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Thank you guys..... its working now..The output voltage of second GSM module is around 2.8V. So I used a 3.3V to 5V voltage converter in between GSM txr pin and PIC rxr pin. Now its show response messages.
I have two GSM SIM900A modules. First GSM module is properly working with LCD. When I use second GSM module, its working but doesnot show any response message on LCD. So I think LCD is good but not work with second GSM. Also there is no problem in communication section, otherwise its not work...
I am connecting GSM module SIM900A with PIC microcontroller and show their response on LCD. When I send AT commands to GSM module, it does not show any response messages. I made a call to my phone through GSM module using ATD command and hang up through ATH command. But in this case also it does...
how to get desired axial ratio bandwidth for a circularly polarized bird nest antenna
hi sir
I have to design a antenna look like bird nest with probe feeding. The axial ratio bandwidth at 3dB in the paper is 54% when theta=30 and phi=0. But I didn't got any point below 3dB at this angle.I...
hi
I almost obtained the reflection coeff graph with bw of 30% even the paper contains 40%. But I didnt get the axial ratio plot with points below 3dB. what parameter in antenna has to be changed to obtain this graph? my antenna contains the probe at the center of circular ground plane and 8...
hi
I have to obtain the axial ratio bandwidth .But when I tried to plot this graph, there is no point below 3dB and also shows some ripples at frequencies. What has to be done to improve the axial ratio plot. pls help me
thank uuu
Hi
I have designed an antenna look like bird nest works on circular polarization. But I need to find the Impedance bandwidth and axial ratio bandwidth.When I plot the axial ratio, the minimum point is obtained at 5dB and no points below the 3 dB. So that I can't find the axial ratio bandwidth...
I simulate a antenna look like bird nest. But I do not get the reflection coefficient at the freq. 5.3 GHz. What will I do to get correct value. Pls help me
Thank you sir, the error is removed. But when I run this design , the graph obtained for reflection coefficient is entirely different from the expected graph. What are the parameters has to be tuned to obtain the original graph. Pls help me
hi
I try to increase the size of air box. But it shows the same error as " Boundary 'PerfE1_gnd' is an infinite ground but does not touch a radiation surface." I really need your help to solve this problem
Hi
When I try to design this antenna with air box having dimension 200 mm x 200 mm x 80 mm, it shows an error in hfss as perfect E boundary of ground does not touch the radiation surface. Pls help me to solve this error.
hi
I am desining a antenna that consists of a circular ground plane, probe is located at the center and arond it there is 8 paralelpied elements constitute wave polarizer that convert linearly polarized wave generated by probe into circularly polarized wave. Here length of probe is 13.5mm...
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