Part · radio

Patterned SAW wafer

Pattern interdigital electrodes and reflectors on a selected piezoelectric wafer Discovery hypothesis; caller demands and physical qualification remain open.

Discovered · unresearchedClosure: OpenInventory incomplete

Capability requirements and tolerances

Consumer-specific numerical targets, quantities and acceptance limits remain open or incompletely reviewed. No smartphone-grade suitability is claimed. Distinct capability tiers require their own making route and qualification.

Making steps · draft selected for navigation; not a validated fabrication specification.

Known Parts and Tools

The selected route supplies this page's inventory and the map's dependency links from one record. Further requirements may be missing; review flags do not prove physical suitability.

Requirement	Role	Use	Relationship status
Piezoelectric filter wafer	Part	incorporated; allocation and losses open	Cycle-checked; compatibility unknown
Exposure equipment	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Reticle/master pattern	Part	incorporated; allocation and losses open	Cycle-checked; compatibility unknown
Photoresist	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Photoresist developer	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Etching equipment	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Deposition equipment	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Interconnect deposition stock	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Vacuum systems	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Gas handling	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Cooling systems	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Regulated power	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Probe leads	Part	incorporated; allocation and losses open	Cycle-checked; compatibility unknown
Cleanroom	Tool	reused facility/utility capacity; earlier supply required	Cycle-checked; compatibility unknown
Cleaning equipment	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Pure water	Part	consumed; replenishment and waste open	Cycle-checked; compatibility unknown
Ventilation	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Workshop surfaces	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Containers	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Handling assembly	Tool	reused fabrication equipment; availability unqualified	Cycle-checked; compatibility unknown
Radio test equipment	Tool	reused for verification/calibration; independent origin required	Cycle-checked; compatibility unknown

Making outline

Choose one SAW resonator/filter layout and piezoelectric orientation.
Deposit and pattern electrode/reflector metal on the accepted wafer.
Inspect pattern and characterize witness devices before dicing.

What remains unresolved

Crystal cut, electrode alloy/thickness, temperature compensation and band design unchosen.
Full inventory, quantities, losses, capability compatibility and acceptance remain unreviewed.

Sources and leads

Source scope and research notes determine which claims have been checked. A URL does not establish a complete making route.

Murata SAW structure and manufacturing

Canonical reuse assessment

{
  "existing_candidates_checked": [
    "rf-filter-die",
    "processed-rf-cmos-wafer",
    "piezoelectric-filter-wafer"
  ],
  "decision": "Lithographic SAW output differs from bare piezo wafer and CMOS transistor wafer.",
  "availability": "No candidate is asserted built or suitable; qualification, copies, cleanliness and schedule remain open.",
  "identity_search": "Canonical IDs, aliases/functions and all JSON proposals searched before new ID request; approved for staging by coordinator."
}

Proposed capability specification

{
  "function": "Pattern interdigital electrodes and reflectors on a selected piezoelectric wafer",
  "quantity_dimensions": "not yet specified",
  "performance_precision_purity": "not yet specified",
  "interfaces_environment": "not yet specified",
  "acceptance": "Trial pieces must meet caller demand with independent references; numerical limits not yet specified."
}

Earlier research provenance

proposals/2026-10-08-discovery/camera-rf/report.md; coordinator candidate-union revision 2

Return to the discovered map

Used by

Items that directly require this item in their selected inventory.

Radio acoustic filter die

Paths from Smartphone

These routes together include every item that can lead from Smartphone to this item. Repeated path combinations are collapsed; recipes are omitted.

Shortest route: Smartphone → Main board → Board passives → Radio filters and duplexers → Radio acoustic filter die → Patterned SAW wafer

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