scholarly journals Pattern Reconfigurable Antenna for VANET, Wi-Fi, and WiMAX Wireless Communication Systems

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Rahmani Faouzi ◽  
Amar Touhami Naima ◽  
BelbachirKchairi Abdelmounaim ◽  
Aknin Noura ◽  
Taher Nihade
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Equivalent Circuit Model ◽  
Coaxial Cable ◽  
Wireless Communication Systems ◽  
Reconfigurable Antenna ◽  
Antenna Characteristic ◽  
Beam Switching ◽  
Theoretical Results ◽  
Good Agreement

This work presents the design and analysis of a beam switching antenna for VANET, Wi-Fi, and WiMAX wireless communication systems. The proposed reconfigurable antenna is powered by a coaxial cable and consists of a circular patch, six fish-shaped radiating elements, and a circular planar ground. The antenna was constructed on a Rogers RT5880 substrate. Its dimensions are as follows: 0.81λ0 × 0.81λ0 × 0.03λ0. It performs six reconfigurable operating states, at the same frequency, by controlling the activation and deactivation of six PIN diodes to change the beam’s direction. A theoretical equivalent circuit model of the antenna is extracted. A progressive analysis of improving the antenna characteristic performances is provided. The bandwidth of the proposed antenna is 9.07% (measured), 9.62% (simulated), and 9.31% (theoretical). The designed antenna has a maximum gain of 9.57 dB for all pattern states and a superior efficiency ratio from 85% to 95% over the operating range (5.54 GHz–6.10 GHz). The proposed reconfigurable antenna is fabricated. Measured, simulated, and theoretical results are given and show good agreement, including reflection coefficient (S11) and radiation patterns.

scholarly journals Frequency Reconfigurable Antenna Array Using Defected Ground Structure for Outdoor Wireless Communication Systems

2019 ◽  
Vol 9 (1) ◽  
pp. 33
Author(s):  
Mohd Aziz Aris ◽  
Mohd Tarmizi Ali ◽  
Nurulhuda Abd Rahman ◽  
Idnin Pasya Ibrahim
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Array Antenna ◽  
Wireless Communication Systems ◽  
Reconfigurable Antenna ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Resonant Frequencies ◽  
Frequency Reconfigurable Antenna ◽  
Good Agreement

This paper proposes frequency reconfigurable antenna for outdoor wireless communication systems, the 4 x 4 array antenna has designed at two resonant frequencies 7.5 GHz and 8.85 GHz. The periodic dumbbell geometry etched on the ground layer newly proposed with dual functionality, to control desired frequency and to couple radiating patches at the top substrate with feeding line at the bottom substrate. The reconfigurability of the patch antenna is controlled by utilizing the copper pad of the feeding network with OPEN and SHORT states. The reconfigurable antenna has been simulated and optimized using Computer Simulation Technology (CST) to get the desired responds. The good agreement between simulation and measured results indicates that the frequency reconfigurable patch array antenna using Periodic Dumbbell Slotted Aperture Structure (FRPDSA) is feasible to support outdoor wireless communication systems.

scholarly journals Frequency and Pattern Reconfigurable Antenna for Emerging Wireless Communication Systems

Electronics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 407 ◽  
Author(s):  
Amjad Iqbal ◽  
Amor Smida ◽  
Nazih Mallat ◽  
Ridha Ghayoula ◽  
Issa Elfergani ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Wireless Communication Systems ◽  
Reconfigurable Antenna ◽  
Minimal Size ◽  
Beam Switching ◽  
Frequency Shifting

A printed and minimal size antenna having the functionality of frequency shifting as well as pattern reconfigurability is presented in this work. The antenna proposed in this work consists of three switches. Switch 1 is a lumped switch that controls the operating bands of the antenna. Switch 2 and Switch 3 controls the beam switching of the antenna. When the Switch 1 is ON, the proposed antenna operates at 3.1 GHz and 6.8 GHz, covering the 2.5–4.2 GHz and 6.2–7.4 GHz bands, respectively. When Switch 1 is OFF, the antenna operates only at 3.1 GHz covering the 2.5–4.2 GHz band. The desired beam from the antenna can be obtained by adjusting the ON and OFF states of Switches 2 and 3. Unique beams can be obtained by different combination of ON and OFF states of the Switches 2 and 3. A gain greater than 3.7 dBi is obtained for all four cases.

scholarly journals Three-Dimensional MIMO Channel Model with High-Mobility Wireless Communication Systems Using Leaky Coaxial Cable in Rectangular Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Kai Zhang ◽  
Fangqi Zhang ◽  
Guoxin Zheng ◽  
Lei Cang
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Channel Model ◽  
Mimo System ◽  
Three Dimensional ◽  
High Mobility ◽  
Coaxial Cable ◽  
Mimo Channel ◽  
Wireless Communication Systems ◽  
Rectangular Tunnel

With the rapid development of high-mobility wireless communication systems, e.g., high-speed train (HST) and metro wireless communication systems, more and more attention has been paid to the wireless communication technology in tunnel-like scenarios. In this paper, we propose a three-dimensional (3D) nonstationary multiple-input multiple-output (MIMO) channel model with high-mobility wireless communication systems using leaky coaxial cable (LCX) inside a rectangular tunnel over the 1.8 GHz band. Taking into account single-bounce scattering under line-of-sight (LoS) and non-line-of-sight (NLoS) propagations condition, the analytical expressions of the channel impulse response (CIR) and temporal correlation function (T-CF) are derived. In the proposed channel model, it is assumed that a large number of scatterers are randomly distributed on the sidewall of the tunnel and the roof of the tunnel. We analyze the impact of various model parameters, including LCX spacing, time separation, movement velocity of Rx, and K-factor, on the T-CF of the MIMO channel model. For HST, the results of some further studies on the maximum speed of 360 km/h are given. By comparing the T-CF between the dipole MIMO system and the LCX-MIMO system, we can see that the performance of the LCX-MIMO system is better than that of the dipole MIMO system.

Design of ultra compact dual-band bandpass filter using L-shaped resonator

2017 ◽  
Vol 9 (3) ◽  
pp. 493-497 ◽  
Author(s):  
Yeganeh Pourasad ◽  
Gholamreza Karimi
Keyword(s):  
Communication Systems ◽  
Return Loss ◽  
Bandpass Filter ◽  
Local Area Networks ◽  
Equivalent Circuit Model ◽  
Local Area ◽  
Dual Band ◽  
Wireless Communication Systems ◽  
Operation Mechanism ◽  
Good Agreement

A compact dual-band microstrip bandpass filter (BPF) is presented for application at the frequencies 2.4 and 5.84 GHz. The proposed main resonator consists of two L-shaped resonators. To improve the upper-stopband of the proposed filter, modified U-Shaped resonators are accepted. The operation mechanism of the filter is investigated based on proffered equivalent-circuit model and transformation function. The sketched dual-band BPF attends the insertion loss less than 0.1 and 0.4 dB Also the return loss is 26 and 28 dB at 2.4 and 5.84, respectively. This proffered filter structure is proper for Bluetooth and wireless local area networks and other wireless communication systems. An overall good agreement between measured and simulated results is observed.

scholarly journals Frequency reconfigurable antennas for cognitive radio applications: a review

2019 ◽  
Vol 9 (5) ◽  
pp. 3542
Author(s):  
Ros Marie C Cleetus ◽  
Dr. G. Josemin Bala
Keyword(s):  
Cognitive Radio ◽  
Wireless Communication ◽  
Communication Systems ◽  
Cognitive Radios ◽  
Reconfigurable Antennas ◽  
Wireless Communication Systems ◽  
Frequency Pattern ◽  
Communication Services ◽  
Effective Utilization ◽  
Antenna Characteristic

<span>Wireless communication systems undergo tremendous growth these days and devices able to operate in a number of frequencybandsarehighlydemanded. Reconfiguration in antenna characteristic striggered the evolution of antennas that can workin multiple frequency, pattern<span> or polarization </span>environment.The frequency reconfigurable antennas thuse mergedarewell suited in Cognitive Radios which take part in the effective utilization of unused bands of frequencies by continuously interacting with the RF environment. Thus, Cognitive Radios enhancetheutilization of frequency spectrum and establish reliable communication. The most recent research works carried out in the arena of Frequency Reconfigurable Antennas for Cognitive Radio applications are reviewed and summed up in this paper to present the attributes and categorization. Four techniques adopted to attain frequency reconfiguration are extensively compared in this paper to find the advantages and constraints of each methodology. The applications of the works reviewed here are not only limited to Cognitive radios, but extended to a number of wireless communication services like, WLAN, WiMAX, etc</span>

Reconfigurable Antenna for Future Wireless Communication Systems

2007 ◽  
Vol 42 (3) ◽  
pp. 405-430 ◽  
Author(s):  
E. Del Re ◽  
S. Morosi ◽  
D. Marabissi ◽  
L. Mucchi ◽  
L. Pierucci ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Wireless Communication Systems ◽  
Reconfigurable Antenna

scholarly journals Triband Operation Enhancement Based on Multimode Analytics of Modified Rhombic Ring Structure with Fractal Ring Parasitic

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Chatree Mahatthanajatuphat ◽  
Thanakarn Suangun ◽  
Norakamon Wongsin ◽  
Prayoot Akkaraekthalin
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Ring Resonator ◽  
Bottom Layer ◽  
Ring Structure ◽  
Wireless Communication Systems ◽  
Resonant Frequencies ◽  
Antenna Size ◽  
Measurement Results ◽  
Good Agreement

This paper presents a triband operation enhancement based on multimode analytics of a monopole antenna designed by combining a rhombic ring radiator with a strip on a top layer and a fractal ring resonator placed at the bottom layer. The proposed antenna can achieve triband operation to support the modern wireless communication systems. The antenna size is approximately 36 × 52 mm2, which is quite compacted compared with the revised antenna. The simulation and measurement results are in good agreement. The antenna covers the operating bands at 22.22%, 9.8%, and 31.27% at the resonant frequencies of 1.8 GHz, 2.45 GHz, and 3.71 GHz, respectively, to support the application bands of LTE 1800, WLAN IEEE802.11b/g, WiMAX, and IMT Advanced Systems (5G). The average gain of the antenna is about 2 dBi. Also, the radiation patterns are omnidirectional for all operating frequencies.

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