Kyushu TEN Ltd

Sasebo, Japan

Kyushu TEN Ltd

Sasebo, Japan
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Ijiguchi T.,Kyushu University | Kanemoto D.,Yamanashi University | Yoshitomi K.,Kyushu University | Yoshida K.,Kyushu University | And 5 more authors.
IEEE Antennas and Wireless Propagation Letters | Year: 2014

This letter presents a new design for a circularly polarized one-sided directional slot antenna with reflector metal for 5.8-GHz dedicated short-range communications (DSRC) operations. Our proposed antenna was composed of a slot antenna, additional slots, a floating metal layer, and reflector metal. By optimizing the lengths and widths of the slots in the two orthogonal directions, circularly polarized radiation was generated. In order to improve the antenna gain, some slots were attached on the top metal layer, and a floating metal layer was attached to the bottom of the antenna. Moreover, an additional dielectric substrate and reflector metal layer were connected to the back of the antenna. The total antenna size including the reflector metal layer was 22.6 × 22.6 × 6.926mm3. Our proposed antenna was fabricated on an FR4 substrate. The measured impedance bandwidth was 760 MHz from 5.82 to 6.58 GHz, and the measured circularly polarized gain was 4.59 dBic. © 2014 IEEE.


Ijiguchi T.,Kyushu University | Kanemoto D.,Yamanashi University | Yoshitomi K.,Kyushu University | Yoshida K.,Kyushu Ten Ltd. | And 5 more authors.
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2013

A novel design method of circularly polarized planar slot antenna for 5.8 GHz Dedicated Short Range Communications (DSRC) applications is proposed. For realized circularly polarized wave, we use planar slot antenna. By optimizing the lengths and widths of antenna slot, resonances can be obtained at 5.8 GHz frequency. The antenna generates a circularly polarized wave providing a slot in the two orthogonal directions. Improving the gain by providing a slot in the same direction, arrayed structure is adopted. The final antenna size is 17 mm × 15 mm × 1.6 mm. Our antenna was fabricated on the FR4 substrate and impedance bandwidth is 310 MHz from 5.62 to 5.93 GHz. Moreover circularly polarized wave can be obtained. © 2013 IEEE.


Yang L.,Nanjing University of Information Science and Technology | Tammam E.,Alexandria University | Yoshitomi K.,Kyushu University | Ijiguchi S.,Kyushu University | And 6 more authors.
IEICE Electronics Express | Year: 2012

A novel coplanar waveguide (CPW) fed slot antenna for ultra-wideband (UWB) short range impulse radar systems is presented. A floating metal layer on the bottom of the antenna's substrate is used to realize the one-sided directional radiation and high gain. The antenna's dimensions are optimized to achieve impedance bandwidth of 7.8-9.2 GHz. The final size of the antenna is 29mm × 16mm × 1.6 mm. The proposed antenna is simulated, fabricated, and measured while a good agreement between the simulation and measurement results is obtained. © IEICE 2012.


Kanaya H.,Kyushu University | Kanemoto D.,Kyushu University | Hayakawa K.,Kyushu University | Yoshida K.,Kyushu University | And 6 more authors.
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2013

This paper presents the design and implementation of miniaturized slot antenna with two-stage impedance matching circuit for 800MHz and 2GHz up/down link multiband application. Our proposed multi-band antenna is designed and simulated by using commercial three-dimensional electromagnetic (EM) field simulator. Also, we fabricated this multi-band antenna on FR4 substrate and measured the frequency characteristics. © 2013 IEEE.


Kanaya H.,Kyushu University | Hayakawa K.,Kyushu University | Nagata Y.,Kyushu University | Kanemoto D.,Kyushu University | And 6 more authors.
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2011

This paper presented the development of a miniaturized slot antenna, and its length is smaller than quarter wavelength, with a coplanar transmission line-based matching circuit on a printed circuit board. The matching circuit is realized by applying 2-stage band-pass filter (BPF). Moreover, we realized a dual band frequency characteristic in order to separate the uplink and downlink, which is suitable for a frequency division duplex (FDD) application. Our proposed dual band antenna is designed and simulated by using commercial three-dimensional electro magnetic (EM) field simulator. Also, we fabricated this dual band antenna on FR4 substrate and measured the frequency characteristics. © 2011 IEEE.


Ijiguchi S.,Kyushu University | Kanaya H.,Kyushu University | Kanemoto D.,Kyushu University | Yoshida K.,Kyushu University | And 5 more authors.
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2011

A novel design method of one-sided directional printed slot antenna for high-band ultra wide band (UWB) systems is proposed. For realize the one-sided directional radiation, we applied the floating metal layer on the bottom of the antenna substrate. By optimizing the lengths and widths of the antenna slot and substrate, three resonances can be obtained at different frequencies. By independently controlling three different resonances on the slot and antenna substrate, we can realize the wide band impedance matching. The final antenna size is 29 mm 16 mm 1.6mm. Our proposed antenna was fabricated on the FR4 substrate and measured impedance bandwidth is 2.58 GHz from 7.74 to 10.32 GHz. Moreover one-sided directional radiation can be obtained. © 2011 IEEE.

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