Add RF antenna verify and design recipe to Impedance tab.

Detect matching toward ANT*/ANT_FEED, compute 50 Ω feed width from stackup, and optional λ/4 length from f0 — before auto-draw or F2 packing.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/lib/api.ts

@@ -14,6 +14,7 @@ import type {
   ImpedanceNetsReport,
   ImpedanceStackupResult,
   ImpedanceTraceResult,
+  AntennaReport,
   EdifSubDesign,
   FindingComment,
   FindingReview,
@@ -725,6 +726,46 @@ export async function analyzeImpedanceNets(
   return res.json();
 }
 
+export async function fetchAntennaReport(
+  projectId: string,
+): Promise<AntennaReport> {
+  const res = await authFetch(`${BASE}/api/projects/${projectId}/antenna`);
+  if (!res.ok) {
+    const detail = await res.json().catch(() => ({ detail: res.statusText }));
+    throw new Error(
+      typeof detail.detail === "string" ? detail.detail : "Antenna report failed",
+    );
+  }
+  return res.json();
+}
+
+export async function designAntenna(
+  projectId: string,
+  body: {
+    f0_mhz?: number | null;
+    target_z_ohm?: number;
+    h?: number | null;
+    er?: number | null;
+    t?: number | null;
+  },
+): Promise<AntennaReport> {
+  const res = await authFetch(
+    `${BASE}/api/projects/${projectId}/antenna/design`,
+    {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(body),
+    },
+  );
+  if (!res.ok) {
+    const detail = await res.json().catch(() => ({ detail: res.statusText }));
+    throw new Error(
+      typeof detail.detail === "string" ? detail.detail : "Antenna design failed",
+    );
+  }
+  return res.json();
+}
+
 export async function fetchReport(
   projectId: string,
 ): Promise<ValidationReport> {

frontend/src/lib/types.ts

@@ -451,6 +451,52 @@ export interface ImpedanceNetsReport {
   skipped: string | null;
 }
 
+export interface AntennaVerifyRow {
+  ic_ref: string;
+  pin: string;
+  net: string;
+  topology: string;
+  parts: string[];
+  target_z_ohm: number;
+  status: "ok" | "warning" | "info";
+  detail: string;
+  feed_z0?: number | null;
+  feed_length_mm?: number | null;
+  marker_ref?: string | null;
+}
+
+export interface AntennaDesignRecipe {
+  status: "ready" | "need_pcb" | "need_stackup" | "need_marker";
+  feed_point?: Record<string, unknown> | null;
+  feed_line?: {
+    kind: string;
+    target_z_ohm: number;
+    w_mm?: number | null;
+    h_mm?: number | null;
+    er?: number | null;
+    t_mm?: number | null;
+  } | null;
+  radiator?: {
+    length_mm_suggest?: number | null;
+    f0_mhz?: number | null;
+    note?: string;
+  } | null;
+  zone?: {
+    net: string;
+    layer: string;
+    bbox_mm?: number[] | null;
+    area_mm2?: number | null;
+  } | null;
+  keepout_checklist: string[];
+  detail: string;
+}
+
+export interface AntennaReport {
+  verify: AntennaVerifyRow[];
+  design: AntennaDesignRecipe | null;
+  marker_help: string;
+}
+
 export interface NetlistPreviewDesignator {
   ref: string;
   pins: { number: string; net_name: string }[];