CERTIFICATE PURSUANT TO SECTION 302 OF SARBANES - OXLEY ACT OF 2002 FOR CFO

Exhibit 31.2

CERTIFICATION
OF CHIEF FINANCIAL OFFICER

I, Harley E. Barnes III, certify that:

1. I have reviewed the annual report on Form 10-K for the year ended August 31, 2008 of RF Monolithics, Inc., filed with the Securities and Exchange Commission on November 24, 2008 (the Report);

2. Based on my knowledge, the Report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by the Report;

3.
Based on my knowledge, the financial statements, and other financial information included in the Report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the
periods presented in the Report;

4. The registrants other certifying officer and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

a) Designed such
disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us
by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control
over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrants
disclosure controls and procedures and presented in the Report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by the Report based on such evaluation; and

d) Disclosed in the Report any change in the registrants internal control over financial reporting that occurred during the registrants most
recent fiscal quarter (the registrants fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting; and

5. The registrants other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting,
to the registrants auditors and the audit committee of registrants board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the registrants ability to record, process, summarize and
report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a
significant role in the registrants internal control over financial reporting.



|                       |  |                                      
|---------------------- |  | -------------------------------------
|Date: December 5, 2008 |  | /s/ Harley E. Barnes III             
|                       |  | Harley E. Barnes III                 
|                       |  | Chief Executive Officer and President