Multiple realities
(covers information from several alternate timelines)

A Starfleet portable transporter

A portable or mobile transporter was a portable or temporarily placed transporter pad that provided site-to-site transport accessibility where none previously existed. Unlike site-to-site transporters, these devices were large and bulky units. (DS9: "Visionary")

History

In 2259, in the alternate reality, John Harrison was in possession of a bulky portable transwarp beaming device, a type of portable transporter. He used it to beam himself from Earth to Qo'noS. The device itself did not beam along with Harrison, but remained behind and was found and recovered from the wreckage of his jumpship by Montgomery Scott, who identified the device and Harrison's location. (Star Trek Into Darkness)

In 2268, portable transporter array was installed onboard the shuttlecraft Magellan before it entered into null space, during a rescue attempt to retrieve the passengers aboard the J'naii shuttle Taris Murn. (TNG: "The Outcast")

In 2371, Commander Benjamin Sisko theorized that Morka, Atul, and Bo'rak used a portable transporter to place a piece of surveillance equipment in a bulkhead. However, Constable Odo did not believe the Klingon Intelligence personnel would be seen walking through Deep Space 9's corridors with a large device such as a portable transporter. (DS9: "Visionary")

In 2374, Captain Janeway and a holographic recreation of Leonardo da Vinci used a portable transport pad, referred to in this case as a "site-to-site transporter", to escape from Tau, an interstellar pirate in the Delta Quadrant, who had stolen a number of goods from the USS Voyager, including the transporter. (VOY: "Concerning Flight")

Later that year, Harry Kim believed that if mobile transporters were brought to the surface of a class Y planet, enough deuterium to get Voyager "all the way to the Alpha Quadrant and back again" could be mined. (VOY: "Demon")

By the 32nd century, portable transporters were ubiquitous, and were small enough to be worn. They also had the capacity to beam themselves along with the wearer. They could beam much faster than 23rd century transporters, taking only a second for the process to complete, and were harder to trace when rematerializing underwater. (DIS: "That Hope Is You, Part 1")

Furthermore, the device used by Jadzia Dax in 2369, in the episode "The Passenger", to remove Rao Vantika's neural patterns from Doctor Bashir was described as a portable Transporter device in the script. [1]
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