The Soviet Union has resumed bombarding the U.S. Embassy in Moscow with low-intensity beams of microwave radiation, the State Department said yesterday.

"Microwave signals in the 5-11 GHz {gigahertz} range continue to be detected at the Moscow Embassy chancery," the department said in statement issued by its Bureau of Diplomatic Security.

The statement marked the department's first status report on the still-unexplained radiation problem since Nov. 10, 1983, when then-Ambassador Arthur A. Hartman told reporters in Moscow that a microwave beam in operation between July 14 and Oct. 19, 1983, had been protested to the Soviet Foreign Ministry.

Yesterday's statement did not specify when the microwave signals resumed.

"The Department of State is not in a position to answer this question, because any response would be speculation," the statement said.

In past years, such speculation has included Soviet efforts to try to foil U.S. electronic intelligence-gathering operations in Moscow, use of the beams in connection with Soviet eavesdropping devices planted in the embassy, or attempts to induce behavioral and physiological effects among U.S. personnel at the embassy.

"The microwave signal power levels are typically 0.1 microwatt per square centimeter external to the building," the statement said. "Measurements internal to the building are typically less than 0.01 microwatt per square centimeter."

The U.S. voluntary safety standard for exposure to microwave radiation is 5,000 microwatts per square centimeter.