{"isbn_13": ["9780471390565"], "last_modified": {"type": "/type/datetime", "value": "2008-04-29 13:35:46.87638"}, "languages": [{"key": "/l/eng"}], "publishers": ["Wiley-Interscience"], "number_of_pages": 1784, "first_sentence": {"type": "/type/text", "value": "Transmission lines in microwave and millimeter wave circuits are normally used to carry information or energy from one point to the other and as circuit elements for passive circuits such as filters, impedance transformers, couplers, delay lines, and baluns."}, "isbn_10": ["0471390569"], "publish_date": "October 13, 2003", "key": "/b/OL7616370M", "authors": [{"key": "/a/OL452014A"}], "title": "Handbook of RF/Microwave Components and Engineering", "type": {"key": "/type/edition"}, "id": 10367255, "revision": 1}