Assertion: antenna | /r/HasProperty | resonant
Facets:
value: to each band
type: TRANSITIVE-OBJECT
value: at a quarter-wavelength
type: TEMPORAL
value: on channel
type: LOCATION
value: in order to transmit well
type: PURPOSE
Source sentences:
text: When the antenna is resonant, the standing waves are fixed in position; when non-resonant, the current and voltage waves drift across each other, always with zero current at the tip, but otherwise with complicated phase relationships that shift along the wire over time.
text: This allows the antenna to be made much shorter than the normal length of a quarter-wavelength, and still be resonant, by cancelling out the capacitive reactance of the short antenna.
text: The radiation at the edges causes the antenna to act slightly larger electrically than its physical dimensions, so in order for the antenna to be resonant, a length of microstrip transmission line slightly shorter than one-half the wavelength at the frequency is used.
text: It is a common misconception that a high standing wave ratio (SWR) per se causes loss, or that an antenna must be resonant in order to transmit well; neither is true.
text: The antenna is resonant at a quarter-wavelength (thus reducing the required space needed on the phone), and also typically has good SAR properties.
text: So we want to make a antenna that is resonant on channel 40 and not too large in size.
text: The coil allows the antenna to be shorter than a quarter wavelength and still be resonant.
text: If the antenna is resonant, and the spring has a large diameter, the impedance will be well below 50 ohms, tending towards zero ohms with large inductors as the structure starts to resemble a series-tuned circuit with little radiation resistance.
text: If the antenna is resonant, and the spring has a small diameter, the impedance will increase towards 70 ohms.
text: Using resonant antennas can be the most fulfilling experience of antenna use, however space and materials can pose a factor in using several antennas that are resonant to each band.
text: At slightly less than 0.5 the antenna has zero imaginary component to the impedance (reactance X=0), and the antenna is said to be resonant.
text: When the antenna is resonant, the standing waves are fixed in position; when non-resonant, the current and voltage waves drift across each other, always with zero current at the tip, but otherwise with complicated phase relationships that shift along the wire over time.