scholarly journals Investigation on Symmetric and Asymmetric Broadband Low-Loss W-Band Pillbox Windows

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2060
Author(s):  
Tongbin Yang ◽  
Xiaotong Guan ◽  
Wenjie Fu ◽  
Dun Lu ◽  
Chaoyang Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Wide Band ◽  
Simulation Software ◽  
Experimental Results ◽  
Frequency Range ◽  
Low Loss ◽  
W Band ◽  
Measurement Results ◽  
Vacuum Electronic Devices ◽  
Wave Region

In order to develop wide-band low-loss windows for W-band vacuum electronic devices and easily fabricate them, symmetric and asymmetric pillbox windows are investigated and reported in this paper. A symmetric pillbox window and an asymmetric pillow-box window were designed, simulation optimized, fabricated, and tested. The initial parameters for the two pillbox windows were designed by equivalent circuit theory. Computer simulation technology (CST) three-dimensional (3D) electromagnetic simulation software was used to verify and optimize the design. Because of the uncontrollability of welding during the experiment, this article provides two solutions. One is to measure and reprocess the symmetrical pillbox window with the dielectric sheet welded to reduce the influence of welding on the measurement results; the other is an asymmetrical box window which is designed to avoid the error caused by the welding of the box window. The best experimental results for the symmetric pillbox window were |S21| close to 1 dB and reflection parameter |S11| close to 10 dB in the frequency range of 77–110 GHz. The experimental results for the asymmetric pillbox window were |S21| < 1 dB nearly in the frequency range of 76–109.5 GHz. The experimental results show that both solutions efficiently complete the design of broadband pillbox windows and would potentially be operated in the gigahertz millimeter-wave region.

scholarly journals Planar Offset Short Applicable to the Calibration of a Free-Space Material Measurement System in W-Band

2021 ◽  
Vol 21 (1) ◽  
pp. 51-59
Author(s):  
Jin-Seob Kang ◽  
Jeong-Hwan Kim
Keyword(s):  
Electrical Properties ◽  
Measurement System ◽  
Free Space ◽  
Physical Contact ◽  
Frequency Range ◽  
Electromagnetic Devices ◽  
W Band ◽  
Measurement Results ◽  
Properties Of Materials ◽  
Space Material

The electrical properties of materials and their dependence on frequency and temperature are indispensable in designing electromagnetic devices and systems in various areas of engineering and science for both basic and applied researches. A free-space transmission/reflection method measuring the free-space scattering parameters of a material under test (MUT) located at the middle of transmit/receive antennas in a free space is suitable for non-destructively testing the MUT without prior machining or physical contact in high-frequency range. This paper describes a planar offset short applicable to the calibration of a quasi-optic based free-space material measurement system in the millimeter-wave frequency range. The measurement results of the dimensional and electrical properties for the three fabricated planar offset shorts with the phase difference of 120° between the reflection coefficients of the planar shorts in the W-band (75–110 GHz) are presented.

Wide Band Antenna with Ultra-smooth Spectral Characteristics

2021 ◽  
Vol 35 (11) ◽  
pp. 1292-1293
Author(s):  
Agaram Raghunathan ◽  
B. Girish ◽  
R. Somashekar ◽  
K. Srivani ◽  
Saurabh Singh ◽  
...  
Keyword(s):  
Spectral Characteristics ◽  
Wide Band ◽  
Antenna Design ◽  
Observational Cosmology ◽  
Spectral Signature ◽  
Spectral Features ◽  
Surface Currents ◽  
Frequency Range ◽  
Measurement Results ◽  
Frequency Independent

Understanding the evolution of Universe is, in the forefront of, the modern day observational cosmology. It requires precise and accurate measurement of cosmological signal, orders of magnitude weaker than the bright sky background. Detection of such a signal having distinct spectral signature, needs an antenna with frequency independent characteristics over more than an octave bandwidth. A spherical monopole antenna has been designed to operate in the frequency range 50-200 MHz with a spectral smoothness of about few parts in 104. The structure has been modeled and optimized using WIPL-D, to minimize spectral features arising out of abrupt reflections of surface currents and frequency dependent radiation patterns. A prototype has been built to validate the design. This paper presents the methodology adopted in the overall antenna design, experiences in its prototyping and simulation and the measurement results.

Experimental Testing and Finite Element Modeling of Bump Wafer Probing

2013 ◽  
Vol 284-287 ◽  
pp. 748-753
Author(s):  
Hao Yuan Chang ◽  
Kao Hua Chang ◽  
Yi Shao Lai
Keyword(s):  
Finite Element ◽  
Solder Bump ◽  
Experimental Testing ◽  
Three Dimensional ◽  
Element Model ◽  
Simulation Software ◽  
Experimental Results ◽  
Height Variation ◽  
Bump Height ◽  
Wafer Probing

The purpose of this paper is mainly to develop a method to simulate the bump height variation and probe mark profile for Eutectic (Sn63/ Pb37) bump wafer probing with continuing-touchdown probing. Certainly, the bump height variation and probe mark area on the solder bump influence the quality of the wafer probing and further impacts reliability of the packaging process after wafer probing to cause issues of cold-joint and needle damage. A three-dimensional computational model of was developed to analyze the contact phenomena between the vertical needle and the solder bump. Finite element simulation software, ANSYS, is used to analyze the loading force distributed on the vertical needle with various overdrives. In addition, the results of the bump height variation and probe mark area, which predicted by the finite element method (FEM), were verified against the on-line experimental results. Finally, the results predicted by the finite element model is consistent with experimental results and the numerical method presented in the paper can be used as a useful evaluating method to support the choice of suitable probe geometry and wafer probe testing parameters.

scholarly journals Application of the Symmetric Model to the Design Optimization of Fan Outlet Grills

Symmetry ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 959 ◽  
Author(s):  
Lin ◽  
Cheng
Keyword(s):  
Wind Speed ◽  
Flow Field ◽  
Velocity Distribution ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Surface Flow ◽  
Simulation Software ◽  
Experimental Results ◽  
Symmetric Model ◽  
Airflow Rate

In this study, different designs of the opening pattern of computer fan grills were investigated. The objective of this study was to propose a simulation analysis and compare it to the experimental results for a set of optimized fan designs. The FLUENT computational fluid dynamics (CFD) simulation software was used to analyze the fan blade flow. The experimental results obtained by the simulation analysis of the optimized fan designs were analyzed and compared. The effect of different opening pattern designs on the resulting airflow rate was investigated. Six types of fans with different grills were analyzed. The airflow velocity distribution in the simulated flow channel indicated that the wind speed efficiency of the fan and its influence were comparable with the experimental model. The air was forced by the fan into the air duct. The flow path was separately measured by analog instruments. The three-dimensional flow field was determined by performing a wind speed comparison on nine planes containing the mainstream velocity vector. Moreover, the three-dimensional curved surface flow field at the outlet position and the highest fan rotation speed were investigated. The air velocity distribution at the inlet and the outlet of the fan indicated that among the air outlet opening designs, the honeycomb shaped air outlet displayed the optimal performance by investigating the fan characteristics and the estimated wind speed efficiency. These optimized designs were the most ideal configurations to compare these results. The air flow rate was evenly distributed at the fan inlet.

scholarly journals Wide Band Parasitic Microstrip Antenna using Multiple Feedline for Mobile Communication

2019 ◽  
Vol 9 (1) ◽  
pp. 1887-1891
Keyword(s):  
Mobile Communication ◽  
Communication System ◽  
Microstrip Antenna ◽  
Return Loss ◽  
Wide Band ◽  
Frequency Range ◽  
Optimal Bandwidth ◽  
Feed Line ◽  
Measurement Results ◽  
Working Frequency

his paper proposes design of parasitic microstrip antenna with multiple feed line for mobile communication applications at range frequency of 1800 – 2100 MHz. The purpose of adding multiple feed line is to enhanced the bandwidth of the proposed antenna. The multiple feed line used has an impedance of 100 Ohm and is placed on the edge of the patch parasitic microstrip antenna. The optimal bandwidth of the microstrip antenna is obtained by adjusting the dimensions and position of the multiple feed line. From the measurement results obtained return loss of -14.91 dB, VSWR of 1.44 at working frequency of 1800 MHz and bandwidth of 427 MHz with a frequency range 1715 MHz - 2142 MHz. . From these results it can be concluded that the banwidth of proposed antenna has met the criteria to be used in a mobile communication system.

Design and development of wide band dual-polarized magneto electric dipole antenna for mobile communications

2019 ◽  
Vol 11 (2) ◽  
pp. 175-181 ◽  
Author(s):  
Lakshminarayana Pollayi ◽  
Rama Krishna Dasari ◽  
Vijay M. Pandharipande
Keyword(s):  
Wireless Communications ◽  
Mobile Communications ◽  
Electric Dipole ◽  
Wide Band ◽  
Dipole Antenna ◽  
Simulation Software ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
High Frequency Structure Simulator ◽  
Dual Polarized

AbstractA shorted magneto electric dipole with orthogonal dual polarization is designed for modern wireless communications. The proposed antenna is a wideband dual-polarized antenna consisting of magneto electric dipoles, which are fed by novel hook-shaped strip feeds. The antenna proposed in this paper is simulated using EM simulation software called high-frequency structure simulator. The simulated and measured results are presented. This antenna achieves 45.4% of impedance bandwidth of −10 dB RL for frequency range from 1.7 to 2.7 GHz. This frequency range covers the wireless communications applications like GSM 1800/1900, WCDMA, Bluetooth, Wi-Fi, etc.

scholarly journals Narrowband-to-Narrowband Frequency Reconfiguration with Harmonic Suppression Using Fractal Dipole Antenna

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
S. A. Hamzah ◽  
M. Esa ◽  
N. N. N. A. Malik ◽  
M. K. H. Ismail
Keyword(s):  
Dipole Antenna ◽  
Single Frequency ◽  
Harmonic Suppression ◽  
Frequency Range ◽  
Low Loss ◽  
Harmonic Frequency ◽  
Radiating Element ◽  
Measurement Results ◽  
Specific Frequency ◽  
Original Size

Harmonic suppressed fractal antenna with switches named TMFDB25 is developed to select desired frequency band from 400 MHz to 3.5 GHz. The radiating element length is changed to tune the operating frequency while the stub is used to eliminate the undesired harmonic frequency. The balun circuit is reduced by 75% from the original size. The antenna is built on a low loss material. It has the ability to select a single frequency out of fifteen different bands and maintain the omnidirectional radiation pattern properties. Furthermore, the antenna is designed, built, and tested. Simulation and measurement results show that the antenna operates well at the specific frequency range. Therefore, the antenna is suitable to be used for switching frequencies in the band of TV, GSM900/1800, 3G, ISM 2.4 GHz, and above.

Design of W-band PIN Diode SPDT Switch with Low Loss

2021 ◽  
Vol 36 (7) ◽  
pp. 901-907
Author(s):  
Yun Jiang ◽  
Yuan Ye ◽  
Daotong Li ◽  
Zhaoyu Huang ◽  
Chao Wang ◽  
...  
Keyword(s):  
Design Method ◽  
Coplanar Waveguide ◽  
Plane Waveguide ◽  
Pin Diode ◽  
Frequency Range ◽  
Low Loss ◽  
High Frequency Structure Simulator ◽  
W Band ◽  
3D Simulation Model ◽  
Magnetic Field Coupling

A W-band PIN diode single pole double throw (SPDT) switch with low insertion loss (IL) was successfully developed using a hybrid integration circuit (HIC) of microstrip and coplanar waveguide (CPW) in this paper. In order to achieve low loss of the SPDT switch, the beam-lead PIN diode 3D simulation model was accurately established in Ansys High Frequency Structure Simulator (HFSS) and the W-band H-plane waveguide-microstrip transition was realized based on the principle of the magnetic field coupling. The key of the proposed method is to design the H-plane waveguide-microstrip transition, it not only realizes the low IL of the SPDT switch, but also the direct current (DC) bias of the PIN diode can be better grounded. In order to validate the proposed design method, a W-band PIN diode SPDT switch is fabricated and measured. The measurement results show that the IL of the SPDT switch is less than 2 dB in the frequency range of 85 to 95 GHz, while the isolation of the SPDT switch is greater than 15 dB in the frequency range of 89.5 to 94 GHz. In the frequency range of 92 to 93 GHz, the IL of the SPDT switch is less than 1.65 dB, and its isolation is higher than 22 dB. Switch rise time and switch fall time of the SPDT switch are smaller than 29ns and 19ns, respectively. Good agreement between the simulations and measurements validates the design method.

Wide band via-less transition from FG-CBCPW to microstrip

2011 ◽  
Vol 3 (6) ◽  
pp. 675-677
Author(s):  
Kamaljeet Singh ◽  
Kunapareddy Nagachenchaiah
Keyword(s):  
Insertion Loss ◽  
Wide Band ◽  
Alumina Substrate ◽  
Silicon Substrates ◽  
Frequency Range ◽  
Low Loss ◽  
Design Procedures ◽  
Comparison Of The Results ◽  
Wideband Transition

A novel wideband transition from finite ground-conductor backed-CPW (FG-CB-CPW) to microstrip has been demonstrated in 8–23 GHz band. Proposed transition provides a very low-loss alterative to microstrip/coplanar lines at higher frequencies. Simulated results are detailed for both alumina and silicon substrates. Simulated results are validated on alumina substrate providing more than 100% bandwidth with maximum insertion loss of around 1.5 dB in the targeted frequency range. Comparison of the results along with design procedures is detailed in this article.

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