked antenna generates a circularly polarized band when the opposite corner of the top square radiating patch of the upper layer is truncated with optimum size. In order to generate another circularly polarized band and to improve the input impedance matching of the stacked antenna, the top radiating patch is perturbed with two slots and a slit. The stacked circularly polarized antenna generates impedance bandwidth of 12.75% (3.23–3.67 GHz) for (S11 ≤ −10 dB) with two circularly polarized bands (3.34–3.37 GHz) and (3.66–3.70 GHz) as per (axial ratio ≤ 3 dB) for WiMAX application. Therefore, the proposed antenna can be used as linearly polarized or dual band circularly polarized according to requirement.

scholarly journals A Low-Profile Circularly Polarized Conical-Beam Antenna with Wide Overlap Bandwidth

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Wei He ◽  
Yejun He ◽  
Long Zhang ◽  
Sai-Wai Wong ◽  
Wenting Li ◽  
...  
Keyword(s):  
Electric Field ◽  
Patch Antenna ◽  
Ground Plane ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Beam Radiation ◽  
Circularly Polarized ◽  
Low Profile ◽  
Two Sides ◽  
Conical Beam

In this paper, a low-profile circularly polarized (CP) conical-beam antenna with a wide overlap bandwidth is presented. Such an antenna is constructed on the two sides of a square substrate. The antenna consists of a wideband monopolar patch antenna fed by a probe in the center and two sets of arc-hook-shaped branches. The monopolar patch antenna is loaded by a set of conductive shorting vias to achieve a wideband vertically polarized electric field. Two sets of arc-hook-shaped parasitic branches connected to the patch and ground plane can generate a horizontally polarized electric field. To further increase the bandwidth of the horizontally polarized electric field, two types of arc-hook-shaped branches with different sizes are used, which can generate another resonant frequency. When the parameters of the arc-hook-shaped branches are reasonably adjusted, a 90° phase difference can be generated between the vertically polarized electric field and the horizontally polarized electric field, so that the antenna can produce a wideband CP radiation pattern with a conical beam. The proposed antenna has a wide impedance bandwidth ( ∣ S 11 ∣ < − 10   dB ) of 35.6% (4.97-7.14 GHz) and a 3 dB axial ratio (AR) bandwidth at phi = 0 ° and theta = 35 ° of about 30.1% (4.97-6.73 GHz). Compared with the earlier reported conical-beam CP antennas, an important feature of the proposed antenna is that the AR bandwidth is completely included in the impedance bandwidth, that is, the overlap bandwidth of ∣ S 11 ∣ < − 10   dB and AR < 3   dB is 30.1%. Moreover, the stable omnidirectional conical-beam radiation patterns can be maintained within the whole operational bandwidth.

Slot loaded EBG-based metasurface for performance improvement of circularly polarized antenna for WiMAX applications

2019 ◽  
Vol 12 (3) ◽  
pp. 212-220 ◽  
Author(s):  
Alka Verma ◽  
Anil Kumar Singh ◽  
Neelam Srivastava ◽  
Shilpee Patil ◽  
Binod Kumar Kanaujia
Keyword(s):  
Performance Improvement ◽  
Coplanar Waveguide ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Compact Structure ◽  
Circularly Polarized ◽  
Feed Line ◽  
Rectangular Patch ◽  
Low Profile ◽  
Good Agreement

AbstractIn this paper, an electromagnetic band gap (EBG) metasurface (MS) superstrate-based circularly polarized antenna for the WiMAX (3.5 GHz) band is proposed. The proposed structure comprises a 2 × 2 slot-loaded rectangular patch MS array that can be perceived as a polarization-dependent EBG MS superstrate. Furthermore, to achieve circular polarization, the proposed antenna has an inclined coupling slot onto the ground with a conventional coplanar waveguide feed line. The proposed antenna has a compact structure with a low profile of 0.037λ0 (λ0 stands for the free-space wavelength at 3.48 GHz) and a ground size of 30 × 30 mm2. The measured results show that the −10 dB impedance bandwidth for the proposed antenna is 34.6% and the 3-dB axial ratio (AR) bandwidth is 6.8% with a peak gain of 3.91 dBi in the desired operating band. Good agreement between the simulated and the measured results verifies the performance of the proposed antenna.

A novel uniplanar wideband magneto-electric dipole antenna element

2017 ◽  
Vol 9 (10) ◽  
pp. 1983-1989
Author(s):  
Chen-Yang Shuai ◽  
Guang-Ming Wang ◽  
Ya-Wei Wang
Keyword(s):  
Electric Dipole ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ground Plane ◽  
Local Area ◽  
Dipole Antenna ◽  
Impedance Bandwidth ◽  
Antenna Element ◽  
Area Network ◽  
Circular Loop

A novel uniplanar wideband magneto-electric dipole antenna element is proposed in this paper. The proposed antenna is composed of the conventional bow-tie radiation patch as an electric dipole, a semi-circular loop, which works as a magnetic dipole, a coplanar ground plane, two directors with different lengths for enhancing gain, and a microstrip-to-coplanar stripline transition balun. The designed antenna adopts a small-size coplanar ground plane to achieve a uniplanar structure. Consequently, this method reduces the space size immensely and makes the antenna suitable for the array application. In addition, a tapered slot structure is utilized to improve impedance matching. The prototype of the proposed antenna was fabricated and measured. The measured results keep in good accordance with the simulated ones. The simulated results show that the proposed antenna obtains a broad impedance bandwidth of 60.5% from 2.25 to 4.20 GHz (voltage standing wave ratio [VSWR] ≤ 2) which can be applied for wireless local area network (WLAN) (2.4–2.484 GHz), worldwide interoperability for microwave access (WiMAX) (2.5–2.69/3.4–3.69 GHz), and long term evolution (LTE) (2.5–2.69 GHz). Meanwhile, the stable gain, low cross-polarization, stable unidirectional radiation patterns, and low back lobe are obtained within the operating frequency band. The array composed of the proposed antenna elements is also investigated in this paper.

scholarly journals Application of Novel Printed Dipole Antenna to Design Broadband Planar Phased Array

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Jie Xu ◽  
Wenbin Dou
Keyword(s):  
Mutual Coupling ◽  
Phased Array ◽  
Coupling Effect ◽  
Dipole Antenna ◽  
Coaxial Cable ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Dipole Antennas ◽  
Outer Conductor ◽  
Ground Plate

A broadband planar phased array consisting of 22 linear printed dipole antennas (PDA) is presented in this paper. The element is designed by a coax probe feeding mechanism with a ground plate configuration. The PDA with two arms placed on both sides of a substrate is realized. The inner conductor of the coaxial cable is connected to the PDA’s upper arm, and the outer conductor is connected to the PDA’s lower arm, so it eliminates the balun. The impedance bandwidth of the PDA array can be improved by increasing mutual coupling effect between the adjacent array elements. A dielectric layer, which is integrated on the surface of the antenna, is designed and fabricated to improve the impedance bandwidth and to shield the array. The measured results indicate the active VSWR is less than 3 over the frequency range of 4–20 GHz.

scholarly journals Novel Wideband Circularly Polarized DRA With Squint-free Radiation Characteristics

2020 ◽  
Author(s):  
Mohammad Abedian ◽  
Mohsen Khalily ◽  
Vikrant Singh ◽  
Pei Xiao ◽  
Rahim Tafazolli ◽  
...  
Keyword(s):  
Dielectric Resonator ◽  
Vertical Section ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Dielectric Resonator Antenna ◽  
Radiation Characteristics ◽  
Horizontal Section ◽  
Circularly Polarized ◽  
Metal Element ◽  
Coaxial Probe

Abstract A new single-fed circularly polarized dielectric resonator antenna (CP-DRA) without beam squint is presented. The DRA comprises of an S-shaped dielectric resonator (SDR) with a metalized edge and two rectangular dielectric resonator (RDRs) blocks. A horizontal-section is applied as an extension of the SDR, and a vertical-section is placed in parallel to the metallic edge. A vertical coaxial probe is used to excite the SDR and the vertical RDR blocks through an S-shaped metal element and a small rectangular metal strip, respectively. The two added RDRs that form an L-shaped DR improve the radiation characteristics and compensate for the beam squint errors. A wideband CP performance is achieved due to the excitation of several orthogonal modes such as TEx d11, TEy 1d1, TEz 121, TEy 112, TEx 131, and TEy 311. The experimental results demonstrate an impedance bandwidth of approximately 66:8% (3:71-7:45 GHz) and a 3-dB axial-ratio (AR) bandwidth of about 54:8% (3:72-6:53 GHz) with a stable broadside beam achieving a measured peak gain of about 4:64dBi. Furthermore, a 100% correction in beam squint value from q = 41° to q = 0° with respect to the antenna boresight is achieved.

scholarly journals Double Meander Dipole Antenna Array with Enhanced Bandwidth and Gain

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Halgurd N. Awl ◽  
Rashad H. Mahmud ◽  
Bakhtiar A. Karim ◽  
Yadgar I. Abdulkarim ◽  
Muharrem Karaaslan ◽  
...  
Keyword(s):  
Antenna Array ◽  
High Gain ◽  
Dipole Antenna ◽  
Operating Frequency ◽  
Center Frequency ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Wide Bandwidth ◽  
Low Profile ◽  
Operating Frequency Range

In this paper, a new design of high gain and wide bandwidth microstrip patch antenna array containing double meander dipole structure is proposed. Two in-phase resonant frequencies in the Ku-band (12–18 GHz) could be achieved in the double meander dipole array structure, which lead to enhance impedance bandwidth without costing extra design section. Besides, further enhanced gain of 2 dBi of the array over the entire operating frequency range has been achieved by introducing a double-layer substrate technique. The proposed antenna has been fabricated using the E33 model LPKF prototyping PCB machine. The measurement results have been performed, and they are in very good agreement with the simulation results. The measured –10 dB impedance bandwidth indicates that the array provides a very wide bandwidth which is around 30% at the center frequency of 15.5 GHz. A stable gain with a peak value of 10 dBi is achieved over the operating frequency range. The E- and H-plane radiation patterns are simulated, and a very low sidelobe level is predicted. The proposed antenna is simple and has relatively low-profile, and it could be a good candidate for millimeter wave communications.

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