Split Rings
What is a split-ring resonantor used in meta-materials?
Metamaterial antennas are a class of antennas which use metamaterials to enhance or increase performance of the antenna system. Applying metamaterials to increase performance of antennas has garnered much interest. Demonstrations have shown that metamaterials could enhance the radiated power of an antenna. Materials which can attain negative magnetic permeability could possibly allow for properties such as an electrically small antenna size, high directivity, and tunable operational frequency, including an array system. Furthermore, metamaterial based antennas can demonstrate improved efficiency-bandwidth performance.
Metamaterials are manufactured materials that exhibit properties not found in nature. A significant improvement in antenna performance is predicted for a class of metamaterials exhibiting a negative electric permittivity, (ENG), a negative magnetic permeability (MNG), or both (ENG/MNG). See:epsilon-negative (ENG) and mu-negative (MNG).
Antennas employing metamaterials offer the revolutionary potential of overcoming restrictive efficiency-bandwidth limitations for natural or conventionally constructed, electrically small antennas. Metamaterial antennas, if successful, would allow smaller antenna elements that cover a wider frequency range, thus making better use of available space for small platforms or spaces.
Metamaterials employed in the ground planes surrounding antennas offers improved isolation between radio frequency or microwave channels of (multiple-input multiple-output) (MIMO) antenna arrays. Metamaterial, high-impedance groundplanes can also be used to improve the radiation efficiency, and axial radio performance of low-profile antennas located close to the ground plane surface. Metamaterials have also been used to increase the beam scanning range by using both the forward and backward waves in leaky wave antennas. Various metamaterial antenna systems can be employed to support surveillance sensors, communication links, navigation systems, command and control systems.
Another notable characteristic is that negative refractive index, produced by metamaterials, results in electromagnetic radiation being focused by a flat lens versus being dispersed. These combinations of unique properties could enable noteworthy levels of RF/optical device and antenna miniaturization. Other combinations, for other devices in metamaterial antenna subsystems are being researched. Either double negative metamaterial slabs are used exclusively or combinations of double positive (DPS) with DNG slabs, or epsilon-negative (ENG) slabs with mu-negative (MNG) slabs are employed in the subsystems. The antenna subsystems that are currently being researched are cavity resonators, waveguides, scatters, and antennas (radiators). In addition, metamaterial antennas are already (2009) commercially available.
http://en.wikipedia.org/wiki/Metamaterial_antennas
 |
 12pcs 24mm 1 METAL Key Rings SPLIT RINGS Keychains $1.99 Time Remaining: 2h 27m Buy It Now for only: $1.99 |
 10 KEY RINGS 24mm 1 Split Ring Silver NEW $2.56 Time Remaining: 3d 4h 16m |
 10 KEY RINGS 24mm 1 Split Ring Silver NEW $0.99 Time Remaining: 3d 7h 12m |
 KAIJIN FLAT BRASS FISHHOOK Key Chain with 28mm Split Ring Japan Fob Snap $22.00 Time Remaining: 4d 6h 49m Buy It Now for only: $22.00 |
 100 Nickel 1 Inch Round Key Chain Split Rings Craft $10.99 Time Remaining: 5d 2h 22m Buy It Now for only: $10.99 |
 20 Big Gold Plated Heart Shaped Key Chain Split Rings $13.99 Time Remaining: 5d 2h 24m Buy It Now for only: $13.99 |
 10 KEY RINGS 24mm 1 Split Ring Silver NEW $2.56 Time Remaining: 5d 4h 24m |
 10 KEY RINGS 24mm 1 Split Ring Silver NEW $0.99 Time Remaining: 5d 7h 14m |
 4 Nickel 1 Inch Round Key Chain Split Rings Kids Craft $1.00 Time Remaining: 5d 8h Buy It Now for only: $1.00 |
 LOT 100 YELLOW COLOR KEY RINGS keyrings 24mm Split ring $6.99 Time Remaining: 5d 18h 57m Buy It Now for only: $6.99 |
 LOT 100 GREEN COLOR KEY RINGS keyrings 24mm Split ring $6.99 Time Remaining: 5d 18h 58m Buy It Now for only: $6.99 |
 100 BRASS 24mm KEY RINGS keyrings GOLD Split ring $6.99 Time Remaining: 5d 19h 1m Buy It Now for only: $6.99 |
 50pcs Metal Split Key Rings 25mm Silver Tone Craft $7.29 Time Remaining: 7d 7h 43m Buy It Now for only: $7.29 |
 1 Inch Round Split Key Chain Rings $4.99 Time Remaining: 12d 8h 30m Buy It Now for only: $4.99 |
 24mm Metallic Blue Split Key Ring Charm $1.29 Time Remaining: 14d 4h 48m Buy It Now for only: $1.29 |
 24mm Metallic Green Split Key Ring Charm $1.29 Time Remaining: 14d 4h 54m Buy It Now for only: $1.29 |
 10 Key Rings Split Ring Double Swivel Link DIY R594 $3.99 Time Remaining: 17d 21h 22m Buy It Now for only: $3.99 |
 10 Key Rings Round Split Ring 33mm Nickel For DIY R599 $3.99 Time Remaining: 17d 21h 44m Buy It Now for only: $3.99 |
 15 Key Rings Split Ring 25mm With Chain For DIY R600 $3.99 Time Remaining: 17d 21h 47m Buy It Now for only: $3.99 |
 40 Small Round Rings Split Ring 20mm Accessories R604 $3.99 Time Remaining: 17d 22h 12m Buy It Now for only: $3.99 |
 8 Key Rings Round Split Ring 35mm Nickel For DIY R605 $3.99 Time Remaining: 17d 22h 15m Buy It Now for only: $3.99 |
 10 Key Rings Round Split Ring 32mm Nickel For DIY R606 $3.99 Time Remaining: 17d 22h 18m Buy It Now for only: $3.99 |
 10 Round Rings Split Ring 40mm Nickel For DIY R610 $3.99 Time Remaining: 17d 22h 36m Buy It Now for only: $3.99 |
 10 Key Ring 32mm Split Ring Double Swivel Link DIY R617 $3.99 Time Remaining: 17d 22h 59m Buy It Now for only: $3.99 |
 30 Round Rings Split Ring 20mm With Chain For DIY R620 $4.29 Time Remaining: 17d 23h 6m Buy It Now for only: $4.29 |
 15 Key Rings Split Ring With Chain DIY Accessories R621 $3.99 Time Remaining: 17d 23h 13m Buy It Now for only: $3.99 |
 15 Key Rings 28mm Split Ring Chain DIY Accessories R623 $4.29 Time Remaining: 18d 20h 39m Buy It Now for only: $4.29 |
 25 Key Rings Split Ring 23mm With Chain For DIY R596 $4.29 Time Remaining: 19d 7h 21m Buy It Now for only: $4.29 |
 1 Heart Shaped Split Key Ring Nickel 100pcs $37.00 Time Remaining: 21d 5h 30m Buy It Now for only: $37.00 |
 1 Split Key Ring Nickel 100pcs $19.00 Time Remaining: 21d 5h 31m Buy It Now for only: $19.00 |
 1 Split Key Ring Gold 100pcs $22.00 Time Remaining: 21d 5h 32m Buy It Now for only: $22.00 |
 1 Split Key Ring Antique Brass 100pcs $19.00 Time Remaining: 21d 5h 32m Buy It Now for only: $19.00 |
 1 Split Key Ring Black Nickel 100pcs $20.00 Time Remaining: 21d 5h 33m Buy It Now for only: $20.00 |
 Lot of 175 Split Ring Keyring 1 diameter $8.25 Time Remaining: 22d 12h 11m Buy It Now for only: $8.25 |
 5pcs 31mm Flat Star Split Key Rings Key Chain Jump KR06 $2.99 Time Remaining: 23d 49m Buy It Now for only: $2.99 |
 1 Split Key Ring Nickel 10pcs $5.50 Time Remaining: 23d 4h 10m Buy It Now for only: $5.50 |
 1 Split Key Ring Nickel 30pcs $9.00 Time Remaining: 23d 4h 11m Buy It Now for only: $9.00 |
 1 Split Key Ring Nickel 50pcs $13.50 Time Remaining: 23d 4h 24m Buy It Now for only: $13.50 |
 1 Split Key Ring Gold 10pcs $5.80 Time Remaining: 23d 4h 29m Buy It Now for only: $5.80 |
 1 Split Key Ring Gold 30pcs $9.90 Time Remaining: 23d 4h 41m Buy It Now for only: $9.90 |
 1 Split Key Ring Gold 50pcs $15.00 Time Remaining: 23d 4h 42m Buy It Now for only: $15.00 |
 1 Split Key Ring Antique Brass 10pcs $5.50 Time Remaining: 23d 4h 44m Buy It Now for only: $5.50 |
 1 Split Key Ring Antique Brass 30pcs $9.00 Time Remaining: 23d 4h 45m Buy It Now for only: $9.00 |
 1 Split Key Ring Antique Brass 50pcs $13.50 Time Remaining: 23d 4h 45m Buy It Now for only: $13.50 |
 1 Split Key Ring Black Nickel 10pcs $5.50 Time Remaining: 23d 4h 57m Buy It Now for only: $5.50 |
 1 Split Key Ring Black Nickel 30pcs $9.00 Time Remaining: 23d 4h 59m Buy It Now for only: $9.00 |
 1 Split Key Ring Black Nickel 50pcs $13.50 Time Remaining: 23d 5h Buy It Now for only: $13.50 |
 1 Heart Shaped Split Key Ring Nickel 10pcs $9.50 Time Remaining: 23d 5h 2m Buy It Now for only: $9.50 |
 1 Heart Shaped Split Key Ring Nickel 30pcs $19.20 Time Remaining: 23d 5h 4m Buy It Now for only: $19.20 |
 1 Heart Shaped Split Key Ring Nickel 50pcs $26.50 Time Remaining: 23d 5h 4m Buy It Now for only: $26.50 |
 Split Rings16mm nickel 100 Pcs Free Ship USA $7.50 Time Remaining: 24d 22h 47m Buy It Now for only: $7.50 |
 50pcs Metal Split Key Rings 25mm Silver Tone Craft $7.29 Time Remaining: 26d 17h 27m Buy It Now for only: $7.29 |
 50 1 split rings O rings for keychain ring SILVER $6.49 Time Remaining: 28d 2h 53m Buy It Now for only: $6.49 |