content: <PAGE>
  
                         SECURITIES AND EXCHANGE COMMISSION
                              Washington, D. C.  20549
  
                                      FORM 8-K
  
                                   CURRENT REPORT
  
                       Pursuant to Section 13 or 15(d) of the
                          Securities Exchange Act of 1934
  
          Date of Report (Date of earliest event reported):  May 21, 2001
  
                           ADAPTIVE BROADBAND CORPORATION
               (Exact name of registrant as specified in its charter)
  
                                      Delaware
                              (State of incorporation)
  
       000-7428                                              94-1668412
  (Commission File No.)                          (IRS Employer Identification No.)
  
                                1143 BORREGAS AVENUE
                            SUNNYVALE, CALIFORNIA 94089
               (Address of principal executive offices and zip code)
  
         Registrant's telephone number, including area code: (408) 732-4000
  
  
                    -------------------------------------------
  
  <PAGE>
  
  Item 5.  Other Events.
  
        Adaptive Broadband Corporation (the "Company") announced that it was
  advised by Nasdaq on May 21, 2001 that its securities would be delisted from the
  Nasdaq Stock Market effective with the open of business on May 22, 2001.  The
  Company currently intends to request a review of Nasdaq's delisting decision as
  permitted by Nasdaq's rules. The Company is not able to provide assurance that
  any request for review that it may make will be successful. The Company's press
  release dated May 22, 2001, entitled "Adaptive Broadband Announces Nasdaq
  Delisting," is attached hereto as Exhibit 99.1.
  
  Item 7.  Exhibits.
  
        99.1  Press Release, dated May 22, 2001, entitled "Adaptive Broadband
              Announces Nasdaq Delisting."
  
                                         1
  <PAGE>
  
                                     SIGNATURE
  
       Pursuant to the requirements of the Securities Exchange Act of 1934, the
  registrant has duly caused this report to be signed on its behalf by the
  undersigned, thereunto duly authorized.
  
                                      Adaptive Broadband Corporation
  
  Dated:  May 22, 2001                By: /s/  Kenneth J. Wees
                                         ---------------------------------
                                         Kenneth J. Wees
                                         Vice President, General Counsel
                                         and Secretary
  
                                         2
  <PAGE>
  
                                 INDEX TO EXHIBITS
  
  
        99.1  Press Release, dated May 22, 2001, entitled "Adaptive Broadband
              Announces Nasdaq Delisting."
  
                                         3
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metadata_filer: {"company-data": {"conformed-name": "ADAPTIVE BROADBAND CORP", "cik": "0000016357", "assigned-sic": "3663", "irs-number": "941668412", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-07428", "film-number": "1645763"}, "business-address": {"street1": "1143 BORREGAS AVE", "city": "SUNNYVALE", "state": "CA", "zip": "94089", "phone": "4087324000"}, "mail-address": {"street1": "ADAPTIVE BROADBAND CORPORATION", "street2": "1143 BORREGAS AVE", "city": "SUNNYVALE", "state": "CA", "zip": "94089"}, "former-company": {"former-conformed-name": "CALIFORNIA MICROWAVE INC", "date-changed": "19920703"}}
text: SECURITIES AND EXCHANGE COMMISSION
                              Washington, D. C.  20549
  
                                      FORM 8-K
  
                                   CURRENT REPORT
  
                       Pursuant to Section 13 or 15(d) of the
                          Securities Exchange Act of 1934
  
          Date of Report (Date of earliest event reported):  May 21, 2001
  
                           ADAPTIVE BROADBAND CORPORATION
               (Exact name of registrant as specified in its charter)
  
                                      Delaware
                              (State of incorporation)
  
       000-7428                                              94-1668412
  (Commission File No.)                          (IRS Employer Identification No.)
  
                                1143 BORREGAS AVENUE
                            SUNNYVALE, CALIFORNIA 94089
               (Address of principal executive offices and zip code)
  
         Registrant's telephone number, including area code: (408) 732-4000
  
                    -------------------------------------------
  Item 5.  Other Events.
  
        Adaptive Broadband Corporation (the "Company") announced that it was
  advised by Nasdaq on May 21, 2001 that its securities would be delisted from the
  Nasdaq Stock Market effective with the open of business on May 22, 2001.  The
  Company currently intends to request a review of Nasdaq's delisting decision as
  permitted by Nasdaq's rules. The Company is not able to provide assurance that
  any request for review that it may make will be successful. The Company's press
  release dated May 22, 2001, entitled "Adaptive Broadband Announces Nasdaq
  Delisting," is attached hereto as Exhibit 99.1.
  
  Item 7.  Exhibits.
  
        99.1  Press Release, dated May 22, 2001, entitled "Adaptive Broadband
              Announces Nasdaq Delisting."
  
                                         1
  SIGNATURE
  
       Pursuant to the requirements of the Securities Exchange Act of 1934, the
  registrant has duly caused this report to be signed on its behalf by the
  undersigned, thereunto duly authorized.
  
                                      Adaptive Broadband Corporation
  
  Dated:  May 22, 2001                By: /s/  Kenneth J. Wees
                                         ---------------------------------
                                         Kenneth J. Wees
                                         Vice President, General Counsel
                                         and Secretary
  
                                         2
  INDEX TO EXHIBITS
  
        99.1  Press Release, dated May 22, 2001, entitled "Adaptive Broadband
              Announces Nasdaq Delisting."
  
                                         3