Abstract: An antenna apparatus includes a dielectric base, and a plurality of feeding-radiating elements having different resonance frequencies, each including a feeding electrode and a radiating electrode which are disposed on surfaces of the base. A stub with a common feeding point is disposed on a mounting substrate which supports the base. The feeding electrodes of the feeding-radiating elements are connected to matching points of the stub, thereby achieving impedance matching for each of the feeding-radiating elements.

Abstract: An antenna-electrode structure includes a feeding radiant-electrode and a grounded portion arranged such that an open-end of the feeding radiant-electrode defines a capacitance to the grounded portion therebetween, and a non-feeding radiant-electrode arranged to electromagnetically couple the feeding radiant-electrode. The non-feeding radiant electrode is arranged such that an open-end thereof defines a capacitance to the grounded portion therebetween to produce a dual-frequency resonance state together with the feeding radiant-electrode. In response to a signal supplied from a signal-supply source, the feeding radiant-electrode performs an antenna action and the non-feeding radiant-electrode in turn performs an antenna action by signal transmission from the feeding radiant-electrode, such that by being excited from these actions, the grounded portion also performs an antenna action.

Abstract: In a feeding radiation electrode of a surface mount antenna, a series inductance component such as a meander pattern is formed locally in a maximum resonance current part in a high-order mode (second-order mode) so as to locally form a series inductance component therein thereby making the maximum resonance current part have a greater electrical length per unit physical length than the other parts. This makes it possible to control the difference between the resonance frequency in a fundamental mode and the resonance frequency in the high-order mode over a large range. Furthermore, it is possible to vary the resonance frequency in the second-order mode independently of the resonance frequency in the fundamental mode by varying the number of lines or the line-to-line distance of the meander pattern thereby varying the value of the series inductance component.

Abstract: A circularly polarized wave antenna device that has improved the orthogonality of two radiation electric fields in a degeneration-separated mode. A radiation conductor is formed on one main surface of a substrate, and a ground conductor is formed on the other main surface of the substrate opposite to the radiation conductor. A feeding conductor is formed on the side surface of the substrate so as to extend from the other main surface toward the one main surface. The radiation conductor is formed into a square shape or an electrically square shape in a plan view. On the substrate, capacitive loading conductors are provided in the extended directions of the two diagonal lines of the radiation conductor, the capacitive loading conductors being formed between the ground conductor and the radiation conductor, and having mutually different shapes between the one diagonal direction and the other diagonal direction.

Abstract: A multi-band surface-mounted antenna is formed by disposing a feeding element and a non-feeding element with a distance therebetween on a dielectric base member. The feeding element is formed by extending a feeding radiation electrode from a feeding terminal. The non-feeding element is a branched element formed by branching and extending a first radiation electrode and a second radiation electrode of the non-feeding side from a ground terminal side. The single surface-mounted antenna includes the three radiation electrodes. Thus, the antenna can be easily adapted to multi-bands. In addition, the resonance waves of the three radiation electrodes can be controlled mutually independently. As a result, only a frequency band selected from a plurality of required frequency bands is brought into a multi-resonance state so that the frequency band can be broadened.

Abstract: A circularly polarized antenna device in which a recess is formed in the bottom surface of a dielectric base, and in which a feeder circuit is formed on an area of the top surface of a feeder circuit board covered by the recess. A shield for the feeder circuit is provided inside the recess. A feeder electrode is formed on an outer peripheral side surface of the dielectric base so as to be separated from a radiation electrode. A feeder wiring pattern which connects the feeder circuit and the feeder electrode so that they are in electrical conduction is formed on the top surface of the feeder circuit board. Electrical power supplied to the feeder electrode from the feeder circuit through the feeder wiring pattern is transmitted to the radiation electrode by capacitive coupling. Since the feeder circuit and the shield are accommodated inside the recess of the dielectric base, it is possible to restrict the bulkiness of the circularly polarized antenna device, and, thus, to make it thin.

Abstract: A radiation electrode is formed on the upper face of the substantially columnar dielectric substrate. Feed electrodes for a fundamental mode and for a higher mode are formed on the side peripheral face of the dielectric substrate. Power is supplied through the respective feed electrodes to the radiation electrode via capacitive coupling. The radiation electrode has both of the functions in the fundamental and higher modes. Thus, the circular polarized wave antenna can be reduced in size. Furthermore, since a capacitive feeding system is employed as described above, the respective resonance frequencies in the fundamental and higher modes can be easily adjusted and set at predetermined frequencies. Also, the circularly polarized wave characteristics in the fundamental and higher modes can be easily enhanced, respectively.

Abstract: A patch type radiation electrode is formed in the central area of the upper face of a dielectric substrate. First and second microstrip type radiation electrodes are formed on respective right and left sides of the patch type radiation electrode so as to sandwich the patch type radiation electrode. The first and second microstrip type radiation electrodes are symmetrical with respect to the patch type radiation electrode. If a microstrip type radiation electrode is formed on either one of the right and left sides of the patch type radiation electrode, the directivity of radio waves of the patch type radiation electrode become unsymmetrical, due to effects of the microstrip type radiation electrode. On the other hand, the directivity of radio waves of the patch type radiation electrode can be made symmetrical by forming the microstrip type radiation electrodes on both of the right and left sides of the patch type radiation electrode.

Abstract: A circularly polarized wave antenna which allows the matching of resonant frequencies in a higher order mode to be easily achieved. In this circularly polarized wave antenna, a flat portion is provided by flattening a portion of the peripheral side surface of a substrate. Two feeding electrodes for use in the higher order mode excitation are formed on this flat plane. On one main surface of the substrate, a circular radiation electrode is formed, while, on the other main surface of the substrate, a ground electrode is formed.

Abstract: A circularly polarized wave antenna device that has improved the orthogonality of two radiation electric fields in a degeneration-separated mode. A radiation conductor is formed on one main surface of a substrate, and a ground conductor is formed on the other main surface of the substrate opposite to the radiation conductor. A feeding conductor is formed on the side surface of the substrate so as to extend from the other main surface toward the one main surface. The radiation conductor is formed into a square shape or an electrically square shape in a plan view. On the substrate, capacitive loading conductors are provided in the extended directions of the two diagonal lines of the radiation conductor, the capacitive loading conductors being formed between the ground conductor and the radiation conductor, and having mutually different shapes between the one diagonal direction and the other diagonal direction.

Abstract: A multi-band surface-mounted antenna is formed by disposing a feeding element and a non-feeding element with a distance therebetween on a dielectric base member. The feeding element is formed by extending a feeding radiation electrode from a feeding terminal. The non-feeding element is a branched element formed by branching and extending a first radiation electrode and a second radiation electrode of the non-feeding side from a ground terminal side. The single surface-mounted antenna includes the three radiation electrodes. Thus, the antenna can be easily adapted to multi-bands. In addition, the resonance waves of the three radiation electrodes can be controlled mutually independently. As a result, only a frequency band selected from a plurality of required frequency bands is brought into a multi-resonance state so that the frequency band can be broadened.

Abstract: A circularly polarized antenna device in which a recess is formed in the bottom surface of a dielectric base, and in which a feeder circuit is formed on an area of the top surface of a feeder circuit board covered by the recess. A shield for the feeder circuit is provided inside the recess. A feeder electrode is formed on an outer peripheral side surface of the dielectric base so as to be separated from a radiation electrode. A feeder wiring pattern which connects the feeder circuit and the feeder electrode so that they are in electrical conduction is formed on the top surface of the feeder circuit board. Electrical power supplied to the feeder electrode from the feeder circuit through the feeder wiring pattern is transmitted to the radiation electrode by capacitive coupling. Since the feeder circuit and the shield are accommodated inside the recess of the dielectric base, it is possible to restrict the bulkiness of the circularly polarized antenna device, and, thus, to make it thin.

Abstract: In a feeding radiation electrode of a surface mount antenna, a series inductance component such as a meander pattern is formed locally in a maximum resonance current part in a high-order mode (second-order mode) so as to locally form a series inductance component therein thereby making the maximum resonance current part have a greater electrical length per unit physical length than the other parts. This makes it possible to control the difference between the resonance frequency in a fundamental mode and the resonance frequency in the high-order mode over a large range. Furthermore, it is possible to vary the resonance frequency in the second-order mode independently of the resonance frequency in the fundamental mode by varying the number of lines or the line-to-line distance of the meander pattern thereby varying the value of the series inductance component.

Abstract: A radiation electrode is formed on the upper face of the substantially columnar dielectric substrate. Feed electrodes for a fundamental mode and for a higher mode are formed on the side peripheral face of the dielectric substrate. Power is supplied through the respective feed electrodes to the radiation electrode via capacitive coupling. The radiation electrode has both of the functions in the fundamental and higher modes. Thus, the circular polarized wave antenna can be reduced in size. Furthermore, since a capacitive feeding system is employed as described above, the respective resonance frequencies in the fundamental and higher modes can be easily adjusted and set at predetermined frequencies. Also, the circularly polarized wave characteristics in the fundamental and higher modes can be easily enhanced, respectively.

Abstract: A first radiating electrode 5 and radiating electrode 6 are formed on an upper face 2c of a dielectric base 2 of a surface-mounted antenna 1, and a rectifying circuit 7 is formed on a side face 2b where radiating electrodes 5 and 6 are not formed. This facilitates configuration of a desired rectifying circuit 7 appropriate for the surface-mounted antenna 1, and rectification of the surface-mounted antenna 1 is facilitated. Also, since the rectifying circuit 7 is formed on the side face 2b of the dielectric base 2, effects of the rectifying circuit 7 on the first radiating electrode 5 and second radiating electrode 6 on the upper face 2c can be reduced. Accordingly, high gain and increased bandwidth of the surface-mounted antenna can be obtained.

Abstract: A surface-mount antenna includes a dielectric substrate having a rectangular parallelepiped shape and a radiation electrode having a meandering pattern disposed on the surface of the dielectric substrate. The radiation electrode includes at least two meandering electrode units formed with different meander pitches, the at least two meandering electrode units being connected in series, and the radiation electrode being formed over at least two faces among a front face, a major surface, and a end surface of the dielectric substrate. With the above-described construction, the radiation electrode is allowed to transmit and receive electromagnetic waves in at least two different frequency bands.

Abstract: A surface-mounted type antenna which facilitates the realization of the widening of the frequency band, and a communication device including it. In this antenna, the strong electric-field regions of a power supplied first radiation electrode and a power non-supplied second radiation electrode are disposed adjacent to each other with a spacing therebetween, and simultaneously the high current regions of these radiation electrodes are disposed adjacent to each other with a spacing therebetween. By variably adjusting the quantity of the electric-field coupling between the strong electric-field regions of the first radiation electrode and the second radiation electrode, and by variably adjusting the quantity of the magnetic-field coupling between the high current regions of these radiation electrodes, both the quantities of the electric-field coupling and the magnetic-field coupling are set to conditions suited for the dual resonance. A superior dual resonance is thereby achieved.

Abstract: In an antenna unit, the generation of capacitances between each of the open ends of first and second microstrip antennas and a control electrode is controlled by turning a switch on and off, both antenna frequencies being simultaneously changed.

Abstract: A compact surface-mounted antenna having a wide frequency band. In the surface-mounted antenna, a first radiation electrode is formed on the left-half region of the upper surface of a base dielectric substrate. A multi-layer dielectric substrate is laminated on the upper surface of the base dielectric substrate to be bonded and fixed thereto. A second radiation electrode is formed on the right-half region of the upper surface of the multi-layer dielectric substrate. The first and second radiation electrodes are not vertically opposed to each other. Opposing edges of the first and second radiation electrodes are oblique lines. A feeding signal of a signal source is supplied to the first radiation electrode by coupling from a feeding connection electrode, and then, is supplied to the second radiation electrode from the first radiation electrode by another coupling between the first and second radiation electrodes.

Abstract: An antenna device comprising: a feeding radiation electrode and a non-feeding radiation electrode separately disposed on a surface of a dielectric substrate; a short circuit part of the feeding radiation electrode and a short circuit part of the non-feeding radiation electrode adjacently disposed to each other on one side surface of the dielectric substrate; and an open end of the feeding radiation electrode and an open end of the non-feeding radiation electrode disposed on mutually different surface sides of the dielectric substrate other than the surface on which said short circuit parts are disposed.