30 Threads found on edaboard.com: Microstrip Open Stub
I found one paper and one book on this topics with this below title:
H. Atwater, ?The design of the Radial Line stub: A
Useful microstrip Circuit Element?, Microwave Journal,
November 1985, p. 149-156.
B. Wadell, ?Transmission Line Design Handbook?,
1991 Artech house Boston.London, p. 300-305.
but i have not none of the abow.
RF, Microwave, Antennas and Optics :: 26.11.2005 07:07 :: snmeciut :: Replies: 18 :: Views: 11500
thanks for answering,
we can use some simulate tools to caculate the is easy to simulate the microstrip,however,if the line is just single layer copper, what is the characteristic of the line?i think is not the same as a microstrip. when the length is far shorter than lamdar,it is a inductance,but i don
RF, Microwave, Antennas and Optics :: 19.09.2004 06:35 :: djalli :: Replies: 8 :: Views: 1060
I need to design a balun and I read the tutorial from
On the last page, an improved microstrip version (Figure 10) is given but no explaination.
Can anyone tell me why the value of L1 is different from L2? And where can I find the ralated paper? The circu
RF, Microwave, Antennas and Optics :: 25.12.2006 07:44 :: Athena :: Replies: 2 :: Views: 2276
I need to implement a resonator using a microstrip. I cannot use short circuited stubs. I thought of using an open circuited one but the performance is not good. Is there any other resonator that i can use.
One more thing is a 1nH inductor available for use at 12 GHz ?
RF, Microwave, Antennas and Optics :: 12.11.2008 12:47 :: steadymind :: Replies: 9 :: Views: 2035
Just for testing? You could use conducting silver paint, or cut a a thin sheet of copper and solder it the your line. I often used the second method (copper sheet) for experimental tuning of microstrip circuits.
RF, Microwave, Antennas and Optics :: 23.06.2010 04:24 :: volker_muehlhaus :: Replies: 4 :: Views: 571
If the impedance of a microstrip line is not the same with the one you designed (and getting a missmatch loss), there is an option to place some matching networks at its ends, and tune the circuit to compensate for the missmatch loss.
The problem that you get in this situation, the circuit becomes narrow band.
RF, Microwave, Antennas and Optics :: 06.03.2011 05:21 :: vfone :: Replies: 3 :: Views: 740
It seems we can buy coupler that made by strip line technology,not
What's the benefit ? lower loss & good directivity?
RF, Microwave, Antennas and Optics :: 11.07.2003 13:14 :: TQSU :: Replies: 6 :: Views: 2803
I am going to design a short range device at 868MHz, but i am not familiar with the antenna theory. Can anyone suggest which type of microstrip antennas is more suitbale? Loop antenna , open stub antenna or a slot antenna?
The major concern is the size of the antenna.
Best rgd :D
RF, Microwave, Antennas and Optics :: 27.10.2004 09:21 :: Mac7978 :: Replies: 5 :: Views: 2104
Looking to the layout of an X band VCO (tuning range 9.2GHz--9.5GHz) I have seen that the GaAs Fet was polarized in reverse mode. The +5Vdc power supply voltage was directly connected to the source terminal through a choke microstrip circuit. Along the Drain output line (rf output of VCO) a 82ohm resistor was series connected ( It ac
RF, Microwave, Antennas and Optics :: 04.11.2004 11:35 :: vinc57 :: Replies: 1 :: Views: 1318
In RF circuit design, using microstrip,
which gound methos is better?
(1) Use Via to ground; (layer 2 is ground layer)
(2) Use 1/4 of wavelength (open stub).
Please give a short explaination.
RF, Microwave, Antennas and Optics :: 22.09.2005 21:38 :: tony_taoyh :: Replies: 2 :: Views: 664
step1 : open the layout window
step2 : place the radial stub from microstrip library
step3 : open component properties , and activate the optimaztion for the desired varialble u want to optimimze
step 4 : from momentum drop down menu slect optimization
step 5 : spcify the goals of optimization
RF, Microwave, Antennas and Optics :: 30.05.2006 03:00 :: khouly :: Replies: 6 :: Views: 881
Hi all ,
I would like to know your opinion about output matching of power amplifier design.
I am designing a power amplifier and from 50 ohm I need to get short circuit at H2 and open circuit at H3 and at the same time I have to match my power amplifier to the optimal load impedance (28.8+j4.65) at the fundamental frequency at the current sour
RF, Microwave, Antennas and Optics :: 22.04.2008 05:15 :: jayce3390 :: Replies: 0 :: Views: 823
I'm doing the LNA design and now it gets down to the final step and I want to design all the discrete component into microstrip line, as the following circuit.
I got the L and C from muRata Semiconductor and synthesized the nonlinear model for these two components (as shown in plot)
I wonder how to design that in ML, quarter-wav
RF, Microwave, Antennas and Optics :: 13.10.2008 11:24 :: Sradio :: Replies: 4 :: Views: 5423
how the stub can make a dual band microstrip antenna?
what are the theory and mechanism?
RF, Microwave, Antennas and Optics :: 31.01.2009 01:57 :: sayma :: Replies: 2 :: Views: 911
replace a capacitor toward ground with a "open ended" stub and the inductor with a narrow microstrip; after that optimize the dimensions for better performances of the PA
Electromagnetic Design and Simulation :: 09.11.2009 09:15 :: Andrew77 :: Replies: 2 :: Views: 1205
BPF_Layout.jpg is a microstrip stub-line Filter...
Transversal_filter.jpg microstrip coupled resonator Filter...
RF, Microwave, Antennas and Optics :: 16.12.2009 23:23 :: Manjunatha_hv :: Replies: 3 :: Views: 1178
I'm using a microstrip quarter wave transformer with an open end connected to a short stub(part of impedance matching for a transistor).
As far as I know a wider microstrip(smaller Z0) for the transformer would result in better bandwidth. However I cannot understand why!
Can you help me with understanding the (...)
RF, Microwave, Antennas and Optics :: 11.08.2010 09:22 :: n3x :: Replies: 1 :: Views: 971
does anybody know for what reason the pads in the above picture are used ?
RF, Microwave, Antennas and Optics :: 29.03.2011 05:24 :: elektr0 :: Replies: 9 :: Views: 604
This kind of structure is called a Marchand Balun.
In a Marchand balun, the microstrip and the slot line meet in orthogonal directions on
the opposite sides of the substrate. microstrip line ground plane is in this case created
by one side of the slot line metallization. microstrip line is terminated by a stub, which (...)
RF, Microwave, Antennas and Optics :: 04.04.2011 02:57 :: jiboune256 :: Replies: 5 :: Views: 640
but I have open stubs. do you have any Idea about them?
An open stub in ideal lines is ideal open.
An open stub in microstrip has some extra capacitance.
For T-junction and cross, you will also see some difference between ideal (connected in one ideal (...)
RF, Microwave, Antennas and Optics :: 27.06.2011 13:40 :: volker_muehlhaus :: Replies: 8 :: Views: 1263
Hi, I am trying to design a microstrip complementary HPF (High Pass Filter) for my diplexer design. I have already designed the LPF section for that diplexer in microstrip using Pozar's equations. But, I am getting problem to design HPF. I am using a series capacitor as a first component in my design as I have restriction to use a parallel componen
RF, Microwave, Antennas and Optics :: 09.11.2011 20:06 :: snali :: Replies: 0 :: Views: 511
I need micro strip line matching network for 1825MHz , designed in ADS MOMENTUM. Schematic files are in attachment .
I want to match (0.5-j*0.6) ohm to 50 Ohm. I have tried many times but design does not work on prototype board. There might be some discontinuity issues which i have tried to solve using MSTEP component.
I want the matc
RF, Microwave, Antennas and Optics :: 21.12.2011 04:08 :: adnan012 :: Replies: 22 :: Views: 1797
you know for microstrip RF choke you need lambda/4 line that shorted to the ground using capacitor or some thing like that.for lambda/4 line,considering the substrate parameters you can use calculators of AWR microwave office or ADS and calculate the lenght.for the parameters that you need to consider for this line are S21 and Zin.you sh
RF, Microwave, Antennas and Optics :: 24.01.2012 23:56 :: young.microwave.eng :: Replies: 8 :: Views: 1779
i want to design a matching system by using microstrip..
the idea is zin=50 ohm and zl=75 ohm for example..
first try is by using open series single stub..
then i want to using a double stub but not really understand about how to draw the double stub smith chart..
second idea is by using taper (...)
Electromagnetic Design and Simulation :: 31.10.2012 12:00 :: smoulder88 :: Replies: 2 :: Views: 389
What is the capacitance of an open microstrip stub that measures 250mil wide by 850mil long. Fo=1GHz er=10.2 height=25mil
RF, Microwave, Antennas and Optics :: 20.05.2003 18:37 :: rfc :: Replies: 1 :: Views: 1194
Basically you need a short circuit at the end of the transmission line to get the proper termination. How do you get this ? By using a open circuited transmission line of quarter wave length. You set β=2Π/λ and Ls= λ/4 in the formula you have given and you get the stub impedance referred at the center
RF, Microwave, Antennas and Optics :: 26.11.2004 11:58 :: svarun :: Replies: 1 :: Views: 1039
I designed and tested some microwave oscillators using the negative resistance method ( as described by Gonzalez and Vendelin ).
I first designed the load and terminating networks using a shorted stub and transmisson line the get the oscillator oscillating. But my problem was that the resonating frequency deviated from the wanted one.
RF, Microwave, Antennas and Optics :: 30.06.2005 05:51 :: E-goe :: Replies: 2 :: Views: 687
1) Narrow band compact non-degenerate dual-mode microstrip filter
National Radio Science Conference, 2008. NRSC 2008
Volume , Issue , 18-20 March 2008 Page(s):1 - 7
Digital Object Identifier 10.1109/NRSC.2008.4542317
2) Compact hexagonal open-loop resonator bandpass filters using capacitive side-coupled stub and (...)
RF, Microwave, Antennas and Optics :: 27.07.2009 07:56 :: nafah :: Replies: 1 :: Views: 443
I have designed a band stop filter with shunt capacitivley coupled L/C resonators, I have then converted those resonators to open circuit stubs and finally converted the whole circuit to microstrip lines. I am now stuck for weeks trying to convert the coupling capacitors to microstrip gaps and I cannot (...)
RF, Microwave, Antennas and Optics :: 12.03.2012 15:29 :: maranello :: Replies: 0 :: Views: 265
Hye everybody,could u help me to calculate the value for microstrip interdigital capacitor (MICAP 1) in ADS...I need the value for W,L,G and GE..i can't find MICAP type in my spec is
f=2.5Ghz and 4 Ghz
RF, Microwave, Antennas and Optics :: 08.12.2012 07:20 :: saiyidah :: Replies: 4 :: Views: 433