scholarly journals Compact Configuration Ultra-Wideband Microwave Filter Using Quarter-Wave Length Short-Circuited Stub

2007 ◽  
Author(s):  
Mohammad Shahrazel Razalli ◽  
Alyani Ismail ◽  
Mohd Adzir Mahd ◽  
Mohd Nizar Hamidon
Keyword(s):  
Wave Length ◽  
Ultra Wideband ◽  
Microwave Filter ◽  
Quarter Wave

scholarly journals Compact ultra-wide band microwave filter utilizing quarter-wave length short-circuited stubs with reduced number of vias

2009 ◽  
Vol 51 (9) ◽  
pp. 2116-2119 ◽  
Author(s):  
Mohammad Shahrazel Razalli ◽  
Alyani Ismail ◽  
Mohd Adzir Mahdi ◽  
Mohd Nizar Hamidon
Keyword(s):  
Wave Length ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Microwave Filter ◽  
Quarter Wave

An LTCC Based Filter and Front End Module using Heterogeneous Dielectrics

2006 ◽  
Vol 3 (3) ◽  
pp. 129-135 ◽  
Author(s):  
Jun Chul Kim ◽  
Dongsu Kim ◽  
Hyun Min Cho ◽  
Jong Chul Park ◽  
Nam Kee Kang
Keyword(s):  
Power Amplifier ◽  
Bandpass Filter ◽  
Wave Length ◽  
Signal Delay ◽  
Ceramic Substrates ◽  
Front End ◽  
Quarter Wave ◽  
Front End Module ◽  
Signal Delay Time ◽  
Shunt Capacitor

This paper presents a multi-layered bandpass filter (BPF) and a power amplifier module (PAM) integrated with a SAW duplexer based on heterogeneous ceramic substrates. The heterogeneous substrates are composed of two different ceramic layers with εr = 7.4 and 17.5 in order to take advantage of their own properties. In the PAM substrate, a DC blocking capacitor and a shunt capacitor for an output matching network of a power amplifier are embedded with a material of εr = 17.5 to reduce occupied areas of the capacitors. On the other hand, a quarter-wave-length stripline and RF chokes are realized with a material of εr = 7.4 to reduce signal delay time. In the multi-layered BPF, a coupled stripline and a high shunt capacitor are embedded with materials of εr = 7.4 and 17.5, respectively, resulting in improved spurious characteristics.

A High Power, GaN, Quarter-Wave Length Switch for X-Band Applications

2018 ◽  
Author(s):  
Onur Memioglu ◽  
Duygu Isinsu Turan ◽  
Fatih Kocer ◽  
Ozlem Aydin Civi
Keyword(s):  
High Power ◽  
Wave Length ◽  
X Band ◽  
Quarter Wave

Non-quarter-wave-length matching transformer

2014 ◽  
Vol 57 (7) ◽  
pp. 328-330
Author(s):  
V. Bieliavtsev ◽  
V. Pryimak ◽  
A. Markus
Keyword(s):  
Wave Length ◽  
Quarter Wave ◽  
Matching Transformer

Millimeter-wave coplanar stripline power dividers

2013 ◽  
Vol 5 (3) ◽  
pp. 205-212 ◽  
Author(s):  
Chong Li ◽  
Lai Bun Lok ◽  
Ata Khalid ◽  
Vasileios Papageorgiou ◽  
James Grant ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Transmission Lines ◽  
Integrated Circuit ◽  
Wave Length ◽  
Three Dimensional ◽  
Ultra Wideband ◽  
Main Body ◽  
Phase Inverter ◽  
Power Dividers ◽  
Consistent Performance

We present the design, fabrication, and measurement of a 2-way modified Wilkinson divider constructed in a coplanar geometry exhibiting ultra wideband isolation, transmission, and port matching in the millimeter-wave frequency range. The proposed divider replaces the lumped resistor in the conventional Wilkinson divider with two quarter-wave length transmission lines, a phase inverter, and two 2Z0 resistors. Except for the three ports that are coplanar waveguides (CPWs), the main body of the divider uses coplanar striplines (CPS). The phase inverter is realized using a simple airbridge-based crossover which is compatible with a modern monolithic microwave integrated circuit process. The divider has a ring-like configuration fabricated on a 620 µm thick semi-insulating GaAs wafer using electron beam lithography (EBL) technology. Three-dimensional (3D) full-wave electromagnetic simulations have been carried out to optimize the design and investigate the possible effect of fabrication tolerance on the performance of the crossover and the divider. Two dividers working at center frequencies of 25 and 80 GHz have been designed, fabricated, and tested. They all show consistent performance in terms of bandwidth, isolation, and port matching. Experimental and simulation results are in excellent agreement.

A Pump Instability Theory Using an Acoustic Feedback Mechanism

1994 ◽  
Author(s):  
James E. Corley
Keyword(s):  
Time Delay ◽  
Wave Length ◽  
Water Injection ◽  
Feedback Mechanism ◽  
Piping System ◽  
Injection Pump ◽  
Instability Theory ◽  
Quarter Wave ◽  
Path Lengths ◽  
Large Water

A subsynchronous vibration problem with a large water injection pump was solved in 1974 by modifying the discharge piping transition to a long taper configuration. This paper describes a quantitative theory based upon the dynamic modeling of the pump rotor and piping system. The mode] successfully duplicates the experimental results of the pump instability and reproduces the subsynchronous vibration described in the original paper. The analysis results in a log decrement of the system that is dependent upon the time delay of the acoustic pulsation. It shows that the system can be driven unstable for acoustic path lengths that are much less than the quarter wave length. The analysis also shows the log decrement is minimized when the time delay is equivalent to exactly that of an eighth wave length of the resonant frequency of the pump.

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