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Hi,
If Antenna impedance is Zin, antenna radiation resistance - Rrad, that Zin=Rin+j*Xin=Rrad+Rloss+j*Xin. Where: Rloss - loss resistance of antenna, Xin - reactance resistance of antenna.
Hello, Junaid Iqbal
There is images, which represent the steps:
1.This step necessary to display of farfield for different frequencies
2. Frequency range and step size are set
3. Appropriate list is displayed in navigation tree
4. Start solver
5. There is result of farfield at frequency...
Hi.
I have simulated the patch with dimension W 25.84mm, L 19.78mm, which is fed by coaxial probe, and have obtained next results
I assume, that need to change dimension of the feed line and width of patch.
Hello.
The bandwidth of microstrip patch can be increased by using of coupled resonators (patches):
-APERTURE COUPLED MICROSTRIP ANTENNAS;
-STACKED MICROSTRIP PATCH ANTENNAS https://www.edaboard.com/threads/214935/
Cable 0.141" has lower insertion loss than cable 0.086". But for lengths less than 10cm with connectors this difference is not significant, and cable 0.086" has lower bending radius for ease of installation.
Working frequency range of coaxial waveguide is limited by minimum wavelength λmin≈π*(D+d)/2. Where D is outer diameter, d is inner diameter. For wavelength<λmin, higher types of waves are excited in coaxial waveguide.
Here graphics of attenuation vs frequency.
I approximately modeled circuit...
Parameters of pin-diodes were replaced by equivalent resistance and capacity.
Below results were obtained with CST
But here length connections should be minimum in field of serial connection pin-diodes.
elchiquito, thank you for your attention.
Patch elements are spaced with L.
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L is the wavelength equal to the center frequency. Frequency range is 10...11 GHz.
Phase distribution along array is determined by wavenumber k=2Pi/L. So, the phase difference is a multiple of zero or 2Pi at...
Hello!
I need your advice.
Design microstrip array is shown on this image.
[url=http://obrazki.elektroda.pl/72_1333004259.jpg]
Here linear symmetric phase error grow at boundary of frequency range. It leads to distortion of the main beam.
[url=http://obrazki.elektroda.pl/85_1333006268.jpg]
My...
Hello, mauloftin.
Sidelobe of parabolic antenna can be also reduced by:
-special amplitude distribution, which provides zero field of the edge of parabola
-rounding of the edge of parabola
-dephasing of edge currents, where field of different edges has the phase difference 180 deg
-use...
This circuit of SP3T switch. I think that the circuit of SP4T switch can be designed analogically.
https://obrazki.elektroda.pl/1_1331901678.jpg
And the circuit of SP4T switch can be designed by combining basic SPDT switches.
https://obrazki.elektroda.pl/37_1331901958.jpg...
Far field is a function of angular coordinates teta, phi. Therefore, Far field=E(teta, phi), normalized Far field=E(teta, phi)/Emax.
Far field of dipole f angular coordinate phi =1
%Far field of dipole f angular coordinate teta
t=-90:0.01:90;
E=cos(t*pi/180);
plot (t,E,'k');
grid on;
%Far...
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