Following are few unpaid journals of your interest:
1) http://jestec.taylors.edu.my/submit%20a%20paper.html a Journalpeer-reviewed journal, Scopus indexed
2) PIERS SCI-indexed Expanded, and Elsevier's SCOPUS PIERS B, M, C Elsevier's SCOPUS 3) JESTECH, Elsevier (SCOPUS)
4.) http://www.ciitresearch.org/dl/index.php/wc
5.) http://www.tandfonline.com/action/authorSubmission?journalCode=tewa20&page=instructions#mp_subfee SCOPUS; Science Citation Index
6.) http://www.radioeng.cz/info/12-publication-payments.htm Science Citation Index Expanded, SCOPUS
7.) http://www.jestr.org/index.php?option=com_content&view=article&id=38&Itemid=83 SCOPUS Indexed and peer-reviewed
8.) http://www.mdpi.com/journal/electronics/instructions SCOPUS Indexed and peer reviewed
9.) http://www.springerplus.com/ SCI-Expandedpeer-reviewed, receive its first impact factor in June 2016 10.) http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=7260 IEEE Microwave and Wireless Components Letters SCI-Expanded 11.) Journal of Electromagnetic Waves and Applications http://www.tandfonline.com/action/journalInformation?show=abstractingIndexing&journalCode=tewa20#.VqtHAU-bFhs SCI, SCOPUS 12.)
27.) http://www.springer.com/popular/journal/40009 Science Citation Index Expanded (SciSearch), SCOPUS, SCImago
28.) Journal of Computational Electronics http://www.springer.com/engineering/computational+intelligence+and+complexity/journal/10825 Science Citation Index Expanded (SciSearch), SCOPUS, SCImago
29.) International Journal of Antennas and Propagation Hindawi https://www.hindawi.com/journals/ijap/ai/ Science Citation Index Expanded Scopus
30.) Analog Integrated Circuits and Signal Processing http://www.springer.com/engineering/circuits+%26+systems/journal/10470 Science Citation Index, Science Citation Index Expanded (SciSearch), SCImago
32.) Journal of the Institution of Engineers (India): Series B
33.) IETE Journal: Taylor and Francis For Microwaves and VLSI both. SCOPUS indexed
34.) International Journal of Signal and Imaging Systems Engineering SCOPUS
36.) http://www.springer.com/engineering/signals/journal/11487 Journal of Communications Technology and Electronics SCI, Science Citation Index Expanded, SCImago, SCOPUS 37.) http://www.sciencedirect.com/science/journal/10512004 Digital Signal Processing SCOPUS, SCI Expanded 38.) http://www.springer.com/physics/journal/40042Journal of the Korean Physical Society SCI, SCI Expanded, SCImago
39.) http://www.jmoe.org/index.php/jmoe/index Journal of Microwaves, Optoelectronics and Electromagnetic Applications (JMOe) SCOPUS
40.) http://www.springer.com/engineering/signals/journal/11276 Wireless Networks SCI, Science Citation Index Expanded (SciSearch)
41.) http://digital-library.theiet.org/content/journals/el Electronics Letters Inspec®, Science Citation Index®, Ei Compendex®
42.) http://digital-library.theiet.org/content/journals/cje Chinese Journal of Electronics Inspec, SCI-Expanded, Ei Compendex, Scopus
45.) Journal of Circuits, Systems and Computers http://www.worldscientific.com/page/jcsc/submission-guidelines SCI, SCOPUS
46.) International Journal of Communication Systems http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1099-1131/homepage/ProductInformation.html Science Citation Index Expanded (Clarivate Analytics)
47.) International Journal of Circuit Theory and Applications http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-007X/homepage/ProductInformation.html SCI and SCIE
48.) International Journal of Satellite Communications and Networking http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1542-0981/homepage/ProductInformation.html SCI and SCIE
49.)Journal of Microelectronics, Electronic Components and Materials http://www.midem-drustvo.si/Journal/Info.aspx SCISCI-ExpandedSCI-Expanded
For finding any journal related information (like country, publisher, h-index, subject area or scope, ISSN no. etc), you can refer this website:
https://www.scimagojr.com/
For getting review of any particular journal, follow the below link:
https://scirev.org/myreviews/
Here, you can find the time within which you get the reply from a journal, review pattern, overall rating etc. given by various authors like you and me.