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In which communication The signals are transmitted and received using antenna?
radio waves
Antennas can be designed to transmit and receive radio waves in all horizontal directions equally (omnidirectional antennas), or preferentially in a particular direction (directional, or high-gain, or “beam” antennas).
How do antenna receive signals?
The antenna at the transmitter generates the radio wave. A voltage at the desired frequency is applied to the antenna. At the receiver, the electromagnetic wave passing over the antenna induces a small voltage. Thus, the antenna becomes the signal source for the receiver input.
Can a single antenna receive and transmit signals at the same time?
Yes, and often to save space and costs engineers will do this (it’s less effective than having multiple antennas, but there are plenty of factors that go into design choices and often sacrificing the second antenna is worth some other benefit). The interesting part happens behind the antenna.
How are the transmit and receive signals separated?
The transmit and receive signals are usually separated with a ferrite circulator. For good isolation between transmit and receive signals, the antenna should be well matched so that the transmit signal is not reflected back into circulator that will route the reflected signal directly to the receiver.
Can a GPS antenna be used as a transmitter?
2 Answers 2. No. Many types of antennas may be unsuitable for transmitting. A so-called active antenna contains an integrated low-noise amplifier (LNA) for amplifying weak signals. (This is very common for GPS antennas.) This amplifier cannot pass a signal in reverse, and could be damaged by transmit power levels appearing on its output.
Can a receiver handle a strong transmitter signal?
Yes. The trick is in making sure the receiver can handle the strong transmitter signal. One way to do this is to have transmitter and receiver at different frequencies, then use filters to prevent the transmit signal from getting into the receiver.