Abstract: An antenna adapted for satellite communication. A plurality of planer radiating elements are disposed under a ground conductor of a microstrip planar antenna, and the ground conductor is coupled with the respective radiating elements through electrically coupling means. Further, a plurality of linear radiating elements are coupled with the ground conductor and electrically connected to a sperrtopf applied to a coaxial line which acts as a feeder line. As an antenna used for satellite communication, it is possible to improve the gain at a low elevation angle in a wide angle circular polarization antenna.

Abstract: An antenna adapted for satellite communication. A plurality of planer radiating elements are disposed under a ground conductor of a microstrip planar antenna, and the ground conductor is coupled with the respective radiating elements through electrically coupling means. Further, a plurality of linear radiating elements are coupled with the ground conductor and electrically connected to a sperrtopf applied to a coaxial line which act as a feeder line. As an antenna used for satellite communication, it is possible to improve the gain at a low elevation angle in a wide angle circular polarization antenna.

Abstract: The present invention seeks to provide a dual mode mobile satellite communication unit, which requires low communication cost and very little battery power, does not require always carrying a large unit frame and does not always provide great weight burden on the user. A terrestrial communication portable unit is detachably mounted in the mobile satellite communication unit. The mobile satellite communication unit as base unit does not include a key operating section, a display section and a speech transducer section having a microphone and a loudspeaker, and utilizes those mechanically assembled on the portable unit side for keying and other operations. In an interlocked relation to the removal of the portable unit, the stand-by state of the base unit is turned off. It is thus possible to avoid wasteful battery power consumption on the base unit side.

Abstract: A microstrip plane antenna and a helical antenna are arranged substantially in line therewith. A base conductor of the microstrip plane antenna is electrically coupled with the helical antenna, thereby allowing stable communications with a orbiting communications satellite in the sky.

Abstract: It is an object of the present invention to provide a portable terminal which reduces an antenna standing-wave ratio and absorbs reflected waves without inserting an isolator so that a stable operation can be obtained efficiently with a compact, low-price body.