Portable wireless terminal
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsHideaki Shoji, Yasuhito Imanishi, Toru Fukasawa, Hiroyuki Ohmine
Life of this patent
Estimating the term…
Abstract
A portable telephone includes a metal substrate, a shield box, a monopole antenna and a feed unit. The surface of the metal substrate includes a conductive metal layer. The shield box covers a radio transmitter-receiver unit provided on the metal substrate to electromagnetically shield the radio transmitter-receiver unit, and has conductivity. The monopole antenna extends in a predetermined direction, and has an electrical length of (λ/2)×N (N is an integer). The feed unit is provided at the metal substrate so as to be apart from the shield box in the extending direction of the monopole antenna. The feed unit includes a matching circuit.
Claims5
A portable radio terminal comprising:
- a substrate including a portion with a conductive surface;
- a conductive shield member covering a radio transmitter-receiver provided on said substrate, electromagnetically shielding said radio transmitter-receiver;
- an antenna element extending in a predetermined direction, having an electrical length of (λ/2)×N (N is an integer);
- and
- a feed unit provided at said substrate so as to be separated from and above an uppermost edge of said shield member in an extending direction of said antenna element, including a matching circuit connected to said antenna element.
A portable radio terminal comprising:
- a substrate having a conductive surface;
- a conductive shield member covering a radio transmitter-receiver unit provided on said substrate, electromagnetically shielding said radio transmitter-receiver;
- a dielectric provided on said substrate;
- a feed unit provided on said dielectric so as to be apart from the surface of said substrate in a thickness direction of said substrate, and including a matching circuit;
- and
- an antenna element connected to said feed unit, and having an electrical length of (λ/2)×N (N is an integer),
- wherein an outer circumference of the dielectric completely surrounds an outer circumference of the matching circuit.
Dependencies are inferred from the claim text.