Exhibit 99.1


      CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
                                  PURSUANT TO
                            18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                 SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      I, Tamer Husseini, certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the  Sarbanes-Oxley  Act of 2002,  that the Quarterly
Report of Celeritek,  Inc. on Form 10-Q for the quarterly period ended September
30, 2002 fully complies with the  requirements  of Section 13(a) or 15(d) of the
Securities Exchange Act of 1934 and that information contained in such Quarterly
Report  fairly  presents in all material  respects the  financial  condition and
results of operations of Celeritek, Inc.

      By: /s/ TAMER HUSSEINI
          ------------------

      Name:     Tamer Husseini
            ----------------------

      Title: Chief Executive Officer

      I, Margaret Smith, certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the  Sarbanes-Oxley  Act of 2002,  that the Quarterly
Report of Celeritek,  Inc. on Form 10-Q for the quarterly period ended September
30, 2002 fully complies with the  requirements  of Section 13(a) or 15(d) of the
Securities Exchange Act of 1934 and that information contained in such Quarterly
Report  fairly  presents in all material  respects the  financial  condition and
results of operations of Celeritek, Inc.

      By: /s/ MARGARET E. SMITH
          ---------------------

      Name:     Margaret E. Smith
            -------------------------

      Title: Chief Financial Officer