r = 1;
Pdbm = 43;
PmW = 10^(Pdbm/10) / 1000  //transforma dbm a watts
I = PmW / 4*(PI) * r^2 // calcula la intensidad a la distancia deseada
Pdbm = 10Log( i / 10^-12) //transforma de Watts a dbm

float CalcI(int Pdbm, float d){
float PmW = Mathf.Pow(10,( Pdbm / 10)) / 1000;
float I = PmW / 4 * Mathf.PI * Mathf.Pow(d, 2);
float Pdbm_ = Mathf.Log(10*(PmW/Mathf.Pow(10,-12)));
}

Pdbm = 43
d = 1

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using LitJson;
using System.IO;
public class SaveObjDropedPos : MonoBehaviour {
    private JsonData data;
    private JsonData itemdata;
    private string jsonstring;
    public string info;
    public List<ItemStats> ID = new List<ItemStats>();
    public ItemsManager items;
    private void Start()
    {
        Load();
    }
    public void Save(ItemStats item_)
    {
        ID.Add(item_);
        data = JsonMapper.ToJson(ID);
        info = data.ToString();
        File.WriteAllText(Application.dataPath + "/Json/ItemsPos.json", data.ToString());
    }
    public void Load()
    {
        jsonstring = File.ReadAllText(Application.dataPath + "/Json/ItemsPos.json");
        if (jsonstring != "")
        {
            itemdata = JsonMapper.ToObject(jsonstring);
            for (int i = 0; i < itemdata.Count; i++)
            {
                foreach (InventoryItem item in items.itemsAdd)
                {
                    if (item.ID == itemdata["ID"].ToString())
                    {
                        Transform this_ = Instantiate(item).transform;
                        this_.SetParent(GameObject.Find("ItemBox").transform);
                        this_.transform.position = new Vector3((float)itemdata["X"], (float)itemdata["Y"], (float)itemdata["Z"]);
                    }
                }
            }
        }
    }
}

JsonException: Max allowed object depth reached while trying to export from type System.Single
LitJson.JsonMapper.WriteValue (System.Object obj, LitJson.JsonWriter writer, Boolean writer_is_private, Int32 depth)
writer_is_private, Int32 depth)
LitJson.JsonMapper.ToJson (System.Object obj)
SaveObjDropedPos.Save (.ItemStats item_) (at Assets/Scripts/Saves/SaveObjDropedPos.cs:23)
InventoryItem.SaveMe_ () (at Assets/Scripts/Player/Inventori/InventoryItem.cs:170)
GuardarPartida.Guardar () (at Assets/Scripts/Saves/GuardarPartida.cs:15)
UnityEngine.Events.InvokableCall.Invoke (System.Object[] args) (at C:/buildslave/unity/build/Runtime/Export/UnityEvent.cs:154)
UnityEngine.Events.InvokableCallList.Invoke (System.Object[] parameters) (at C:/buildslave/unity/build/Runtime/Export/UnityEvent.cs:637)
UnityEngine.Events.UnityEventBase.Invoke (System.Object[] parameters) (at C:/buildslave/unity/build/Runtime/Export/UnityEvent.cs:773)
UnityEngine.Events.UnityEvent.Invoke () (at C:/buildslave/unity/build/Runtime/Export/UnityEvent_0.cs:52)
UnityEngine.UI.Button.Press () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:35)
UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:44)
UnityEngine.EventSystems.ExecuteEvents.Execute (IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:50)
UnityEngine.EventSystems.ExecuteEvents.Execute[IPointerClickHandler] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.EventFunction`1 functor) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:261)
UnityEngine.EventSystems.EventSystem:Update()

using System.Collections;
using UnityEngine;
using LitJson;
using System.IO;
public class SaveObjDropedPos : MonoBehaviour {
    JsonData item;
    ItemStats item_ = new ItemStats("azerty", 12, 13, 14);
    public void Start()
    {
        item = JsonUtility.ToJson(item_);
        File.WriteAllText(Application.dataPath + "/Json/ItemsPos.json",item.ToString());
    }
}