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Microstrip Open Stub

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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. and B. Wadell, ?Transmission Line Design Handbook?, 1991 Artech house Boston.London, p. 300-305. but i have not none of the abow. ha
Hi guys, I'm new here. Just a quick question: One of my assignment is to simulate an open stub through a transmission line (50ohm) to a load of 155 ohm. I used my smith chart to calculate the distance and length of the stub (in terms of wavelength) but I do not fully understand how to convert those numbers to design a physical (...)
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
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.
Hi all, 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
You can make a via to the ground plane then fill it with copper this way you can short the microstrip transmission line .
Shunt distributed microstrip inductor cannot be realized using open stub. Try to integrate somehow in your circuit the shorted stub necessarily to make the equivalent inductor.
I am curious if there is a way to tune a FABRICATED microstrip circuit? I sent my design (9GHz oscillator) to a fabrication company. After they build its prototype, would I still have a way to tune the prototype?
When designing matching network, is it totally equal? I do calculations: openstub=ATan(-i*50/Zs) openstub = -1.335176878e0 Shortstub=ATan(Zs/i*50) Shortstub = 1.569130208e0 Here i trying to find electrical length of stub knowing impedance Zsource. For short (...)
1. Where should we use them (Uses) 2. Formulae used to dedign 3. Merits / demerits 4. Numerical modelling 5. Specific problem you faced :!: :idea: :?:
It seems we can buy coupler that made by strip line technology,not microstrip line. What's the benefit ? lower loss & good directivity?
Hi all, 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. ThX Best rgd :D
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
any guidance on how to design the connecting pad between component. 1)for eg, if i have resistor in series with a microstrip opencircuit stub, do i still need a connecting pad in between? 2)For discrete component how to design the connecting pad.
Hi Anybody has experience with open and shorted stubs? I'm am especially interested in the diffirence in performance,if you implement a stub as a short or as an open. Did you microwave guys encounter great difference in performance? Why I'am interrested in this? I'm currently designing microwave oscilators and (...)
Hi, 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. Thanks.
Hi, I'm little confused with the stub position in stub tuning process. Let's say we have been given to match a load using single-stub whether short or open. I did both as an exercise and where I got myself stuck was the position of the stub. The query is: whatever the stub is? whether (...)
Hi, I'm little confused with the stub position in stub tuning process. Let's say we have been given to match a load using single-stub whether short or open. I did both as an exercise and where I got myself stuck was the position of the stub. The query is: whatever the stub is? whether (...)
Hello, BPF_Layout.jpg is a microstrip stub-line Filter... Transversal_filter.jpg microstrip coupled resonator Filter... ---manju---
I've read several research papers about full waveguide band MMIC tripler for W-band, recently. Such as 《A W-band GCPW MMIC Diode tripler》、《A Full Waveguide Band tripler for 75-110GHz》?? In these papers, the simple open-circuited stubs were used to present an approximate short-circuit at the diodes from 75-110G
Hi all, I have problem with microstrip delta stub design. I referenced some paper about radial stub, ... but can't find exact program for calculation, even wrote some maltlab m-file for it.But my results are different from others done by some author. Specially, in the paper "A NEW KIND OF RADIAL stub AND SCME (...)
Hi, 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 (...)
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 (...)
i everybody How do I Calculate input impedance of radial stub that has angle, radial or length, wide of input part? That is very important for me. Please give me a simple formula. RADIAL stub.gif radial.JPG 593745937559375 the input impedances is given in the two r
Why it differs from impedance of microstrip line? We can see at antenna as open stub with length L and width W. What is the idea behind this "edge impedance"? Here is patch antenna calculator: It seems that it uses formula: z=90*(Er^2/(Er-1))*(L/W)^2 When usi
Is there any way to design a matching network using shunt elements with an nec based program? It appear that only series loads are allowed. I need a shunt negative reactance to ground at the feed point. I'm using eznec. rfc
Hi All, I have a coplanar T-Resonator. It's an open quarter wavelength resonator. I'm using the resonator for substrate characterization. I did 2-port measurement by taking the T arms as port 1 and port 2. My questions are: 1. How can I extract the quality factor due to the conductor losses and the radiation losses. 2. Do I need to take the T
hi guys,here some design of the lpf and bpf in IE3D PACKAopen by excel or the notepad,enjoy
hi all,i want to optimize the input and output matching of LNA atf36077 at x band with center 10 ghz, is there is away to optimize to cover all the band,i use single open stub,i know that it is narrow band ,any method to wide the matching other than using single stub pls reply me
Dear sirs, I am now studying bandstop filter design using coaxial cavity.who can give me any references or devices?thanks. Liuyun
Hi all, I need to design a 6Ghz VCO. In a post on this board last year there was a question about designing a 5Ghz VCO. The link to that discussion is response from board member "DJ" was as follows: "Simple. Use BJT 681000 (of Nec)or its package or 420000 (Of @gilent). Load the Emiter by
Hi All; I'm looking for the analytical equations for disigning 2 kinds of radial stubs : - microstrip radial stub. - slot radial stub. thanx in advance. aze.
Dear all, Could you suggest a reading or technique for designing all pass filters. Stripline / microstrip, 1GHz, 200MHz span. Thanks
hi all, i am currently designing a microstirip patch antenna and i am using a 1/4 wave transformer to match the feedline to the patch. but however i am not very sure what does 1/4 wave transformer mean? does it matter if i use a 1/2 wave transformer? is size the only thing changed if i used a 1/2 instead of a 1/4? thanks a lot
For high resonant microwave structure, you should use Frequency-Domain method (FEM, MoM) to analysize it. For 2.5D microwave structure, it is more effective to use MoM method. Therefore, you should use Sonnet em or Momentum or IE3D to analysize the microstrip open loop resonator because these simulators have more effecitve meshing and more
In ads mirocstrip option it contains MLEF and MLOC. What are the difference. If I use open stub for the mathing network which one should i choose? Thanks in advance.
Hi, Im making a phase shifter to operate at 1GHz. Now I have been told to tune the diode using stubs? How can I do this please.Treat as urgent. Thanks
Hello All. I design the microstrip coupled line filter with help Microwave Engineering Pozar. Parameters of the filter was calculated for 0.8Ghz passband with central frequency 14.4 Ghz. After i modeled it in the schematic and layout (It's shown on the pictures P1 and P2). And results was very different (see last picture)
Dear friends: In order to design a broad band DC bias network, I designed a microstrip radial stub. I have almost get about 2.5 GHz bandwidth. A) Is this a typical bandwidth using radial stubs? B) To reach higher bandwidths, what do you suggest? Should I use an array of stubs? or should I use some elements? (...)
Hi i designed top-c coupled bandpass filter with transmission line stubs and SMT capacitors. I dont know anything about layout and for this reason i used ADS's automatic layout generate function. When i converted my design by this way and simulated with Momentum i got results that are very very bad.Instead of filter I tried with very simple matchin
Hey, I have two questions here need some advices. For the tuning varactors, how can I bond them with the short-circuited stubs fabricated on RT/Duroid substrate? The stubs widths are 750?m. Can I use wire/ribbon bond? Or I just solder them togehter? The whole device will operate at X-band. I've read many papers but can't find any answers till
Hello all, I am working on single diode frequency multiplier. Could anyone please tell (with reference) what is the relationship between return losses of the multiplier and conversion loss. If the input is matched to the diode impedance, more power will be delivered to it, this implies less return loss at the input and less conversion loss.
Hello everyone, I am working on a high linearity (~40dBm OIP3) X-band class A PA design. Output power should be in the range of 20~25dBm. The amplifier needs to be matched to 50ohm impedance. Here is the problem. I used conjugate matching for the amplifier output (it can be treated as unilateral). The output power increased at the designed fr
Hi All: We sometimes want our filter to have better selectivity so we will try to add transmission zeros at higher or lower bands. When I read the paper, they would use additional open stub or parallel-resonance to locate zeros at specific frequency; however, it usually accompanies with radiation loss. (We may see |S11|^2+|S21|^2<1; for instance
hi i want to increase the s11 parameter of the power splitter to occupy a wide bandwidth,i have changed εr value too..can anyone suggest a way to increase that s11???
Hello, I created a layout component in ADS. at 450MHz I simulated the input impedance for two different resistance values placed between two ports. Using a 50 ohm resistor I measured roughly 50 ohms. Using a large resistor I measured roughly a short. My mesh setup is attached. Can anyone explain why ADS is giving these incorrect values and
dear friends i was designing a matching network in which i designed a open stub of value 185 ohm with 84 degree length. now the problem is we could only fabricate up to like 65 ohm. i have been told to convert it to lumped component. when i placed its equivalent lumped element i achieve a very narrowband matching. how should i place more lum
Hi All, I need some basic reasoning for the following questions related to the transmission line theroy. Hope so i will get some good answers or documents or links which will clear it up. when a transmission line is left open at one end, the fringe fields are modeled with a parallel capactitor from the end of the line to ground. So the questi
I want to design a mixer I used ratrace and designed it in ADS so it will work good enough @1.95Ghz ( the average of LO and RF) now the next step is connecting diode and ... I have some basic idea. I read Maas book. For example I will use microstrip Radial stub to get rid of LO and RF a
I did some excersises on impedance matching. Now i realized how to do series line match of 50 Ohm line to some 123 Ohm load, etc.. But when it comes to transistors and diodes i totally lost: for example, i download datasheet on few transistors and schottky diodes, but there are no any data on complex impedance, etc.. So, if i need to do open-s