scholarly journals Analysis of Beamforming Antenna for Practical Indoor Location-Tracking Application

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3040 ◽  
Author(s):  
Sun-Woong Kim ◽  
Dong-You Choi
Keyword(s):  
Array Antenna ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Main Beam ◽  
Impedance Bandwidth ◽  
Location Tracking ◽  
Indoor Location ◽  
Butler Matrix ◽  
Wide Range ◽  
Wideband Radar

The single antenna used in conventional ultra-wideband radar has difficulty tracking targets over a wide range because of a relatively narrow beamwidth. Herein, we propose a beamforming antenna that can track targets over a wide range by electronically controlling the main beam of the antenna. The proposed beamforming antenna was fabricated by connecting a 1 × 4 linear array antenna and a 4 × 4 Butler matrix. The Butler matrix was fabricated in a laminated substrate using two TRF-45 substrates. Furthermore, the input Ports 1–4 generate a phase difference at regular intervals in each output port, and the output phase is fed to the array antenna. The proposed tapered-slot antenna was fabricated on a Taconic TLY substrate, and the impedance bandwidth of the antenna was achieved within a wide bandwidth of 4.32 GHz by satisfying a VSWR (Voltage Standing Wave Ratio) ≤2 within the 1.45–5.78 GHz band. Furthermore, the fabricated antenna has directional radiation patterns, which was found to be a suitable characsteristic for location tracking in a certain direction. Finally, the beamforming antenna has four beamforming angles, and to verify the performance for an indoor location tracking application of impulse-radio ultra-wideband radar, it was connected to an NVA-R661 module.

scholarly journals Dual-Polarized Dual-Loop Double-Slot Antipodal Tapered Slot Antenna for Ultra-Wideband Radar Applications

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1377
Author(s):  
Guangyao Yang ◽  
Shengbo Ye ◽  
Feng Zhang ◽  
Yicai Ji ◽  
Xiaojuan Zhang ◽  
...  
Keyword(s):  
Low Frequency ◽  
High Gain ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Loop Structure ◽  
Cross Polarization ◽  
Dual Polarized ◽  
Wideband Radar ◽  
Better Than

The miniaturized high-gain antenna is required in portable, ultra-wideband radar systems. However, the miniaturization, ultra-wideband and high gain often restrict each other in the antenna design. In this paper, a dual-polarized, double-slot, antipodal tapered slot antenna with a double-layer, dual-loop structure and novel slot edges is presented. The proposed magnetic dual-loop structure has the capacity to reduce the low cut-off frequency of the double-slot tapered slot antenna by weakening the resonance and coupling. In addition, the high gain, low sidelobe level (SLL), and low cross-polarization level are achieved in the boresight direction. A novel gradient slot profile is designed to improve the low-frequency directivity of the tapered slot antenna without affecting the matching. To feed the antenna elements, a kind of wideband, balun-divider structure is designed. The dual-polarized antenna is combined by two orthogonal elements in a cross configuration without galvanic contact or influence to performance. The measured results show that the impedance bandwidth of the proposed antenna is 0.6~4 GHz, and the maximum gain is 11 dBi. The isolation between the two antenna ports is better than 32 dB, and the cross-polarization discrimination (XPD) is better than 20 dB.

scholarly journals Reconfigurable 2×1 CPW-Fed Rectangular Slot Antenna Array (RSAA) Based on Graphene for Wireless Communications

2021 ◽  
Vol 36 (6) ◽  
pp. 788-795
Author(s):  
Dalia Elsheakh ◽  
Osama Dardeer
Keyword(s):  
Wireless Communications ◽  
Antenna Array ◽  
Coplanar Waveguide ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Average Gain ◽  
Rectangular Slot ◽  
High Data ◽  
Peak Gain

This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a modified circular slot shape to support a high data rate for wireless communications applications. The proposed antenna array dimensions are 0.7λ×0.8λo×0.064λo at the resonant frequency 1.8 GHz. It is fabricated on Rogers RO4003 substrate and fed by using a coplanar waveguide (CPW). A graphene layer is added on one side of the substrate to realize frequency reconfigurability and improve the array gain. The proposed array acquires -10 dB impedance bandwidth of the RSAA that extends from 1.7 GHz to 2.6 GHz, from 3.2 to 3.8 GHz, and from 5.2 GHz to 7 GHz. The proposed array achieved a realized peak gain of 7.5 dBi at 6.5 GHz at 0 Volt bias with an average gain of 4.5 dBi over the operating band. When the graphene bias is increased to 20 Volt, the antenna bandwidth extends from 1 GHz to 4 GHz and from 5 to 7 GHz with a peak gain of 14 dBi at 3.5 GHz and an average gain of 7.5 dBi. The linearly polarized operation of the proposed array over the operating bands makes it suitable for short-range wireless communications .

scholarly journals Wideband Printed Antenna Design Using a Shape Blending Algorithm

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Aiting Wu ◽  
Zhonghai Zhang ◽  
Boran Guan
Keyword(s):  
Optimization Method ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Printed Antenna ◽  
Rectangular Slot ◽  
Design And Optimization ◽  
Shape Blending ◽  
The Impact ◽  
Good Agreement

The shape of the tuning stub of the wide slot printed antenna is an important factor which affects the antenna’s performances. In this paper, a new design and optimization method of wideband printed slot antenna using a shape blending algorithm is presented. The proposed antenna consists of a wide rectangular slot and a tuning stub, whose profile is formed by the shape blending outcome from a pie and a diamond shape. The method is used to design an ultra-wideband antenna. The impact on the impedance bandwidth through the antenna geometry change with the different shape blending results has been investigated and analyzed. To verify the proposed design, the antenna prototype was designed, fabricated, and measured. The measured results are compared with the simulation and show good agreement.

scholarly journals Dual Port Antenna Combining Sensing and Communication Tasks for Cognitive Radio

2016 ◽  
Vol 62 (2) ◽  
pp. 121-127 ◽  
Author(s):  
Hamza Nachouane ◽  
Abdellah Najid ◽  
Abdelwahed Tribak ◽  
Fatima Riouch
Keyword(s):  
Cognitive Radio ◽  
Dynamic Spectrum Access ◽  
Antenna System ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Manufacturing Cost ◽  
Communication Task ◽  
Wide Range ◽  
Radio Technology ◽  
Radio Systems

Abstract Dynamic spectrum access has been proposed as the effective solution to overcome the spectrum scarcity issue, supported by cognitive radio technology. Sensing and communication functions are both the most important tasks in cognitive radio systems. In this paper, an antenna system combining sensing and communication tasks is proposed to be integrated into cognitive radio front-ends. The sensing task is performed by means of an ultra-wideband quasi-omnidirectional antenna. Whilst the communication task is ensured by using a narrowband antenna. Both antennas have been designed on the same layer of an FR4 substrate, for manufacturing cost constraint. Therefore, the isolation between them must take into consideration. The measured mutual coupling of less than -18 dB is achieved over the whole impedance bandwidth. The proposed sensing antenna covers a wide range frequency bands ranging from 2 to 5.5 GHz. While the communication antenna operates at 2.8 GHz, and by adding inductors to the antenna, the resonant frequency can be tuned from 2.6 to 2.7 GHz. The whole antenna system was designed, fabricated, and tested. Measurement and simulation results prove the feasibility of the proposed structure for cognitive radio applications.

A Simple Ultra-Wideband Magneto-Electric Dipole Antenna With High Gain

Frequenz ◽  
2017 ◽  
Vol 72 (1-2) ◽  
Author(s):  
Chen-yang Shuai ◽  
Guang-ming Wang
Keyword(s):  
Electric Dipole ◽  
Simple Structure ◽  
High Gain ◽  
Dipole Antenna ◽  
Ultra Wideband ◽  
Main Beam ◽  
Impedance Bandwidth ◽  
Practical Applications ◽  
Measurement Results ◽  
Feeding Structure

AbstractA simple ultra-wideband magneto-electric dipole antenna utilizing a differential-fed structure is designed. The antenna mainly comprises three parts, including a novel circular horned reflector, two vertical semicircular shorted patches as a magnetic dipole, and a horizontal U-shaped semicircular electric dipole. A differential feeding structure working as a perfect balun excites the designed antenna. The results of simulation have a good match with the ones of measurement. Results indicate that the designed antenna achieves a wide frequency bandwidth of 107 % which is 3.19~10.61 GHz, when VSWR is below 2. Via introducing the circular horned reflector, the designed antenna attains a steady and high gain of 12±1.5dBi. Moreover, settled broadside direction main beam, high front-to-back ratio, low cross polarization, and the symmetrical and relatively stable radiation patterns in the E-and H-plane are gotten in the impedance bandwidth range. In the practical applications, the proposed antenna that is dc grounded and has a simple structure satisfies the requirement of many outdoor antennas.

scholarly journals Cross-Slot Antenna with U-Shaped Tuning Stub for Ultra-Wideband Applications

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Dawood Seyed Javan ◽  
Mohammad Ali Salari ◽  
Omid Hashemi Ghoochani
Keyword(s):  
Radiation Pattern ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Design Procedures ◽  
Linearly Polarized ◽  
Dimensional Parameters ◽  
Simulation Results ◽  
Novel Design ◽  
Better Than

A novel design of an ultra-wideband (UWB) slot antenna is presented. This antenna operates as a transmitter and receiver antenna. Effects of the antenna dimensional parameters are studied through experimental and simulation results. Design procedures are developed and verified for different frequency bands. The experimental and simulation results exhibit good impedance bandwidth, radiation pattern, and relatively constant gain over the entire band of frequency. Antenna gain and directivity at boresight and in their maximum states are close to each other and indicate high radiation efficiency. To use the antenna as a linearly polarized antenna, the radiation pattern in E-plane is better thanthat inH-plane.

An UWB dual polarized microstrip fed L-shape slot antenna

2015 ◽  
Vol 8 (2) ◽  
pp. 363-368 ◽  
Author(s):  
Raghupatruni Venkatsiva Ram Krishna ◽  
Raj Kumar ◽  
Nagendra Kushwaha
Keyword(s):  
Electric Fields ◽  
High Performance ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Area Network ◽  
Dual Polarized

In this paper, a microstrip fed, L-shape slot antenna for dual polarization is proposed. The two arms of the slot generate electric fields of orthogonal polarizations. By properly sectioning the slot and the feed line, ultra wideband (UWB) behavior is obtained. The measured impedance bandwidth (S11< −10 dB) is more than 8.6 GHz (112%) and 8.2 GHz (104%) for Port 1 and Port 2, respectively. The measured isolation is better than 25 dB over most of the band. The aperture field distribution justifies the dual polarized nature. A modified version which implements a band-notch over 5.1–5.85 GHz wireless local area network (WLAN) band is also presented. With a compact, single substrate design, the antenna can be useful in MIMO transmission systems, polarimetric UWB radar, high performance microwave imaging, and other future wireless communications devices.

A CPW-fed stepped slot UWB antenna for MIMO/diversity applications

2015 ◽  
Vol 9 (1) ◽  
pp. 151-162 ◽  
Author(s):  
Raj Kumar ◽  
Neha Pazare
Keyword(s):  
Coplanar Waveguide ◽  
Impedance Matching ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Uwb Antenna ◽  
Slot Antennas ◽  
Capacity Loss ◽  
Field Radiation

An ultra-wideband (UWB) slot antenna for diversity applications is introduced. The overall structure of the antenna consists of two similar coplanar waveguide (CPW)-fed stepped rectangular slots placed in an orthogonal position. The slots are asymmetric with respect to their placement in the ground plane. The CPW feeds are double stepped and terminated on hexagonal patches for better impedance matching. A wide impedance bandwidth (measured) from 3 to 12 GHz with an isolation better than 15 dB is obtained with this antenna. To improve the isolation, the design is modified and an I-shaped slot strip is introduced between the two slot antennas. With this, the isolation is brought about 25 dB of most of the band, while the impedance bandwidth remains the same (2.8–12 GHz for port 1, measured and 2.9–12 GHz for port 2, measured). The far-field radiation patterns are also measured and a peak gain of about 5 dBi is obtained. Finally, the diversity parameters such as envelope correlation coefficient and capacity loss are calculated and found to have low values. The antenna is expected to be useful for UWB diversity applications with good isolation.

scholarly journals Miniaturized Antipodal Vivaldi Antenna with Improved Bandwidth Using Exponential Strip Arms

Electronics ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 83
Author(s):  
Mohammad Mahdi Honari ◽  
Mohammad Saeid Ghaffarian ◽  
Rashid Mirzavand
Keyword(s):  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Lower Edge ◽  
Radiation Characteristics ◽  
Antenna Structure ◽  
Antenna Miniaturization ◽  
Vivaldi Antenna ◽  
Vivaldi Antennas ◽  
Peak Gain

In this paper, a miniaturized ultra-wideband antipodal tapered slot antenna with exponential strip arms is presented. Two exponential arms with designed equations are optimized to reduce the lower edge cut-off frequency of the impedance bandwidth from 1480 MHz to 720 MHz, resulting in antenna miniaturization by 51%. This approach also improves antenna bandwidth without compromising the radiation characteristics. The dimension of the proposed antenna structure including the feeding line and transition is 158 × 125 × 1 mm3. The results show that a peak gain more than 1 dBi is achieved all over the impedance bandwidth (0.72–17 GHz), which is an improvement to what have been reported for antipodal tapered slot and Vivaldi antennas with similar size.

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