There are definitely devices that can connect a wired Ethernet device to a wireless network, but there's no reason to assume that any such device would give you a more stable connection to the wireless network than the built-in wireless interfaces on the devices you already own. The radio and antennas in such wired->wireless Ethernet adapter could be just as crappy as the radio and antennas in your laptop or tablet or smartphone.
The only clear advantage of using such a device is when the place you like to sit when working on your laptop is a place where the signal is poor. You could position the wired->wireless Ethernet adapter in a place where you know it always gets good signal, and then run a long Ethernet cable from it to wherever you want to sit when actually working on your laptop.