Hello biff44
Thank you very much for your answer.
I fabricated a new double ridge horn antenna. As I mentioned that I have two signals which have same rise time and same fall time. The amplitude of these signals are same with different sign, for example first signal has amplitude of 30 V and the second has -30 V. There is no delay time between these signals which mean that these signals will applied at the same time (see attached file (figure.1)).
I applied these signals on the fabricated antenna in different ways:
1- I applied only one signal on the transmitter antenna as shown in the figure 2. And I received on the receiver antenna this signal (figure 3). In this case the inner conductor of the coaxial probe pass through the upper ridge and is then connected to the lower ridge. The shield of the coaxial probe is connected to the upper ridge.
2- I applied two signals on the transmitter antenna as shown in the figure 4 (both signals have been applied at same time, there is no delay between the signals). And I received on the receiver antenna this signal (figure 5). In this case the inner conductor of the first coaxial connected to the upper ridge and the shield of the first coaxial probe is connected to the same ridge, the inner conductor of the second coaxial connected to the lower ridge and the shield of the second coaxial probe is connected to the same ridge.
3- I applied two signals on the transmitter antenna as shown in the figure 6 (both signals have been applied at same time, there is no delay between the signals). And I received on the receiver antenna this signal (figure 7). The inner conductor of the first coaxial probe pass through the upper ridge and is then connected to the lower ridge. The shield of the first coaxial probe is connected to the upper ridge. The inner conductor of the second coaxial probe pass through the lower ridge and is then connected to the upper ridge. The shield of the second coaxial probe is connected to the lower ridge.
• I think case number (1) is normal for the operation of double ridge horn antenna with one feed point.
• Case number (2), there is no signals to be transmitted because the inner conductors of the coaxial probes are shorted (the inner conductors of coaxial
probes are connected to the shield of coaxial probes (ground)).
• Case number (3), the amplitude of received signal is approximately equal to be two times of the amplitude of received signal in case (1) (see figure 8).
My questions:
1- Could you please explain me why the amplitude of received signal in case (3) has been increased comparison to the amplitude of received signal in case (1)?.
2- What about the isolation between coaxial probes in case (3)?, do you think there is transition between the probes in this case (3)?.
Actually I achieved what I want which is increase the received power (case 3), but I could not understand how this happen?.
Figures (A, B, C) show the configuration of the double ridge horn antenna
Thank you very much for your time
Best regards