Dear Kanimozhi T. ,

The journal “International Journal of Microwave and Wireless Technologies” is a hybrid journal meaning that you can choose for open access (and pay a fee) but if you decline that option then publishing in this journal is free of charge, see also https://www.cambridge.org/core/journals/international-journal-of-microwave-and-wireless-technologies/information/author-instructions/fees-and-pricing

So, in the subscription-based mode the journal is free of costs.

Best regards.

PS. Like more journals this journal has a so-called Green Open Access policy https://www.cambridge.org/core/journals/international-journal-of-microwave-and-wireless-technologies/information/author-instructions/post-publication-impact and for more details https://www.cambridge.org/core/services/open-access-policies/open-access-journals/green-open-access-policy-for-journals This basically says that under certain requirements one can make a version (pre-print, accepted manuscript etc.) of your paper publicly available. See for final details enclosed file.