periodic antenna वाक्य
उदाहरण वाक्य
मोबाइल
- The log periodic antenna made possible broadband reception of color television signals.
- Horizontal Log Periodic Antenna tower at NRTF Niscemi.
- The log periodic antenna was invented by Dwight E . Isbell, Raymond DuHamel and variants by Paul Mayes.
- PaST will consist an array of some ten-thousand log-periodic antennas spread over several square kilometers.
- The log-periodic antenna has existed for decades, but are any other fractal designs in use for TV reception?
- Equipment included three Collins Radio 250 kW HF transmitters and five log-periodic antennas directed at East Asia and South-east Asia.
- In 1983, a steerable-beam HF radar with 16 log-periodic antennas began operations at Goose Bay, Labrador, Canada.
- With more complex antenna structures ( such as the log-periodic antenna ) the effects of mutual coupling can make the phase centre locations unknown.
- The log periodic antenna is similar in appearance to a Yagi, but all of its elements are driven elements, connected to the transmitter or receiver.
- So a typical rooftop Yagi or log-periodic antenna with horizontal conductors, as viewed from a second station toward the horizon, is necessarily horizontally polarized.
- Dipoles may be used as standalone antennas themselves, but they are also employed as reflective array, turnstile antenna, log periodic antenna, and phased array.
- Until the development of the log periodic antenna in the 1960s it was the only type of antenna that could give adequate fringe reception in areas far from the television transmitter.
- The most common types are the Yagi antenna, the log-periodic antenna, and the corner reflector antenna, which are frequently combined and commercially sold as residential TV antennas.
- After World War II the rhombic largely fell out of favor for shortwave broadcast and point-to-point communications work, being replaced by log periodic antennas and curtain arrays.
- The log-periodic antenna is a more complex design that uses multiple in-line elements similar in appearance to the Yagi-Uda but using transmission lines between the elements to produce the output.
- The log-periodic antenna is a modified, folded up, square self-complementary antenna with log-periodic shape, and the original structure before its modification has a typical self-complementary shape.
- "' Dwight Isbell "'was a radio engineer, I . E . E . E antennas and propagation fellow, and co-inventor of the Log-periodic antenna while a student at the University of Illinois under Raymond DuHamel.
- The most common form of log-periodic antenna is the "'log-periodic dipole array "'or "'LPDA "', The LPDA consists of a number of half-wave dipole driven elements of gradually increasing length, each consisting of a pair of metal rods.
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