Hyunseong Kang

Electrically Small Dual-Band Reconfigurable Complementary Split-Ring Resonator (CSRR)-Loaded Eighth-Mode Substrate Integrated Waveguide (EMSIW) Antenna

In this paper, we propose a novel electrically small dual-band reconfigurable antenna. By using a compact eighth-mode substrate integrated waveguide (EMSIW) structure, we designed a compact antenna. This antenna is capable of dual-band operation by additionally loading an electrically small complementary split-ring resonator (CSRR) structure. The EMSIW and CSRR structures are designed for satisfactory operations at bandwidths of 1.575 GHz [global positioning system (GPS)] and 2.4 GHz [wireless local area network (WLAN)], respectively. We load the CSRR with a varactor diode to achieve a narrow bandwidth and to enable the resonant frequency to continuously vary from 2.4 GHz to 2.5 GHz. Thus, we realize a channel selection function, which is used according to WLAN standards. Irrespective of the variation in the varactor diode voltage, the resonant frequency of the EMSIW is not varied, such that the antenna maintains a constant frequency at the GPS bandwidth even at different voltages. Consequently, as the DC bias voltage varies from 11.4 V to 30 V, the resonant frequency at the WLAN bandwidth continuously varies between 2.38 GHz and 2.5 GHz. We observe that the simulated and measured s-parameter values and radiation patterns are in good agreement with each other.

Frequency Reconfigurable and Miniaturized Substrate Integrated Waveguide Interdigital Capacitor (SIW-IDC) Antenna

A novel frequency reconfigurable substrate integrated waveguide-interdigital capacitor (SIW-IDC) antenna is presented. The antenna is designed based on a composite right/left-handed (CRLH) resonator, which is realized by the SIW-IDC. Thanks to CRLH characteristics, the antenna size is reduced. Since the IDC determines the resonant frequency, a varactor diode is embedded on the interdigital slot of the short-ended SIW. Its zeroth-order resonance (ZOR) frequency is varied from 4.13 GHz to 4.50 GHz by changing the bias voltage from 0 V to 36 V while keeping good impedance matching better than 15 dB. The radiation performance is numerically and experimentally investigated. Very good agreements between the simulated and measured S-parameters and radiation patterns are observed.

Electrically small dual-band substrate-integrated-waveguide antenna with fixed low-frequency and tunable high-frequency bands

In this paper, we propose a novel electrically small dualband reconfigurable antenna. Lowand high-frequency resonances are generated by a substrate-integrated-waveguide (SIW) cavity resonator and a complementary split-ring resonator (CSRR). The overall size is reduced because of the use of an eighth-mode SIW (EMSIW) and an evanescent-mode CSRR. The varactor-loaded CSRR enables only the high frequencies to continuously vary from 2.38GHz to 2.5GHz for channel selection of wireless local area network (WLAN), while the low frequencies are fixed at 1.575GHz for global position system (GPS), because the two resonant frequencies can be independently controlled. The proposed concept is demonstrated by the simulated and measured s-parameters and radiation patterns.

Electric and Magnetic Mode-Switchable Dual Antenna for Null Compensation

A novel dual antenna is proposed for null compensation. The primary antenna is a rectangular loop antenna that generates an electric-loop mode. A zeroth-order resonant (ZOR) antenna is used as the auxiliary antenna, which produces a magnetic-loop mode and reduces the overall antenna size. Since the auxiliary antenna can be placed inside the primary antenna, the overall occupied space is the same as the size of the single primary loop antenna. The electric- and magnetic-loop current distributions are orthogonal to each other, so their nulls are effectively compensated. The performances of the proposed antennas are demonstrated in both a full-wave simulation and experiments at 2.3 GHz.

Dual-Band Frequency Reconfigurable Small Eighth-Mode Substrate-Integrated Waveguide Antenna

In this paper, we propose a new frequency reconfigurable dual-band antenna. By using an electronically compact eighth-mode substrate-integrated-waveguide(EMSIW) resonator, we have designed a compact antenna, which performs dual-band movement by additionally loading a complementary split ring resonator(CSRR) structure. The EMSIW and CSRR structures are designed to satisfy the bandwidths of 1.575 GHz(GPS) and 2.4 GHz(WLAN), respectively. We load the CSRR with a varactor diode to allow a narrow bandwidth and to enable the resonance frequency to continuously vary from 2.4 GHz to 2.5 GHz. Thus, we realize a channel selection function that is used in the WLAN standards. Irrespective of how a varactor diode moves, the EMSIW independently resonates so that the antenna maintains a fixed frequency of the GPS bandwidth even at different voltages. Consequently, as the DC bias voltage changes from 11.4 V to 30 V, the resonance frequency of the WLAN bandwidth continuously changes between 2.38 GHz and 2.5 GHz, when the DC bias voltage changes from 11.4 V to 30 V. We observe that the simulated and the measured S-parameter values and radiation patterns are in good agreement with each other.

Electrically-small eighth-mode SIW antenna with fixed frequency and independently tunable frequency

An electrically-small eighth-mode substrate integrated waveguide (EMSIW) antenna is presented for a dual-band operation. A low frequency of 1.575 GHz is constant for global positioning system (GPS) reception, while a high frequency of 2.4 GHz is electronically tuned for WLAN applications. The overall antenna size is miniaturized by introducing the EMSIW and the complementary split ring resonator (CSRR). The proposed antennas performances are numerically and experimentally demonstrated from S-parameters and radiation patterns.

Electrically Small Eighth-Mode Substrate-Integrated Waveguide(EMSIW) Antenna Loading Complementary Split Ring Resonator(CSRR)

Based on a substrate integrated waveguide(SIW) and a complementary split ring resonator(CSRR), electrically small antennas are proposed in this paper. Antenna`s electrical size is reduced by introducing both CSRR and the eighth-mode substrate integrated waveguide(EMSIW). The EMSIW occupies only 12.5 % of the conventional SIW at the same dominant resonant frequency. In addition, the resonant frequency of the antenna is varied by rotating the CSRR on the EMSIW while keeping the same radiation patterns. The resonant frequency is changed from 4.74 GHz to 5.07 GHz by varying orientation of the CSRR from 0 to 360 degree. Unidirectional radiation patterns are observed and the measured peak gains are from 4.50 to 5.92 dBi.