the invention provides systems , methods for 14 treatment , and occlusion of the fallopian tube . an elongated catheter is placed into the isthmic region of the fallopian tube in a trans - cervical trans - uterine fashion , and a mono - pole antenna is disposed within a distal end of the catheter . the antenna radiates microwave energy in resonance to a drive frequency into tissue of the isthmic region without physical contact between the mono - pole antenna , and the tissue . this heating causes occlusion after a period of time . typically , the catheter , and the mono - pole antenna are disposable after one treatment . in the preferred embodiment , the antenna is formed from an extension of the inner conductor of a coaxial cable coupled to a microwave generator . a power control section can be used to control , and apply the appropriate microwave power to the fallopian tube tissue . in addition , the invention preferably incorporates a microwave immune thermometry probe within the catheter to measure temperature of the tissue in real time .