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Recent content by AmirMohammad

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    UVNA-63

    Its a very good and simple network analyzer, but I have no information about its capabilities such as resbw.
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    UVNA-63

    Hi Has anyone here worked with UVNA-63 Network Analyzer?
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    PCB Connector

    I prefer 2 parts rather than 3 parts because of weight and price.
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    PCB Connector

    thanks, but Huber has only female ones. Board to board connectors are preferable because of these tolerances that they can tolerate for example 1.2mm in MMBX connectors of Huber.
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    PCB Connector

    Thanks I saw Rosenberger catalogue. It has only male connector plus female adapter and doesnt have female connector.
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    PCB Connector

    Thanks This is true when you want to use a cable to connect a cable to a PCB and usually a male cable connector can mate with a female board connector . But in this case we want to construct a board-to-board connection , thus we need a pair of connector with opposite sex; In the other word a...
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    PCB Connector

    Why do pcb connectors such as MBX, QMA , ... have only female type and dont have male?
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    minimum reflection match or maximum power transfer match

    Between two approaches for impedance matching (minimum reflection or maximum power tranfser) which of them can result in more gain in an antenna?
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    what is mean by wave port & lumped port in HFSS ?

    wave port is better everywhere.
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    what is percentage impedence BW of this S11 vs freq curve foe wideband antenna

    Hi, for percentage bandwidth you should calculate center frequency using equation fc=sqrt(fl*fh) and then percentage bandwidth will be (fh-fl)/fc. fl and fh are the points your response crosses threshold. usual threshold is equal to -10dB for return loss or equally 2:1 for VSWR. Somewhere...
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    S-params can be result of nonlinear model of device, or it is used only ofr ac/dc?

    Hi, you can use s2p model or nonlinear model in simulation softwares. If you use s2p model, software uses fixed s2p parameters defining component in all conditions such as bias, etc. , but if nonlinear model is used then software applies biasing condition to the component and calculates...
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    what is mean by wave port & lumped port in HFSS ?

    Hi, wave port is a perfect definition of a port which software calculates field distribution on it and impedance will be calculated too. But if there be no possibility to define the port inside the simulation volume, it is not the best solution but the only solution to define lumped port...
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    Array Antenna Amplitude Tapering for SLL Reduction

    I think 2-3dB defradation of sidelobe is due to fabrication. In my experience of an array of 16 horns with a 30dB SLL goal, I had 2 dB degradation due to feeding network and cables and 1 dB due to antenna itself mechanical errors that finally concluded to a 27dB SLL. Specially in slot which...
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    Defining the outline in phased array

    Hi In designing phased array how can I define the outline containing elements, what difference between circular outline, hexagonal outline, rectangular outline etc.?
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    Problem with FDTD (Extraction of S Parameters, problem with input and output waveform

    Hi dt plays the Major Role in stability, reducing it from that magic value increases the stability while increasing simulation duration. Thus at first step reduce dt by 10% and more and more until it get stable.
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