DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA. Claim Rejections - 35 USC § 112 The following is a quotation of 35 U.S.C. 112(b): (b ) CONCLUSION.— The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. The following is a quotation of 35 U.S.C. 112 (pre-AIA), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the appl icant regards as his invention. Claims 1-15 are rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. Claim 1 recites the limitation “ the frequency domain” in lines 12 and 14. There is insufficient antecedent basis for this limitation in the claim. Claim 3 recites the limitation “ the operational frequency band ” in lines 1 2 and 14. There is insufficient antecedent basis for this limitation in the claim. Claim s 5 and 6 recites the limitation “the cross-sectional shape ” in lines 2 and 4 of claim 5 and line 2 of claim 6. There is insufficient antecedent basis for this limitation in the claim . Claim 8 recites the limitation “ the RF performance ” in lines 2. There is insufficient antecedent basis for this limitation in the claim. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Beis EP 085 4532 A2 titled “ Frequency diplexer” . Bunin RU23613351 C1 titled “Diplexer”. Milroy et al US Patent 10,707,550 titled “ High Q dispersion compensated parallel plate diplexer” Schuegraf DE 2912650 A titled “Adjustable microwave frequency band separator has capacitors narrowing bandwidth in blocking waveguide junction with H bend. Any inquiry concerning this communication or earlier communications from the examiner should be directed to FILLIN "Examiner name" \* MERGEFORMAT KIMBERLY E GLENN whose telephone number is FILLIN "Phone number" \* MERGEFORMAT (571)272-1761 . The examiner can normally be reached FILLIN "Work Schedule?" \* MERGEFORMAT M-F 8:00 AM-5:00 PM . Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, FILLIN "SPE Name?" \* MERGEFORMAT Andrea Lindgren Baltzell can be reached at FILLIN "SPE Phone?" \* MERGEFORMAT 571-272-5918 . The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. December 17, 2025 /K. E.G / Examiner, Art Unit 2843 /ANDREA LINDGREN BALTZELL/ Supervisory Patent Examiner, Art Unit 2843