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Fiber Optic Sensor
hi!
i am trying to make a detector that will count everytime an object passes through.
i am looking at the possibility of using photo interrupters as my sensor but all the sensors i could see have very small gaps. i am looking for a wider gap, as much as 15mm.
i am trying...
2.4 ghz attenuator
hi!
i am trying to make an attenuator at 2.4GHz
any suggestions?
will a pi/tee network work at this freq?
if yes, what will be the best type of resistor to use?
thanks!
hi all!
is fr4 a standard?
i mean if one material is said to be fr4, will other fr4 materials have the same characteristics?
also, will the dielectric constant change with the width of the fr4?
thanks much
vpm
antenna+enclosure
i have made some simulations in HFSS. plastic does indeed have little effect.
metal is another story.
i think i have found a perfect place for my antenna. though it is still inside. sadly, i can't put it outside.
i have another question though, the simulations i made were...
antenna enclosure
if i am going to put an antenna inside a plastic enclosure what should i need to consider?
what i can/cannot do
this is a zigbee application
will plastic have a great effect on my gain?directivity?
front: lcd display+microcontroller (digital)
back: power ckts+heat sink...
hfss print model
hi guys!
how do i print my design to scale?
i tried exporting it in jpg, bmp but it is not to scale
i also tried DXF then opened it in Autocadd, again it is not to scale?
i am simulating antennas and i would like to make the actual already to test it.
but i can't! i need to...
antenna parameters
Hi!
I am simulating different antennas in HFSS.
Besides the S11(refl coef) what else should i look for?
what other impt parameters do i need?
thanks a lot
lumped antenna
Hi Guys!
I am trying to simulate a halfwave antenna.
I am not sure about my port definitions.
Attached is what I did:
It is a lumped port that connects the signal line on top to the ground plane below.
The FR4 layer and airbox is hidden here.
Is this correct?
Also could you...
inverted f antenna design
Hi guys!
I am designing an antenna for zigbee applications.
I am looking at antennas from different makers and simulating them just to have a basis for my design.
I think i have a problem with my setup in HFSS. I do not get the published results. I mean it is not even...
through hole sma connector
i purchased a cable instead of just the connector
the cable has male ends. this way i only need female connectors(which i already have)
yey! :)
how to solder sma connector on circuit board
i am magically repelled by mechanical drawings :)
this is perfect! but our supplier(rs-online) does not have this at hand :(
all the male sma's(from radiall) have a "crimp termination method" and all are "cable mounts".
i imagine these are what...
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