Breast cancer is the leading cause of death among females, early diagnostic methods with\nsuitable treatments improve the 5-year survival rates significantly. Microwave breast imaging has\nbeen reported as the most potential to become the alternative or additional tool to the current gold\nstandard X-ray mammography for detecting breast cancer. The microwave breast image quality is\naffected by the microwave sensor, sensor array, the number of sensors in the array and the size of the\nsensor. In fact, microwave sensor array and sensor play an important role in the microwave breast\nimaging system. Numerous microwave biosensors have been developed for biomedical applications,\nwith particular focus on breast tumor detection. Compared to the conventional medical imaging and\nbiosensor techniques, these microwave sensors not only enable better cancer detection and improve\nthe image resolution, but also provide attractive features such as label-free detection. This paper\naims to provide an overview of recent important achievements in microwave sensors for biomedical\nimaging applications, with particular focus on breast cancer detection. The electric properties of\nbiological tissues at microwave spectrum, microwave imaging approaches, microwave biosensors,\ncurrent challenges and future works are also discussed in the manuscript.
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