From 8f61cd85d05b387bcfd7c6c8b5bab2304078de25 Mon Sep 17 00:00:00 2001
From: Brendan Haines <brendan.haines@gmail.com>
Date: Fri, 17 Jan 2025 00:34:29 -0700
Subject: [PATCH] fix vswr plots for S11 > 0dB

---
 charon_vna/util.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/charon_vna/util.py b/charon_vna/util.py
index 249131a..a3fe0d2 100644
--- a/charon_vna/util.py
+++ b/charon_vna/util.py
@@ -47,7 +47,7 @@ def db20(v: npt.ArrayLike) -> npt.ArrayLike:
 
 
 def s2vswr(s: npt.ArrayLike) -> npt.ArrayLike:
-    return (1 + np.abs(s)) / (1 - np.abs(s))
+    return np.abs((1 + np.abs(s)) / (1 - np.abs(s)))
 
 
 def minmax(x):