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making UCA using spirall antenna

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uzmeed on 30 Aug 2018
Answered: uzmeed on 5 Sep 2018
I have to modle a receiver that has spiral antennas placed equidistant in a circular array.
In phase array tool box I could not find any option for spiral antenna please help in this regard

Answers (4)

Honglei Chen
Honglei Chen on 30 Aug 2018
Phased Array System Toolbox models antenna at pattern level. You have two choices:
1. Capture the pattern of a spiral antenna and assign its pattern to a phased.CustomAntennaElement and then you can use that element in UCA.
2. If you have Antenna Toolbox, you can directly use their spiral antenna as the element of your UCA

uzmeed on 3 Sep 2018
Edited: uzmeed on 3 Sep 2018
I am using the phased array custom antenna design and entering 17 frequencies. for frequency response should I add the maximum gain at that frequency. If I do it I am getting an error dialog
"Expected Radiation Pattern to be size ... where L is either 1 or length of the frequency vector"
How can this error be resolved Regards Uzmeed

Honglei Chen
Honglei Chen on 4 Sep 2018
If you have 17 frequencies, then your FrequencyResponse is either a scalar, which means the response is flat across all frequencies, or a 1x17 row vector, specifying the response for each frequency. Does this help?
  1 Comment
uzmeed on 5 Sep 2018
No the frequency response is different for all 17 frequencies and for fixed rangeelevation i have az data spanning over different angle range Same as for fix az el data spaning over an angle
I am confused in filling the Radiation pattern matrix in the sensor array . Like what will correspond in rows and what will correspond in col

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uzmeed on 5 Sep 2018
As a second option I designed the spiral antenna using the following command sa = spiralArchimedean('Turns',2, 'InnerRadius',2.5e-3, 'OuterRadius',35e-3);
and ploted as follows show(sa)
The radiation pattern is as expected but when I make an array the radiation patterns seems distorting array = phased.UCA('NumElements',6,'Radius',0.508,'Element',sa); fc=8e+9; c = physconst('LightSpeed'); pattern(array,fc,[-180:180],0,'Type','directivity','PropagationSpeed',c)
Please comment what mistake I am making

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