Antennas for VHF and UHF (BP) by I.D. Poole

By I.D. Poole

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The electronic circuits in the satellite are powered by solar energy using solar cells that deliver the supply power of about 1 kW. The combination of a transmitter and a receiver is called a transponder. A typical satellite has 12 to 24 transponders. Each transponder has a bandwidth of 36 MHz. The total time delay for GEO satellites is about 400 ms and the power of received signals is very low. Therefore, a low Earth-orbit (LEO) satellite system was deployed for a mobile phone system. The orbits of LEO satellites are 500–1500 km above the Earth.

Therefore, the harmonic frequencies of the transmitter output signal with carrer frequency fc are given by fn = nfc . 14 Spectrum of the input and output voltages of power amplifiers due to harmonics. (a) Spectrum of the input voltage. (b) Spectrum of the output voltage due to harmonics. 24 RF POWER AMPLIFIERS where n = 2, 3, 4, . . is an integer. If a harmonic signal of a sufficiently large amplitude falls within the bandwidth of a nearby receiver, it may cause interference with the reception and cannot be filtered out in the receiver.

They exhibit long lifetime and durability. An active tag is supplied by an on-board battery. The reading range is of active tags is much larger that of passive tags and are more expensive. 27. The reader transmits a signal to to the tag. The memory in the tag contains identification information unique to the particular tag. The microcontroller exports this information to the switch on the antenna. A modulated signal is transmitted to the reader and the reader decodes the identification information.

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