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WikiCards · Card list · Science cards · Spiral antenna
Common card · Science
Spiral antenna, a Common card
A spiral antenna is a type of radio frequency antenna shaped as a spiral, first described in 1956.
- Rarity
- Common
- Domain
- Science
- ATK
- 53
- DEF
- 27
- Power
- 80
- Wikipedia reads a year
- 9,000
Power 80 (ATK + DEF): stronger than 40 % of WikiCards cards.
The facts on the card
The card carries these facts from its Wikipedia article.
- Archimedean spiral antennas are the most popular, while logarithmic spiral antennas are independent of frequency: the driving point impedance, radiation pattern and polarization of such antennas remain unchanged over a large bandwidth.
- Spiral antennas are inherently circularly polarized with low gain, antenna arrays can be used to increase the gain.
- Spiral antennas are reduced in size with its windings making it an extremely small structure.
Why it is Common
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Spiral antenna article was read about 9,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 53 and blocks with 27: each hit it takes is cut by 11 %.
How to get Spiral antenna
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
More Science cards
Cards close in power
The cards just above and just below Spiral antenna in the power ranking, all domains together.
- Guillaume DuboisCommon · History · ATK 56 DEF 24
- Luke JensenCommon · Society · ATK 58 DEF 22
- Busby Stoop ChairCommon · History · ATK 46 DEF 34
- Bernart de VentadornCommon · Arts · ATK 51 DEF 29
- Yoo Hee-kwanCommon · Society · ATK 53 DEF 27
- Marian ElegantiCommon · Society · ATK 55 DEF 25
Card lists
- All cards from A to ZEvery card, by name
- Nature cards600 cards
- Science cards600 cards
- History cards600 cards
- Arts cards600 cards
- Society cards600 cards
- Tier listS and A tiers by power (ATK + DEF)
- Legendary cards136 cards
- Epic cards262 cards
- Strongest cardsTop 100 by attack
Credits
Text : Wikipedia, Spiral antenna (revision), CC BY-SA 4.0. Photo : Bin im Garten, CC BY-SA 3.0, Wikimedia Commons.
