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17 Threads found on Branchline
I designed a simple 90 degree branchline coupler in ADS, tuned it to my liking (my values were very close to theoretical). Now, I simulate the structure in Momentum and my curves are all off, I get 3 dB less since it got shifted by several GHz. Any suggestion and ideas why might my results be so different (and which one to trust)? imgur
HI all I want to design and simulate a wilkinson power divider 3 db branchline coupler and backward wave coupler in hfss, kindly help thanks regards kartik
I am looking at these pictures: 1) Single balanced mixer based on branchline coupler (90 deg): 2) 180 degree hybrid: and here on page 5: [URL="www.jpier.
I designed branch line coupler for 1.6GHz. My desired frequency is 800-2500MHz. I want to design 3dB response for entire band width. How to design the broad band coupler for required band width.
U can try: - a "T" divider (if u don't need low coupling between output ports) - magic "T" (u have a further freedom degree) - a branchline (4 ports, advantages on isolation between putput ports and on reflection at the input port) - Wilkinson divider (similar to the branchline but more compact) U should find everything on the most common
Dear all, I'm designing a TM21 circular patch in HFSS. To get circular polarization I designed a branch line coupler to feed the antenna. First I designed branchline coupler, than the antenna and at the end I have to place the antenna on the coupler. Coupler model and antenna model are correct and they give good results, but I can't connect co
hye..currently i am working on branchline coupler design for ka-band frequency range. for simulation, i am using ADS. how i want to know whether the coupler has a good LO/RF isolation or not? i have a s-parameter result of the coupler. which of the parameters (S11, S21, S31 and S41) should i compared to know my coupler has good isolation?
I am new to using HFSS, and have recently been trying to create a 90 degree branchline hybrid coupler. I want to eventually combine a bunch of these to make a Butler Matrix. I have designed it in ADS for 3 GHz, and got the results I was looking for there, but when I run it in HFSS, my plot still looks like a coupler, but not with as good of resul
I made a quick simulation and will attach the results. branchline hybrid with one section is a liitle bit too narrow for this wide 250 MHz band. You should add one branchline section more. Basically this kind of optimization is very trivial to be made in ADS and you will find the optimization goals I was using in the schematic. I hope you will g
Hello gvinu4u, For branchline coupler it is always better to start with Circuit Design tools initial design & optimization & then simulating in Electromagnetic tools for accurate simulation... I recommend AWR Microwave Office (MWO) which has good Microstrip/Stripline models library & integrated layout editor...which also has integreted em sim
Hello:) it is possible to connect 4 rat race coupler to get (a+b+c+d); (a+b-(c+d));..... a,b,c,d are the inputs. now im looking for a possibility to get this all on one singlesided pcb(bottom is gnd). i can also use any other couplerdesign to achieve the result (branchline for example). frequ:4ghz, sma(inputs and outputs) at the pcb edge (no
branchline couplers are great at low frequencies, like 1 GHz, where the line lengths are long with respect to the overall part. At high frequencies, like 10 GHz, the line lengths are quite short, and you start having to model the T junctions very carefully to get it on frequency. It would help a lot if you had an EMAG simulator to analyze the f
Do the outputs need to have the same phase? If not you can start with a quadrature such as branchline or coupled line to get two outputs then put another quadrature on each of these outputs. If you do not mind loss and no isolation, you can use resistive ones.
Does anyone know how I would prove and solve for the 4x4 s-parameter matrix using even and odd mode decomposition. Assume length is a quarter of a wavelength. And how where can i find the derivations for a multi-section branchline coupler. Thanks.
1. Does anyone have any experience with branchline hybrid couplers that split the output into unequal levels? 2. What are some references? 3. What happens to the (isolation, 90 degree, amplitude error) bandwidth as the split ratio departs from -3 dB each output?
hi, i want to design a branchline coupler. the two outputs S31 and S41 have a phase diffence of 90 degrees. is it possible to put this information in the OPT block as this function: PS31-PS41=90. my branchline coupler has to work in a frequency range of 1 to 2.5 GHz. Hope to find here some help. Thanks
I need to design branchline coupler for 63.87 MHz. Lambda/4 becomes 117.4 cm. by using dielectric substrate with epsilonr equals to 4.7, lambda/4 is 54.16 cm. I fabricated a coupler with this value. however I get isolation equals to 0.3 and other S parameters are not as I expected. Is there anybody who constructed a coupler before