Steps to reproduce the issue

I am developing a component.
In this component I would like to add an input tag field (the same you have when you create an article).This input will be associated to a custom search panel. I tried:
$tags= JFormHelper::loadFieldType('Tag');
echo $tags->input;
But it returns an error:
Fatal error: Call to a member function getName() on null in C:\wamp64\www\mynotes\libraries\cms\form\field\tag.php on line 155

Indeed to be able to execute JFormFieldTag::getInput a form object is required. See tag.php -> getOptions():
if ($this->form->getName() == 'com_tags.tag')

Expected result

I am expecting a tag input field as when you create an article.

Actual result

Fatal error: Call to a member function getName() on null in C:\wamp64\www\mynotes\libraries\cms\form\field\tag.php on line 155

System information (as much as possible)

joomla Joomla! 3.6.2 / Windows 7 / WAMP 3.0.6

Additional comments

Maybe it is not a bug but a misuse. If so please let me know the correct procedure.