• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.497-499
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• 2013

In this paper, electrical lengths and impedances of a dual-mode resonator are calculated by using the transfer function of a dual-mode resonator by realizing the short-stub. The electrical length of transmission-line for a resonator is function of the frequency and the electrical length of stub is defined by the frequency and impedances of line and stub. Also, the inverter value of a bandpass filter using the dual-mode resonator is calculated. The effect of stub's impedance for inverter is very small. And, as the impedance of line is decreasing, the inverter value is increasing and as the bandwidth is increasing, the inverter value is increasing.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.12
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• pp.1432-1437
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• 2010

This paper proposes a new design method of bandpass filter with single dual-mode resonator. In the proposed method, a coupling coefficient between two resonators was obtained by considering a dual-mode resonator as two single resonators. Based on the obtained coupling coefficient, two resonant frequencies of dual-mode resonator were calculated and then arranged according to a transmission zero's location of required filter. To verify the proposed theory, two WLAN bandpass filters which have a transmission zero to a lower and an upper stopband repectively were designed and implemented.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.3
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• pp.253-261
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• 2010

In this paper, the design and the fabrication of dual bandpass filter using heterogeneous resonators is presented. Each resonator would not have an effect on each resonant frequency. Two types of resonators are designed to have different fundamental resonant frequencies, one for the lower passband and the other for the upper passband. In the lower band, half and quarter wavelength resonators were used. In the upper band, a dual-mode resonator was used for adjusting bandwidth. In the upper pass band frequency, resonators of lower passband acts as the input and output. For WLAN, Proposed filters with different second passband frequencies at 2.45/5.2 GHz and 2.45/5.8 GHz are designed and fabricated.

• Electronics and Telecommunications Trends
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• v.13 no.5 s.53
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• pp.53-64
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• 1998

본 고에서는 한파장 폐루프 공진기의 기본특성과 이를 활용한 이중모드 필터 구조 및 필터의 주요특징을 기술하였다. 또한 독립적인 직교공진모드를 이용한 폐루프 공진기의 특성과 공진기의 크기를 소형화 하는 기법 및 소형화 된 공진기의 공진조건 등을 기술하였고, 소형화 된 공진기를 이용한 듀플렉서의 응용 예 등에 대해 기술하였다. 폐루프 공진기를 이용한 이중모드필터 등은 마이크로 스트립 형태로 구현이 가능하기 때문에 MIC 또는 MMIC 등에 적합한 구조이며, 능동소자 등의 삽입이 가능하기 때문에 능동필터, VCO, 튜닝필터 등의 구현이 가능하고 소형의 듀플렉서 설계가 가능하기 때문에 향후 마이크로파 부품분야에서 기대되는 부품이라 할 수 있다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.6 no.4
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• pp.267-271
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• 2013

A new structure of double-resonant cylindrical monopole is proposed for multiple band applications. Multiple band property for the proposed antenna is achieved by adjusting the coupling structure of the antenna base for a double resonance. Measured results of the proposed antenna are compared with those of wire and thick cylinder monopoles.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.2
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• pp.368-373
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• 2006

In this paper, a CPW fed rectangular slot antenna loaded with two slots for dual band operation is presented. This antenna operates at about 2.1GHz and 3.3GHz with the broad bandwidth at these frequencies. a CPW inset structure is used to match the antenna at the two seperated frequencies. Some prototypes of the proposed dual frequency antenna have been implemented. Experimental results are presented and discussed.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.10 no.3
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• pp.74-78
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• 2011

In this paper, the bandpass filter for ITS system of 5.8 GHz is proposed by using the dual-mode resonator with the radial stub. As alternating the open stub with the radial stub, the size of the dual mode resonator can be reduced about 39.6% and the out-of-band characteristics of the bandpass filter using dual mode resonator can be enhanced from 19.4 dB to 29.1 dB by using the stub of $6.9{\Omega}$ i.e. realized by parallel two radial stubs with $60^{\circ}$ angle. The fabricated bnadpass filter using the dual mode resonator has the center frequency of 5.72 GHz with the fractional bandwidth of 4.1%. Also, the filter has the insertion loss and return loss of 1.79 dB and 19.4 dB, respectively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.3
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• pp.508-512
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• 2007

In this paper, a novel wideband crossed planar monopole antenna with the double resonance characteristics is proposed. The proposed monopole antenna consists of a wideband crossed planar monopole antenna and L-shaped slits. In order to generate double resonance characteristics on the proposed monopole antenna, the length of L-shaped slit on the antenna surface is obtained from the quarter-wavelength of the second resonance frequency The double resonance characteristics of the proposed antenna can be easily designed by the control of length of L shaped slit at an interesting frequency. The proposed antenna having an omnidirectional radiation pattern and a high gain over the double resonance frequency bands, respectively, is suitable for mobile multiband antenna.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.7
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• pp.633-640
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• 2002

In this paper, the small chip meander antenna for dual-frequency operation is presented. The proposed chip meander antennas was fabricated by the ceramic chip using LTCC-MLC process. It is a novel compact dual-frequency design using a meandered patch that achieves more degrees of freedom for adjusting dual-frequency operation and the size reduction with narrow frequency ratio. And it is proposed that the 3D structure for additional size reduction of the meander antenna. The size reduction of the 3D meander antenna is as large as 50 % as compared to the design for dual-frequency operation not using 3D structure. It is observed that the principle of dual-frequency operation through current distribution, return loss and radiation pattern.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.10 no.7
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• pp.1138-1147
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• 1999

In this paper, two types of $2\times2$ Rx/Tx microstrip patch antenna are proposed to implement Ku-band satellite communications. The single-fed dual resonance patch antenna as the first type derives perpendicular polarizations at two resonant frequencies from a single patch radiator, using aperture coupling via a bended single-feeding line and a cross-shaped slot. The double-fed dual resonance patch antenna as the second type implements dual resonance with mutually orthogonal polarizations by mixing the two feeding mechanisms of the microstrip line and the aperture coupling. Especially, in the double-fed dual resonance antenna case, air-gap is introduced to broaden the bandwidth. Through measurement, each of the two types of antenna was verified to function properly both Rx and Tx. The double-fed dual resonance antenna shows excellent performance in the bandwidth and the crosspolarization characteristics.