Abstract: A microstrip antenna includes a rectangular dielectric substrate, a ground plate conductor formed on one surface of the dielectric substrate, a rectangular radiating conductor formed on the other surface of the dielectric substrate, a crossed slot formed in the radiating conductor and provided with two arms extended along orthogonal sides of the radiating conductor, the two arms having lengths different from each other, and at least one power-supply point formed on a diagonal line of the radiating conductor or an extension line of the diagonal line but different from a center of the radiating conductor. The length of at least one of the arms is equal to or more than a value obtained by subtracting a four times value of a thickness of the dielectric substrate from a length of a side of the radiating conductor along the arm.

Abstract: The invention has for its object to achieve a high-performance lens antenna which can be integrated with the external (surface) shape of a mobile unit with no damage to the appearance of the mobile unit and is easy to manufacture and assemble at relatively low costs. To accomplish this, the invention provides a lens antenna mounted on a mobile unit, in which the radiation-side surface thereof and the focal-side surface thereof are each of a quasi-optical shape as a lens, and which is in a non-body of rotation form.

Abstract: A microstrip antenna includes a rectangular dielectric substrate, a ground plate conductor formed on one surface of the dielectric substrate, a rectangular radiating conductor formed on the other surface of the dielectric substrate, a crossed slot formed in the radiating conductor and provided with two arms extended along orthogonal sides of the radiating conductor, the two arms having lengths different from each other, and at least one power-supply point formed on a diagonal line of the radiating conductor or an extension line of the diagonal line but different from a center of the radiating conductor. The length of at least one of the arms is equal to or more than a value obtained by subtracting a four times value of a thickness of the dielectric substrate from a length of a side of the radiating conductor along the arm.

Abstract: The invention has for its object to achieve a high-performance lens antenna which can be integrated with the external (surface) shape of a mobile unit with no damage to the appearance of the mobile unit and is easy to manufacture and assemble at relatively low costs. To accomplish this, the invention provides a lens antenna mounted on a mobile unit, in which the radiation-side surface thereof and the focal-side surface thereof are each of a quasi-optical shape as a lens, and which is in a non-body of rotation form.

Abstract: A microstrip antenna includes a ground electrode and a patch electrode supported to face with each other via a dielectric layer. The patch electrode has a reactance-mounted pattern which includes one end section, the other end section and a center section between the end sections. The end sections are located along a current flow direction and have a large width. The center section has a width smaller than that of the end sections. Each of contours of inside corners of the reactance-mounted pattern is formed by a continuous smooth curve.

Abstract: Input-output terminal electrodes 3 and 4 are overlaid in both respective edge faces of the multilayer body 1 of a multilayer filter. Ground electrodes 5 and 5 are overlaid on both respective sides of the multilayer body 1. Through-hole electrodes 16 and 17 for use as a pair of inductance elements are formed in the multilayer body. One ends of the inductance elements are each electrically coupled to the input-output terminal electrodes 3 and 4, the other ends being connected to the conductive layer formed as a sealed electrode 21. Paralleled capacitors connected to the inductance elements are formed in the multilayer body 1. The ratio W/d of the diameter d of the through-hole electrodes 16 and 17 to width W between the ground electrodes 5 and 5 on both edge faces of the multilayer body 1 is set at not less than 1.6 and not greater than 11.4.