PIP-II LLRF Upconverters 325MHz and 650MHz RF Filters Specification.pdf

PDF 443 KB Posted May 28, 2026

Attached to: PIP-II Upconverter Filters
Solicitation number: 382117swk
Issued by: Department of Energy Fermi National Accelerator Laboratory

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Written by GovTribe AI · May 28, 2026

This is a Product Specification document for RF bandpass filters required for the PIP-II Low-Level RF (LLRF) RF Station Upconverters at Fermi National Accelerator Laboratory.

The specification defines procurement requirements for two line items: Item A consists of 76 units of 325 MHz narrow-band bandpass filters, and Item B consists of 88 units of 650 MHz narrow-band bandpass filters. Both filters must be production-quality units suitable for integration into 50-ohm RF systems with acceptance test data provided for each delivered lot. The 325 MHz filter must deliver a 10 MHz 3 dB bandwidth (9.5-10.5 MHz acceptable range) with insertion loss ≤1.8 dB, passband ripple ≤1.0 dB, and VSWR ≤1.5:1. The 650 MHz filter must provide 13.5 MHz nominal equiripple usable bandwidth with insertion loss ≤1.5 dB and matching VSWR specifications. Both filters require minimum 5 W CW average power handling, tuned and locked center frequency within ±0.1%, and out-of-band rejection equal to or better than 3-section and 5-section high-Q cavity designs respectively. Mechanical requirements include SMA female connectors, rugged metal RF-shielded housings, compact cavity-filter compatible designs with outline drawings, and permanent marking with part number, serial/lot number, frequency, and manufacturer identification. Environmental specifications include operating temperature -20°C to +50°C, storage temperature -40°C to +85°C, and shock/vibration qualification preferred at 20 G half-sine and 10 G across 10 Hz to 2000 Hz. Suppliers must provide completed compliance matrices, S-parameter plots, mechanical drawings, manufacturing lead times, unit and lot pricing, warranty terms, and acceptance test plans with Touchstone .s2p data format preferred. AS9100 or ISO 9001 quality systems and RoHS/REACH compliance with certificate of conformance are preferred.

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Product Specification | Fermi Forward Discovery Group (FFDG)

PIP-II LLRF RF Station- Upconverters RF Filters

Specification for 325MHz and 650MHz Bandpass Filters

Ahmed Syed RF Staff Engineer-II

Specification Document for PIP-II LLRF RF Station- Upconverters RF Filters Ahmed Syed, FNAL

Fermi National Accelerator Laboratory 2

Contents

1. Purpose 3

2. Scope 3

3. Approved Reference or Equal 3

4. RF Performance Requirements 3

5. Mechanical and Interface Requirements 4

6. Environmental and Quality Requirements 4

7. Required Bid Submittals 4

Fermi National Accelerator Laboratory 3

1. Purpose

This specification defines two high-Q RF bandpass filters for competitive procurement.

2. Scope

The supplier shall furnish high-Q bandpass filters for the two line items below. The filters shall be production-quality units suitable for integration into 50-ohm RF systems and shall include acceptance test data for each delivered lot, with serialized data preferred when available.

• Item A: 325 MHz narrow-band bandpass filter, quantity 76 each.

• Item B: 650 MHz narrow-band bandpass filter, quantity 88 each.

Required bid basis: quote each item separately, include lead time ARO, technical compliance matrix, exceptions, and supporting data sheets or predicted/measured plots.

3. Approved Reference or Equal

A bid shall be considered technically acceptable only if it meets all mandatory requirements.

Better performance includes lower insertion loss, lower VSWR, higher rejection/selectivity, better ripple in pass band and stop band, smaller or more robust mechanical packaging, better environmental qualification, faster delivery, or lower evaluated total cost without reducing technical compliance.

4. RF Performance Requirements

Requirement Item A: 325 MHz filter Item B: 650 MHz filter

Filter type High-Q RF bandpass filter or equivalent technology acceptable

High-Q RF bandpass filter or equivalent technology acceptable

Center frequency 325 MHz nominal; tuned center shall be within ±0.1% unless otherwise approved

650 MHz nominal; tuned center shall be within ±0.1% unless otherwise approved

Usable passband / bandwidth 10 MHz 3 dB bandwidth nominal; acceptable 9.5 to 10.5 MHz at 3 dB points

13.5 MHz nominal equiripple usable bandwidth;

bidder shall state equivalent 3 dB bandwidth and passband limits

Passband ripple ≤ 1.0 dB across usable passband; lower is preferred

≤ 1.0 dB across usable passband; lower is preferred

Insertion loss at center frequency ≤ 1.8 dB maximum; lower is preferred ≤ 1.5 dB maximum; lower is preferred

VSWR / return loss VSWR ≤ 1.5:1 across usable passband, equivalent return loss ≥ 14 dB

VSWR ≤ 1.5:1 across usable passband, equivalent return loss ≥ 14 dB

Impedance 50 ohms nominal 50 ohms nominal

RF power handling ≥ 5 W CW average minimum without performance degradation

≥ 5 W CW average minimum without performance degradation

Out-of-band rejection Bidder shall provide predicted or measured rejection plot. Rejection/selectivity shall be equal or better than a 3-section high-Q cavity bandpass design of this bandwidth.

Bidder shall provide predicted or measured rejection plot. Rejection/selectivity shall be equal or better than a 5-section high-Q cavity bandpass design of this bandwidth.

Stability and tuning Filter shall be tuned and locked for shipment; no field tuning required unless explicitly approved

Filter shall be tuned and locked for shipment; no field tuning required unless explicitly approved

Fermi National Accelerator Laboratory 4

5. Mechanical and Interface Requirements

Requirement Item A Item B

RF connectors SMA female input and SMA female output required, 50-ohm interface

SMA female input and SMA female output required, 50-ohm interface

Connector orientation Preferred inline opposing connectors unless alternate orientation is approved by project

Preferred inline opposing connectors unless alternate orientation is approved by project

Package Rugged machined metal housing or equivalent RF-shielded enclosure

Rugged machined metal housing or equivalent RF-shielded enclosure

Size

Shall be compatible with a compact cavity-filter installation; bidder shall provide outline drawing. Smaller equal/better packages are preferred.

Mounting Bidder shall provide mounting hole pattern and recommended mounting hardware; no special tools for installation preferred

Bidder shall provide mounting hole pattern and recommended mounting hardware; no special tools for installation preferred

Marking Each unit shall be permanently marked with part number, serial or lot number, frequency, and manufacturer identification

Each unit shall be permanently marked with part number, serial or lot number, frequency, and manufacturer identification

6. Environmental and Quality Requirements

• Operating temperature: -20 °C to +50 °C minimum. Wider operating range is preferred.

• Storage temperature: -40 °C to +85 °C minimum unless bidder proposes and justifies an alternate range.

• Relative humidity: 0% to 95% non-condensing minimum.

• Shock and vibration: bidder shall state qualification level. Preference will be given to filters meeting or exceeding 20 G half-sine shock and 10 G vibration from 10 Hz to 2000 Hz, or equivalent project-approved qualification.

• Quality system: supplier shall state applicable quality registrations and inspection controls.

AS9100 or ISO 9001 quality systems are preferred.

• Compliance: supplier shall state RoHS/REACH status and any exceptions. Certificate of conformance is required with shipment.

7. Required Bid Submittals

• Completed compliance matrix against every requirement in this specification, including any exceptions or clarifications.

• Manufacturer and part number proposed for each item, with data sheet or custom specification sheet.

• Predicted or measured S-parameter plots covering insertion loss, return loss/VSWR, and rejection over a frequency span wide enough to evaluate selectivity.

• Mechanical outline drawing with dimensions, connector type, connector orientation, mounting features, and mass if available.

Fermi National Accelerator Laboratory 5

• Manufacturing lead time ARO, unit price, lot price, minimum order quantity, warranty, and validity period of quote.

• Acceptance test plan and delivered documentation package, including certificate of conformance and test data format. Touchstone .s2p data is preferred.