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    Waveguide isolator and coupler manufacturers

    Hi, we are looking to purchase WR12 waveguide isolator and couplers. Being new to waveguides, can anyone recommend some reputable companies that manufactures these components?
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    Why we use 50MHz as a reference?

    Thanks for the replies, but I think the question is why 50MHz instead of why 50 Ohms.
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    Why we use 50MHz as a reference?

    Hi, Why in measuring RF power, a commonly used reference is 50MHz? Why not 100MHz or 60MHz or 55MHz? Thanks.
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    Difference between average and CW power

    Hi all, When measuring RF power using a power meter and power sensor, what is the difference between average power and CW power? For a sine wave type of signal, is the average power and CW power the same thing? What about for a pulsed signal like GSM, which I suppose there will be no CW power...
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    Capacitors operating frequency

    Hi all, how do I know what is the maximum frequency that a particular capacitor can handle? Some datasheets I came across don't specify this thing. I need to find capacitors that will be able to work up to 5GHz. Thanks.
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    The LNA stability checked through phase margin and k factor

    Re: LNA stability You can use the built in funtion in ADS, in S-parameter simulation. Like s_stab_circle, mu etc...
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    Importance of RF chokes

    Hi, what is the use of RF chokes? Is it to block the RF power from interfering with the DC bias network? What will happen if the amplifier has no RF chokes? For wideband amplifiers, is it important to use RF chokes? Thanks.
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    Stabilizing output port of a wideband LNA

    Thanks, adding a series capacitor with the shunt resistor solved everything. Now the amplifier has more gain too compared to a series input resistor.
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    Stabilizing output port of a wideband LNA

    Yeah, I know adding a series resistor at the input will improve the stability. I am just curious if adding a shunt resistor at the output is possible. Seems like no values I tried is possible.
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    Stabilizing output port of a wideband LNA

    Just wanted to ask if it's possible to stabilize an amplifier by placing a shunt resistor at the output of the amplifier. I notice that all the RF power will be shunted to ground if I place the resistor there. Adding a series inductor choke to the resistor didn't help at all, the S21 is still...
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    How to know whether the FET is a depletion or enhancement type?

    Hi, how do I know whether the FET is a depletion or enhancement type? Which type is the PHEMT?
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    Strange results of S-parameter simulation

    s parameter of 100 ohm resistor Thanks a lot, it sure helped me. :) Now I wonder why is the resistor there in the first place since it will attenuate the RF signal.
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    ADS warning message: Resistor Q1.Re2 is shorted.

    Re: ADS warning message That resistor should be an internal resistance of the transistor, but I cannot find any resistor in the transistor internal schematic diagram.
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    Strange results of S-parameter simulation

    bfp405 unstable amplifier Hi, I am doing a S-parameter simulation for a wideband LNA. But the problem is the simulation results is far from expectation. I am using Siemens BFP405 transistor. I have used some RF chokes for the DC biasing circuit and two DC blocking capacitors. What is the...
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    ADS warning message: Resistor Q1.Re2 is shorted.

    ADS warning message Hi, I am just wondering what is the meaning of this error message when I simulate a circuit in ADS: Warning detected by HPEESOFSIM during netlist parsing. Resistor Q1.Re2 is shorted. The transistor is Siemens BFP405. I can still view the simulation results though. Thanks.
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    Antenna Radiation Pattern

    You can get a lot of stuff here: **broken link removed**
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    Selecting a Wideband LNA Transistor

    lna bfr540 Hi, how do I select a suitable transistor for a wideband LNA with a bandwidth from 1GHz to 6GHz? Since the upper frequency is 6GHz, I assume the minimum transition frequency should be 12GHz. Is it necessary to do so? Do I need to select a transistor that is specifically made for...
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    Books about ultrawideband LNAs

    Re: Ultrawideband LNA Thanks. I just got an ebook version of Broadband Microwave Amplifiers from Artech House. About the articles in the past issues of Microwaves & RF, is the articles by Joseph F. White? If it is, then I think all articles he wrote is in his book: High Frequency Techniques An...
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    Books about ultrawideband LNAs

    Anyone knows what other books should I read to design an ultrawideband low noise amplifier? I have Microwave Circuit Design by Vendelin, Pavio and Rohde and High Frequency Techniques by Joseph F. White with me.

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