Now I have created my own very simple autocomplete function. If it should someone need, here is the code with the basics.

View:

<div ng-controller="byte5.addressPickerController">
<div id="addressSearchContainer" ng-show="addressSearchContainerVisible==true">
<input type="text" class="searchField innerBox" ng-model="searchTerm" /><a href="" class="btn btn-success"> Your button text </a>
<div class="autocomplete innerBox" ng-show="autocompleteHide==false">
<ul>
<li ng-repeat="autoText in autocompleteSource | filter:searchTerm" ng-click="selectAutoText(autoText)">{{autoText}}</li>
</ul>
</div>
</div>
</div>

Controller:

angular.module("umbraco").controller("byte5.addressPickerController", function ($scope) {
$scope.autocompleteSource = [ "Berlin","Frankfurt","Halle","Hamburg","Hannover","München","Stuttgart","Köln","Saarbrücken","Dresden"];

 $scope.autocompleteHide = true;

$scope.selectAutoText = function(text) {
        $scope.searchTerm = text;
        $scope.searchTermSelected = true;
        $scope.autocompleteHide = true;
}

    $scope.$watch('searchTerm', function (newVal, oldVal) {
        if ($scope.searchTermSelected == false) {
            if (newVal != undefined) {
                if (newVal.length > 2) {
                    $scope.autocompleteHide = false;
                } else {
                    $scope.autocompleteHide = true;
                }
            }
        } else {
            $scope.searchTermSelected = false;
        }
});
});

CSS:

#addressSearchContainer {
    margin: 10px 0px;
    border: 1px solid #ccc;
}

.innerBox {
    margin-left: 10px;
    margin-right: 10px;
}

.searchField {
    width: 58%;
    margin-right: 10px;
}

.autocomplete ul {
    margin-left: 0px;
    border: 1px solid #ccc;
    width: 58%;
}

.autocomplete ul li{
    list-style: none;
    padding: 5px 6px 5px 6px;
}

.autocomplete ul li:hover {
    background-color: #f8f8f8;
}

It is certainly not the best way to solve this, but it is a possible solution

I hope it helps everyone needs something like this.

Best, 
Sören