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Broadband Impedance Match

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12 Threads found on edaboard.com: Broadband Impedance Match
Dear Darshkamal. Your Question wasnt quite clear but,ways of achieving broadband matching is 1.Instead of using one single quarter wave transformer to match the load to the characteristic impedance. we use a cascade of quarter wave line sections of gradually varying characteristic impedances.Though zero (...)
Yes, you can use a quarter wave transformer between the feedline and transformer. But it is a very narrowband match. It works only for a specific frequency. You can go through Microwave Engineering by Pozar to know about broadband matching.
You need to load pull the output so you can come up with a family of matching curves on the Smith Chart. But that is the least of your problems. If you expect to have a broadband match from 10-50MHz, that is over two octaves and it is unlikely you can do this with simple L/C matching techniques. You will have to build (...)
A matching network usually is for one frequency band. Is true, PI network can match broadband frequencies, but not the case of 900MHz and 1800MHz in the same time. As I mentioned, the antenna shall be designed and tuned (not the matching network) in the way to provide resonances and reasonable VSWR on different bands.
Why do you care about the impedance match? What are you driving it with? Since your load is more like a short circuit than a 75 ohm load, why not drive it with a current source. It will be broadband, and you do not need any whacky on-chip inductors. You just need on on chip transistor. Biff44, Can you explain this te
Hi, I have the following broadband power amplifier 400M-1G that I need to reverse-engineer sort of and having problems calculating the impedance match. I do understand that the coaxial cable transformers (Zo=10ohms) sort out the basic transformation ratio but still the transistor (LB401) has got capacitive input and inductive output. That (...)
A digital signal is very broadband. Therefore a quarterwave transmission line transformer will not work, since it is a narrowband impedance match. But, the basic answer is correct, at the gate end of the long transmission line, the energy travelling toward the load has to see the same impedance as the trasmission line. (...)
I think I see what you are asking. If you design a bandpass filter with low loss L's and C's, it will have a nice low loss passband, and a good rejection band ONLY if the load is a broadband 50 ohm match. If the load is no 50 ohm somewhere in the rejection band, you may not get the desired ammount of dB's of rejection. This is because the bandpa
Hi all, A friend of mine is having a problem designing a broadband 30MHz antenna. He has a wire antenna (about 30 cm) and he is designing a matching network, but he is always having a narrowband design. Can you tell me if there are techniques to make a short wire antenna (intrinsically narrowband) broadband? Thank you very much in (...)
When you design a filter, there is an assumed fixed, broadband output impedance. In a Duplexer, the two output ports both see the fixed, broadband output impedance in parallel with the output impedance of the other port. This means that you will have to tweak the both filters to match the (...)
To get the best performance, the IF port should see a very broadband match. The IF port wants to see 50 ohms even out of the band of interest. This is done with a diplexer. The RF port just needs a good match over the RF band, its not important out of band. The LO port is the least critical. You just have to have a good enough (...)
Not only that the transformers can be used for broadband impedance matching (especially with high ratio) but they can also be used in effective conversion from single-ended to differential configuration and vice versa.