Miniaturized satellites are recent artificial satellites of unusually low weights and small sizes, new classifications are used to categorieze these satellites.
Minisatellite
The term "minisatellite" is sometimes applied to an artificial satellite weighing between 500–200 kg (1100–220 lb), though it is not commonly applied. Minisatellites are usually simpler but use the same technologies as larger satellites.
Microsatellite
Microsatellite or "microsat" is usually applied to the name of an artificial satellite with a weight below 100 kg (220 lb). Sometimes designs or proposed designs of these types have microsatellites working together or in a formation.
Nanosatellite
Nanosatellite or "nanosat" is usually applied to the name of an artificial satellite with a weight below 10 kg (22 lb). Again designs and proposed designs of these types usually have multiple nanosatellites working together or in formation (sometimes the term "swarm" is applied) Some designs require a larger "mother" satellite for communication with ground controllers or for launching and docking with nanosatellites.
Challenges of miniaturization
The reason for miniaturizing satellites is simple: reduce the cost. Heavier satellites require larger rockets of greater cost to finance; smaller and lighter satellites require smaller and cheaper launch vehicles and can sometimes be launched in multiples. Miniaturized satellites also allow for cheaper designs as well as ease of mass production.
Micro/nanosats usually require innovative propulsion, attitude control, communication and computation systems.
Larger satellites usually use monopropellants or bipropellant combustion rockets for propulsion and attitude control, these systems are complex and require a minimal amount of volume to surface area to dissipate heat: to small a vehicle and the heat from the propulsion system will heat up the entire vehicle to damaging levels. Micro/nanosats have to use compressed gas, vaporizable liquids such as butane or carbon dioxide or other innovative propulsion systems that are simple, cheap and scalable.
Tiny satellites lack the power supply or mass for large conventional radio transponders, and have to use miniaturized or innovative communications systems, such a laser receivers, antenna arrays and satellite to satellite comunication networks.
Electronics need to be rigorously tested and modified to be "space hardened" or resistant to the outer space environment. Miniaturized satellites allow for the opportunity to test new hardware with reduce expense in testing.
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