A new antenna structure for a mobile phone mainly comprises an antenna stem, a swivel joint, a high-frequency connector, and an impedance-matching member; the swivel joint includes an antenna-mounting base, a joint-fastening base and an outer protection sleeve; the swivel joint has a very small height...http://www.google.fr/patents/US5214434?utm_source=gb-gplus-shareBrevet US5214434 - Mobile phone antenna with improved impedance-matching circuit
Mobile phone antenna with improved impedance-matching circuit
