scholarly journals Compact Dual-Band Coupler for Vehicular Beam-Forming Array

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Dakui Wu ◽  
Guoxin Zheng
Keyword(s):  
Short Range ◽  
3D Model ◽  
Design Method ◽  
Dual Band ◽  
Operating Frequency ◽  
Beam Forming ◽  
Final Size ◽  
Dedicated Short Range Communications ◽  
Ansoft Hfss ◽  
First Time

A novel kind of compact dual-band quadrature patch coupler for vehicular beam-forming array is proposed for the first time in this paper. To keep the performance of the first operating frequency 2.4 GHz (for Bluetooth Low Energy (BLE)) and generate the second operating frequency 5.9 GHz (for Dedicated Short Range Communications (DSRC)) simultaneously, complementary triangular split resonant rings (CTSRRs) and splitting gaps are employed to improve the performance of this new coupler; final size of the proposed coupler is 0.24λg (for 2.4 GHz). To validate the performance and design method of the coupler this paper proposed, a 3D model is constructed and optimized with ANSOFT HFSS firstly and then a coupler prototype is fabricated and measured. The measured results show that the amplitude unbalance (AU) is 0.54 dB and 0.44 dB for 2.4 GHz and 5.9 GHz, respectively, and the corresponding phase unbalance (PU) is 93.5 and 92 degrees, respectively.

Experimental and numerical investigations on novel models for mechanical behaviors of the elastic ring in aero-engine

2021 ◽  
pp. 095440622110130
Author(s):  
Zhong Luo ◽  
Lei Li ◽  
Yang Yang ◽  
Xiaojie Hou ◽  
Jiaxi Liu ◽  
...  
Keyword(s):  
3D Model ◽  
Maximum Stress ◽  
Simple Structure ◽  
Experimental Testing ◽  
Axial Direction ◽  
Elastic Ring ◽  
Load Range ◽  
Aero Engine ◽  
Stiffness Characteristics ◽  
First Time

The elastic ring is widely used in elastic support structures of aero-engine because of its simple structure and convenient manufacturing. In this paper, two elastic ring models, 3D and 2D models, are proposed, where the fillets between the bulges and ring are considered. The 2D model is more efficient for the calculation of stiffness characteristics. The 3D model can be used to obtain the maximum stress position in the axial direction. Then the experimental testing is carried out to verify the accuracy and effectiveness of the proposed models. Based on the proposed models, the stiffness nonlinearity and critical load of the elastic ring are found for the first time, which can be used to determine the normal working load range. Moreover, the elastic ring models with and without fillets are developed, and the effect of the fillets on stress is discussed. The results show that the stress is reduced by considering the fillets, which are not considered in the existing literature.

scholarly journals Design and Realization of a Frequency Reconfigurable Antenna with Wide, Dual, and Single-Band Operations for Compact Sized Wireless Applications

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1321
Author(s):  
Wahaj Abbas Awan ◽  
Syeda Iffat Naqvi ◽  
Wael Abd Ellatif Ali ◽  
Niamat Hussain ◽  
Amjad Iqbal ◽  
...  
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Single Band ◽  
Dual Band ◽  
Operating Frequency ◽  
Reconfigurable Antenna ◽  
Area Network ◽  
Wireless Applications ◽  
Operating Modes ◽  
Compact Size

This paper presents a compact and simple reconfigurable antenna with wide-band, dual-band, and single-band operating modes. Initially, a co-planar waveguide-fed triangular monopole antenna is obtained with a wide operational frequency band ranging from 4.0 GHz to 7.8 GHz. Then, two additional stubs are connected to the triangular monopole through two p-i-n diodes. By electrically switching these p-i-n diodes ON and OFF, different operating frequency bands can be attained. When turning ON only one diode, the antenna offers dual-band operations of 3.3–4.2 GHz and 5.8–7.2 GHz. Meanwhile, the antenna with single-band operation from 3.3 GHz to 4.2 GHz can be realized when both of the p-i-n diodes are switched to ON states. The proposed compact size antenna with dimensions of 0.27λ0 × 0.16λ0 × 0.017λ0 at the lower operating frequency (3.3 GHz) can be used for several wireless applications such as worldwide interoperability for microwave access (WiMAX), wireless access in the vehicular environment (WAVE), and wireless local area network (WLAN). A comparative analysis with state-of-the-art works exhibits that the presented design possesses advantages of compact size and multiple operating modes.

scholarly journals High-Efficiency Polarizer Reflectarray Antennas for Data Transmission Links from a CubeSat

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1802
Author(s):  
Eduardo Martinez-de-Rioja ◽  
Daniel Martinez-de-Rioja ◽  
Rafael López-Sáez ◽  
Ignacio Linares ◽  
Jose A. Encinar
Keyword(s):  
Circular Polarization ◽  
Data Transmission ◽  
High Efficiency ◽  
High Gain ◽  
Dual Band ◽  
Left Handed ◽  
Linearly Polarized ◽  
Flat Profile ◽  
First Time ◽  
Collimated Beam

This paper presents two designs of high-efficiency polarizer reflectarray antennas able to generate a collimated beam in dual-circular polarization using a linearly polarized feed, with application to high-gain antennas for data transmission links from a Cubesat. First, an 18 cm × 18 cm polarizer reflectarray operating in the 17.2–22.7 GHz band has been designed, fabricated, and tested. The measurements of the prototype show an aperture efficiency of 52.7% for right-handed circular polarization (RHCP) and 57.3% for left-handed circular polarization (LHCP), both values higher than those previously reported in related works. Then, a dual-band polarizer reflectarray is presented for the first time, which operates in dual-CP in the frequency bands of 20 GHz and 30 GHz. The proposed antenna technology enables a reduction of the complexity and cost of the feed chain to operate in dual-CP, as a linear-to-circular polarizer is no longer required. This property, combined with the lightweight, flat profile and low fabrication cost of printed reflectarrays, makes the proposed antennas good candidates for Cubesat applications.

Reconfigurable Frequency Textile Antenna with Circular Polarization Using Slotted Technique

2015 ◽  
Vol 781 ◽  
pp. 81-84 ◽  
Author(s):  
Shakhirul Mat Salleh ◽  
Muzammil Jusoh ◽  
Abdul Hafiizh Ismail ◽  
Muhammad Ramlee Kamarudin ◽  
Mohamad Imran Ahmad ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Axial Ratio ◽  
Dual Band ◽  
Operating Frequency ◽  
Pin Diode ◽  
Switching Element ◽  
Band Frequency ◽  
Microstrip Patch ◽  
Textile Antenna

This paper presents a reconfigurable frequency microstrip patch textile antenna using slotted technique. The switchable frequency is achieved by implementing three PIN diode switches at the slotted ground of the antenna. It is discovered that the switching element is capable to configure the frequency at six different states of operating frequencies between 1.575 GHz until 2.45 GHz. With certain switches configuration, the antenna is proficient to produce a dual-band frequency of band 1; 1.575 GHz and 2.45 GHz and band 2; 1.588 GHz and 2.36 GHz. Besides, the antenna has successfully perform an axial ratio of less than <3 dB at the GPS operating frequency of 1.575 GHz. A shieldit super is used for the antenna radiator and felt fabric as the antenna substrate. The design and simulated result shows that the presented antenna is potential to be implemented in GPS and Wi-Fi applications.

Monolithic patch antenna for dedicated short‐range communications

2013 ◽  
Vol 49 (2) ◽  
pp. 85-86 ◽  
Author(s):  
O. Leonardi ◽  
M. Pavone ◽  
T. Cadili ◽  
G. Sorbello ◽  
T. Isernia
Keyword(s):  
Patch Antenna ◽  
Short Range ◽  
Dedicated Short Range Communications
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