Antenna coupling apparatus, external-antenna connecting apparatus, and onboard external-antenna connecting apparatus

An antenna coupling apparatus comprising:

• a first antenna connected to a portable radio terminal;
• a second antenna separated from said first antenna;
• an electromagnetic coupling element consisting of a conductor that electromagnetically couples said first and second second antennas together;
• a ground conductor coupling element arranged adjacent said electromagnetic coupling element and being electromagnetically coupled to said first antenna;
• and
• a ground conductor element arranged proximate said first antenna and being electrically connected to said ground conductor coupling element for reflecting power transmitted from or received by said first antenna toward said electromagnetic coupling element, wherein said electromagnetic coupling element and said ground conductor coupling element each have a plurality of electrical conductors in the form of rings.

An onboard external-antenna connecting apparatus for a portable radio terminal comprising:

• an onboard antenna installed on the portable radio terminal;
• an external antenna connected to said onboard antenna;
• an external power for supplying power to the portable radio terminal;
• a body for securing said portable radio terminal upon installing the portable radio terminal into said body from above;
• an electromagnetic coupling circuit disposed in said body for electromagnetically coupling said onboard antenna of said portable radio terminal and said external antenna, said coupling circuit being out of contact with said portable radio terminal with respect to DC components when the portable radio terminal is secured in said body;
• a connecting member arranged in said body for connecting said external power and the portable radio terminal together to supply power from said external power to the portable radio terminal;
• a mounting member movably connected to said body and operating in conjunction with the installing of the portable radio terminal in said body and including a first connector for feeding power from said external power to the portable radio terminal installed on said mounting member;
• and
• a second connector installed on the portable radio terminal for receiving power from said external power when connected with said first connector.