Sanji mara waya karya hanyar da watsa wutar lantarki ke iya dogara ne kawai akan watsa wayoyi kai tsaye. Watsawa ce wadda ba ta tuntuɓar sadarwa ba, kuma tana iya guje wa tartsatsin tuntuɓar juna, zamewar lalacewa, firgita masu fashewa da sauran matsalolin da ƙila ta haifar ta hanyar watsa wutar lantarki. Akwai manyan nau’ikan watsawar rediyo guda uku: shigarwar electromagnetic, resonance electromagnetic da radiation electromagnetic. Shigar da wutar lantarki a halin yanzu shine hanyar watsa wutar lantarki da aka fi amfani da ita. An samar da fasaharta da yawa, tana da arha fiye da sauran fasahohin wajen samar da kayayyaki, kuma an tabbatar da ita ta hanyar tsaro da manyan kantuna. A halin yanzu, akwai manyan kawance guda uku waɗanda aka sadaukar don haɓakawa da daidaitaccen tsarin fasahar caji mara waya, wato Alliance for Wireless Power (A4WP), Power Matters Alliance (PAM) da Wireless Power Consortium (WPC). Ma’aunin Qi shine ma’aunin “cajin mara waya” don WPC, wanda ke amfani da mafi yawan fasahar cajin cajin lantarki a halin yanzu. Ma’aunin Qi shine galibi don samfuran lantarki masu ɗaukuwa kamar kyamarori, bidiyo da masu kunna kiɗa, kayan wasan yara, kulawar sirri da wayoyin hannu. A halin yanzu, bincike da ƙirar caja mara igiyar wuta mara ƙarfi galibi don cajin waya mara waya. Dukkansu sun dogara ne akan guntu na musamman na kamfanin TI na BQ500211. A wasu ƙananan tashoshi masu ƙarfi, ana kuma amfani da guntu na musamman. Yin amfani da guntu mai haɗawa na musamman a cikin ci gaban farko zai iya adana lokacin haɓaka, amma a cikin dogon lokaci, bai dace da rage farashi ba kuma daga baya haɓakawa da haɓakawa.
Kodayake fasahar caji mara waya ta sami ɗan ci gaba, har yanzu akwai wasu matsalolin fasaha masu wahala a cikin tsarin ci gaba. Na farko, ingancin caji ba shi da yawa. Da zarar ɗan nesa kaɗan, ingancin caji yana raguwa sosai, yana ɓata lokaci da albarkatu don kammala caji, don haka ba shi da mahimmancin amfani. Abu na biyu, matsalar tsaro yayin aiwatar da caji. Na’urar caji mara waya mai ƙarfi za ta samar da babban adadin electromagnetic radiation, wanda zai haifar da mummunan tasiri ga lafiya, amma kuma zai yi tasiri a kan jiragen sama, sadarwa da sauransu. Na uku, fannoni masu amfani. Za’a iya samun fasahar caji mara waya ta yanzu ta hanyar gyara ta a wani wuri, wanda bai dace ba kuma a aikace. Na hudu, yana da tsada sosai, saboda fasahar cajin waya har yanzu tana cikin matakin farko na haɓakawa da aikace-aikace, kuma farashin bincike yana da yawa, don haka farashin samfuran bincike da haɓaka yana da yawa.

Wutar Injiniya
Wannan ita ce hanyar da aka fi amfani da ita ta yin aiki da caja mara waya. Yana amfani da ƙa’idar shigarwa na lantarki don samar da halin yanzu ta hanyar shigar da wutar lantarki tsakanin murfin firamare da sakandare, don haka yana ba da damar watsa makamashi a cikin kewayon sararin samaniya. An inganta aiwatar da wannan cajar mara waya ta Wireless Charging Alliance.

Ruwan rediyo
Wave rediyo babbar hanya ce ta caji mara waya don caja mara waya a wannan matakin. Ka’idar aikinsa ita ce amfani da madaidaiciyar madaidaiciyar madaidaiciyar hanya don ɗaukar raƙuman rediyo a sararin samaniya, sannan canza juzu’in wutar lantarki zuwa kuzari mai ƙarfi. Tuni akwai kamfanonin da ke iƙirarin cewa za su iya cajin na’urori na lantarki ba tare da waya ba fiye da wayoyin tafi -da -gidanka ‘yan mitoci kaɗan.

Electromagnetic resonance
Wannan fasaha ce ta caji mara waya wacce har yanzu tana kan ci gaba kuma ƙungiyar da ke ƙarƙashin jagorancin farfesa a fannin kimiyyar lissafi a Cibiyar Fasaha ta Massachusetts. Injiniyoyi a Intel bisa wannan fasaha sun sami kwan fitila mai nauyin 60W wanda ya kai kimanin mita daya daga wutar lantarki da kuma ingancin watsawa kashi 75%. Injiniyoyin Intel sun ce burinsu na gaba shine su yi cajin kwamfutar tafi-da-gidanka da aka gyara ta hanyar amfani da wannan fasahar caji mara waya. Duk da haka, don cimma wannan buri, ana buƙatar magance kutse da tasirin filayen lantarki akan sauran abubuwan da ke cikin kwamfutar.