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Hi fiwi,
Thanks for your nice simulation result.
Is this one for a circularly polarized patch or linearly polarized patch?
I tested only the linearly polarized patch.
I'm interested to know what happens with a circularly polarized patch as well.
yes, E-plane & H-plane are similar and looks normal.
I used linearly polarized patch antennas (inset fed rectangular microstrip patch ant's.).
Cross polarization level of the assembly (patch ant. + horn) is about 18-20 dB, from what I can remember.
I don't have the pair of antennas with me...
Thanks all for your nice ideas & explanations...
Actually I made a horn antenna with patch feed. I used a inset fed rectangular patch antenna.
It works very well at 12 GHz (my patch antenna works at 12 GHz and has a -10dB bandwidth of 0.3 GHz).
I use a conical horn (made out of a thin sheet of...
Hi all,
For circularly polarized and linearly polarized antennas, it's possible to use same directional antenna for Tx and Rx .
The radiation looks symmetrical and it makes sense the use of same antenna for transmitting and receiving.
However, if an antenna is elliptically polarized, the...
Thanks for the reply FvM.
Does it require to feed a square wave to the prescaler or is it possible to directly feed the sinosoidal signal which comes out from the RF front-end?
Hi all,
I got a down-converted signal from an RF front-end and the frequency of the down-converted signal varies from 1 kHz -100 MHz.
I need to know the frequency of the down-converted signal and take some decisions based on the frequency in an electronic circuit.
I found some...
thanks davenn for your advice :)
What type of tags, (I mean active, passive, semi-passive...) are used in Australian toll roads?
What I can see from web is most of the tags are passive & being powered with the toll post reader device.
I'm wondering, can they grab enough power to transmit...
Hi all,
What kind of RFID tags are used for the tags used in electronic toll collection in toll roads.?
What is the operating frequency of the tags?
cheers,
per_lube
It's possible and I've tried it with an x-band oscillator. Works without a problem.
When you switch the power of a VCO, the rising and falling edges of the switching signal should be as short as possible.
I've experienced, when there are slow rising and falling edges, VCO ouput frequency...
Hi jiripolivka,
Thanks for the reply and explanation.
I isolated the problem. Now it works... now having about -40 dBm minimum detectable signal power in x-band.
cheers,
per_lube
Thanks jiripolivka.
My question is the polarity of the generated voltages from the detector and biasing voltage.
For example, the third cct. in my post generates a negative voltage output when there's no bias voltage applied.
However, to bias the two diodes, I should apply a positive voltage...
yes, it's possible to do this...
Please make sure to keep equal track lengths for driving the clock inputs of two micros.
This is really important to keep proper timings...
Remember, signals travel about half of the speed of light on FR-4 PCB boards... therefore differences in track lengths...
What I've experienced so far with Kintex is the available support is very little in the internet and from sales representatives...
If your requirement is to learn something new, that's a good option... if you need to implement something quickly, think a little bit more....
cheers,
per_lube
Hi,
I saw the following cct. diagram in Avago AN1088: Designing the Virtual Battery.
What I understand is to bias the detector diode to reduce the impedance of it, a negative (-ve) DC voltage should be supplied when there's no RF input.
However, when there's an RF input, a positive voltage...
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