quarter wave การใช้

• The other structure is the quarter wave impedance transformer.
• Exactly half the wavelength gives two quarter wave rods, which provides the best resonant properties.
• Game 2's Reggie did nothing as the Knicks came at his Pacers in retaliatory, third-quarter waves.
• The standard " quarter wave " antenna in the 25-50 MHz range can be over nine feet long.
• For other input polarizations, the net effect of the rhomb is identical to that of a quarter wave plate.
• Pulse trapping and dumping is done using a polarizer and a Pockels cell, which acts like a quarter wave-plate.
• Typically it is adjusted to be either a quarter wave or half wave plate at the peak of the oscillation.
• The most common transmitting antenna, the quarter wave monopole, is physically large at these frequencies ( requiring a tall radio mast.
• These designs can be considered a mass-loaded transmission line design or a bass reflex design, as well as a quarter wave enclosure.
• The quarter wave resonance was calculated to be 1780 Hz, while the measured fundamental was 1625 Hz with detectable second and third harmonics.
• Since the AC output voltage obtained from this modulation technique has odd half and odd quarter wave symmetry, even harmonics do not exist.
• Prada overtook GBR on the first run in the afternoon, riding on its quarter wave then jibing and slipping past close to the leeward mark.
• Suppose we wish to send a 30 MHz signal down a short section of such a cable, and delay it by a quarter wave ( 90?).
• Lower power transmitters often use electrically short quarter wave monopoles such as inverted-L or T antennas, which are brought into resonance with a loading coil at their base.
• They are a practical and higher-gain alternative to quarter wave ground plane antennas used in fixed base stations for mobile two-way radios, such as police, fire, and taxi dispatchers.
• One design for ultra high frequencies ( UHF ) and super high frequencies ( SHF ) is a resonant ? / 4 ( quarter wave ) rod which can vary in length.
• Quarter wave resonators have seen a revival as commercial applications with the onset of neodymium drivers that enable this design to produce relatively low bass extensions within a relatively small speaker enclosure.
• As with a quarter wave transformer, if one of port of the gyrator is terminated with a linear load, then the other port presents an impedance inversely proportional to that of the load,
• Impedance matching ( when C = ? ) to standard 50 or 75 ohm coaxial cable is often done by a quarter wave stripline section acting as an impedance transformer between the helix and the ground plate.
• A long thin wire used as a half-wave dipole ( or quarter wave monopole ) will have a reactance significantly greater than the resistive impedance it has at resonance, leading to a poor match and generally unacceptable performance.