New design method for low-loss Y-branch waveguides

2001 ◽  
Vol 19 (9) ◽  
pp. 1376-1384 ◽  
Author(s):  
T. Yabu ◽  
M. Geshiro ◽  
S. Sawa
Keyword(s):  
Design Method ◽  
Low Loss

A Low-Loss and High-Isolation Transformer-Based mm-Wave SPDT with Integrated Fan-out Wafer Level Packaging

2019 ◽  
Vol 29 (07) ◽  
pp. 2050115
Author(s):  
Xing Quan ◽  
Jiang Luo ◽  
Guodong Su ◽  
Kai Jing ◽  
Jinsong Zhan
Keyword(s):  
Design Method ◽  
Control Device ◽  
Secondary Coil ◽  
Cmos Process ◽  
Wafer Level ◽  
Low Loss ◽  
High Isolation ◽  
Wafer Level Packaging ◽  
Isolation Transformer ◽  
Better Than

This paper proposes a low-loss and high-isolation transformer (TF)-based mm-wave single-pole double-throw (SPDT) switch. The center-tapped technique is employed at the secondary coil of TF to improve isolation performance. The TF is implemented with the metals in redistribution layers (RDLs) in integrated fan-out (InFO) wafer level packaging technology to obtain low insertion loss (IL) and small chip size as the TF usually dominates the area of SPDT. The control device of the SPDT is realized in 40[Formula: see text]nm bulk CMOS process. The simulated result shows the proposed SPDT achieves a minimum IL of 1.34[Formula: see text]dB and the IL is less than 2.2[Formula: see text]dB at 24–31[Formula: see text]GHz. The isolations are better than 27[Formula: see text]dB between two double-throw ports and better than 20[Formula: see text]dB between single-pole and double-throw ports, respectively. The proposed SPDT has a compact silicon size of 220[Formula: see text][Formula: see text] (with PADs) and its return losses are better than [Formula: see text]9[Formula: see text]dB at 24–31[Formula: see text]GHz and. This work explores a new chip-package co-design method for the SPDT and may have some guidance for the co-design of SPDT and antenna in package (AiP).

scholarly journals Design of Tunable Equalizers Using Multilayered Half Mode Substrate Integrated Waveguide Structures Added Absorbing Pillars

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Shuxing Wang ◽  
Yongfei Wang ◽  
Dewei Zhang ◽  
Yi Zhang ◽  
Dongfang Zhou
Keyword(s):  
Multilayer Structure ◽  
Design Method ◽  
The Other ◽  
Mode Analysis ◽  
Substrate Integrated Waveguide ◽  
Low Loss ◽  
Resonant Cavities ◽  
Bottom Substrate ◽  
Compact Size ◽  
First Time

An equalizer based on multilayered half mode substrate integrated waveguide (HMSIW) structures with highQ-factor, low loss, and compact size is proposed for the first time. Resonant cavities distributing in the upper substrate and the bottom substrate, with the middle substrate layer which works as the transmission line together, constitute a multilayer structure. The design method and theoretical analysis are summarized first. The mode analysis, simulated results, and measured results are all provided. The measured results show a good performance and are in agreement with the simulated results, and the maximum attenuation slope reaches −16 dB over 12.5 GHz~14.5 GHz. With the use of absorbing pillars, the attenuation andQvalue can be tuned more easily than the other planar equalizers. Compared with the SIW equalizer, the size of this structure reduces by 50%. Furthermore, this structure is suitable for the miniaturization development of equalizers.

Design Method of Low Loss and Fast Response LC Filters Based on Locomotive Battery Testing System

EPE Journal ◽  
2008 ◽  
Vol 18 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Li Heming ◽  
Zhang Lixia ◽  
Yan Xiangwu ◽  
Kang Wei
Keyword(s):  
Design Method ◽  
Fast Response ◽  
Testing System ◽  
Low Loss ◽  
Lc Filters

scholarly journals A Compact Multi-Frequency Circular Patch Antenna Embedded with Metamaterial Resonators

2020 ◽  
Vol 8 (6) ◽  
pp. 3008-3012
Keyword(s):  
Patch Antenna ◽  
Performance Enhancement ◽  
Design Method ◽  
Ground Plane ◽  
Low Loss ◽  
Circular Patch ◽  
Measurement Results ◽  
Circular Patch Antenna ◽  
Novel Method ◽  
Working Frequency

In this paper, a novel method to achieve tri-band performance for both reduced and conventional size circular microstrip patch antenna (CPA) loaded with low loss metamaterial unit cell is presented. The proposed tri-band CPA is based on metamaterial structure called complementary skewed omega type resonator (CSOR). The conventional CPA operating with 5.1GHz loaded with a pair of symmetric CSORs on the ground plane excites three working frequencies. Beside miniaturization, this work mainly focuses on multiband operation with performance enhancement of the circular patch antenna Numerical simulation of the proposed antenna appears that the operating frequencies of each band can tune separately. Good matching and stable radiation pattern with a satisfactory gain is achieved in the working frequency band. A good concord between simulation and measurement results validate the design method.

scholarly journals Design of a Suspended Stripline Narrow Bandpass Filter with Ultrawideband Harmonic Suppression

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Ju Seong Park ◽  
Wahab Mohyuddin ◽  
Hyun Chul Choi ◽  
Kang Wook Kim
Keyword(s):  
Insertion Loss ◽  
High Performance ◽  
Bandpass Filter ◽  
Design Method ◽  
Characteristic Impedance ◽  
Wireless Systems ◽  
Bandpass Filters ◽  
Center Frequency ◽  
Harmonic Suppression ◽  
Low Loss

A design method of narrow bandpass filters (NBPFs) of 4–6% bandwidth with ultrawideband suppression of harmonic passbands, utilizing two cascaded step impedance resonators (SIRs) in a suspended stripline, is proposed in this paper. The proposed design utilized the characteristics of a suspended stripline, which provides a much higher characteristic impedance ratio as compared with that of the microstripline, enabling ultrawideband harmonic suppression. As an example of the NBPF, a filter with a passband center frequency f0 of 0.75 GHz and bandwidth of 5% was implemented and proved to suppress the harmonic passbands up to 13.5 f0. Since the proposed filter was implemented on the suspended stripline, the passband insertion loss was only −0.9 dB, which is low as compared with other previous designs. The proposed filter is a compact high-performance low-loss NBPF, which can be applicable to various wireless systems.

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.

Low-Loss Images in a Stem/Tem Microscope

1976 ◽  
Vol 34 ◽  
pp. 496-497 ◽  
Author(s):  
David C. Joy ◽  
Dennis M. Maher
Keyword(s):  
High Resolution ◽  
Surface Topography ◽  
Beam Direction ◽  
Low Loss ◽  
Specimen Holder ◽  
Glancing Angle ◽  
High Resolution Images ◽  
Set Up ◽  
Conventional Manner ◽  
Objective Type

High-resolution images of the surface topography of solid specimens can be obtained using the low-loss technique of Wells. If the specimen is placed inside a lens of the condenser/objective type, then it has been shown that the lens itself can be used to collect and filter the low-loss electrons. Since the probeforming lenses in TEM instruments fitted with scanning attachments are of this type, low-loss imaging should be possible.High-resolution, low-loss images have been obtained in a JEOL JEM 100B fitted with a scanning attachment and a thermal, fieldemission gun. No modifications were made to the instrument, but a wedge-shaped, specimen holder was made to fit the side-entry, goniometer stage. Thus the specimen is oriented initially at a glancing angle of about 30° to the beam direction. The instrument is set up in the conventional manner for STEM operation with all the lenses, including the projector, excited.

Edge Penetration Effects in the Low-Loss Electron Image in the SEM

1988 ◽  
Vol 46 ◽  
pp. 202-203
Author(s):  
Oliver C. Wells
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Beam Energy ◽  
Secondary Electron ◽  
Sharp Edge ◽  
Beam Diameter ◽  
Low Loss ◽  
Additional Information ◽  
Electron Image ◽  
Scanning Electron

The low-loss electron (LLE) image in the scanning electron microscope (SEM) is useful for the study of uncoated photoresist and some other poorly conducting specimens because it is less sensitive to specimen charging than is the secondary electron (SE) image. A second advantage can arise from a significant reduction in the width of the “penetration fringe” close to a sharp edge. Although both of these problems can also be solved by operating with a beam energy of about 1 keV, the LLE image has the advantage that it permits the use of a higher beam energy and therefore (for a given SEM) a smaller beam diameter. It is an additional attraction of the LLE image that it can be obtained simultaneously with the SE image, and this gives additional information in many cases. This paper shows the reduction in penetration effects given by the use of the LLE image.

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