Browsing by Author "Chung, Shyh-Jong"

Now showing 1 - 20 of 84

A 2-D Amplifying Array Using Multi-Ported Aperture-Coupled Patch Antennas
(2009-07-01)
Ho, Tan-Hsiung
;
Chen, Wei-Jen
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
This paper proposes a new circuit-fed 2-D amplifying array architecture using the multi-ported aperture-coupled patch antennas. The power distribution achieved by this array is formed by stacking three kinds of basic cells repeatedly. Each cell, which serves as a radiator and also a power relay, has a multi-ported patch antenna and one or two amplifiers. The signal transmission coefficient of the cell from the input port to the output port is designed with a power level of 0dB and a phase of 360 degrees. An X-band 4 x 3 element array with uniform amplitude distribution is demonstrated. The measured results, such as the antenna gain and the radiation patterns, agree very well with the predicted ones, due to the precision design of the basic cells. The measured gain of the antenna array is 27.7 dBi(A) at the frequency of 10.4 GHz on the H-plane, with a half-power beamwidth of 14 degrees in the H-plane and 16 degrees in the E-plane.
A 2.45/5.2 GHz Image Rejection Mixer With New Dual-Band Active Notch Filter
(2009-11-01)
Liang, Ching-Piao
;
Rao, Pei-Zong
;
Huang, Tien-Jien
;
Chung, Shyh-Jong
;
電信工程研究所
A 2.45/5.2 GHz dual-band Gilbert downconversion mixer with image rejection function is presented, which is implemented using the 0.18 mu m CMOS technology. The proposed differential dual-band image rejection circuitry is employed for the 2.45/5.2 GHz WLAN application to effectively diminish the dc power consumption and complexity of circuit design compared to the traditional Hartley or Weaver architectures. Moreover, the cross-connected pair consisted of NMOS and PMOS transistors in the proposed notch filter will further ameliorate the image rejection capability. The IC prototype achieves conversion gain of 10.5/11 dB, IIP3 of -4.9/-5.2 dBm for RF = 2.45/5.2 GHz and IF = 500 MHz while the image rejection ratio is better than 36/45 dB in the whole operation bandwidth.
A 24 GHz Low-power and High-gain Low-noise Amplifier Using 0.18 mu m CMOS Technology for FMCW Radar Applications
(2012)
Lin, Chun-Yi
;
Lin, Ming-Wei
;
Liang, Ching-Piao
;
Chung, Shyh-Jong
;
傳播研究所
In this paper, a low power and high gain low-noise amplifier (LNA) is presented for 24 GHz FMCW radar applications fabricated in a 0.18 mu m RF CMOS process. The proposed LNA is with the characteristics of the source inductive degeneration type, the current reuse technique, and the invariance of current density in CMOS process. The proposed LNA with a compact size has a gain of 18.95 dB and a noise figure of 5.8 dB, while consuming 11.3 mW. The measured input 1-dB compression point (IP1 dB) and an input third-order intercept point (IIP3) are -26 dBm and -16.5 dBm, respectively.
A 77-GHz 2T6R Transceiver With Injection-Lock Frequency Sextupler Using 65-nm CMOS for Automotive Radar System Application
(2016-10)
Hsiao, Yuan-Hung
;
Chang, Yu-Chuan
;
Tsai, Ching-Han
;
Huang, Ting-Yi
;
Aloui, Sofiane
In this paper, a CMOS multichannel transceiver (TRX) is proposed for angular identification in automotive car radar applications. Two transmitters (TXs) and six receivers (RXs) are placed on the same die using 65-nm CMOS technology with chip size 3.5x3 mm(2). To generate a millimeter-wave (MMW) frequency-modulated continuous-wave signal, an injection-lock frequency sextupler cascaded a 1-to-8 Wilkinson power dividing network with wideband isolation is designed as the LO-chain to convert external source from 12.5-13.7 to 75-82.2 GHz for both the TXs and RXs. Each TX achieves above 11-dBm output power and the RXs achieve 30-dB conversion gain from 75 to 82 GHz, and the total power dissipation of whole chip is 1.43 W. Compared with other published multichannel TRXs in silicon germanium (SiGe) process, this paper demonstrates compatible performances and the potential of multichannel TRX using CMOS for MMW automotive car radar application.
A Band-Notched UWB Monopole Antenna With High Notch-Band-Edge Selectivity
(2012-10-01)
Chuang, Chao-Tang
;
Lin, Ting-Ju
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
In this paper, a novel band-notched ultrawideband (UWB) monopole antenna with high notch-band-edge selectivity is proposed and demonstrated. The proposed antenna consists of a radiation patch and an embedded second-order bandstop filter. Using the same substrate area as a fundamental UWB antenna, a bandstop filter composed of a nonuniform short-circuited stub and coupled open-/short-circuited stub resonators, is designed into the fundamental antenna. A detail design procedure for the proposed antenna with a second-order maximally flat bandstop filter at 5.5 GHz is presented. As compared to the fundamental antenna, the proposed UWB antenna provides good notch-band suppression from 5.15 to 5.95 GHz, in which the normalized total radiated powers in the notch band are lower than -12 dB. Also, the proposed structure provides high band-edge selectivity and flat return loss in the notch band. The measured results, including the return loss and total radiated power, agree with the designed ones.
A Co-design of Dielectric Lens and Folded Reflectarray Antenna with the Application to 77 GHz Long-Range Mode Forward-Looking Vehicle Collision Warning Radar System
(2012)
Tsai, Ching-Han
;
Kan, Li-Han
;
Chen, Huo-Hui
;
Chung, Shyh-Jong
;
傳播研究所
A novel antenna for the application of the long-range mode forward-looking collision warning radar system was developed and demonstrated in this paper. By the co-design of the folded-reflectarray antenna and the dielectric lens, a long-range mode operation can be realized. When the radar system is operated in the long range mode, the antenna had high directivity characteristic. To cooperate with the algorithm used in long range mode (76 - 77 GHz). The antenna we introduce in this paper has the advantages to integrate the two different modes in one structure, miniaturize the total size and further comprise the IC in the same structure.
A compact 24 GHz radar sensor for vehicle sideway-looking applications
(2005)
Ho, Tan-Hsiung
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
A compact 24 GHz short range radar sensor for sideway-looking applications is designed within a dimension of 60 x 45 x 30 mm(3). This dimension is acceptable to be integrated into the right/left mirror of a small automobile. The measurement result of the radar RF circuits shows a maximal output power of 5 dBm and phase noise better than -80 dBc/Hz within the whole operation frequency from 24 to 24.25 GHz. The integrated sensor together with the DSP gives a detection range of 15 meters with distance and speed resolution of 0.75 meter and 2.5 km/hr respectively.
A Compact Design of Antenna Feed for 6 M S/X-Bands Mono-Pulse Auto-Tracking Ground Station
(2015)
Lee, Yun-Jui
;
Huang, Vincent
;
Yang, Ru-Muh
;
Hsu, Ti-Hsiang
;
Chen, Ming-Hui
A compact S-band auto-tracking antenna feed for 6 m mono-pulse auto-tracking ground station is presented. It is designed to reduce the effect of blockage of the antenna systems and modify the orientation angle of the main reflector to align antenna boresight with a satellite. A circular waveguide is designed to connect to the septum polarizer for communication between the earth and LEO satellite. Based on the circular waveguide as an inner metal, a cylindrical metal is added as an outer metal to form a coaxial line for tracking LEO satellite. The uplink band of the antenna feed is from 2.025 to 2.12 GHz and the downlink band is from 2.2 to 2.3 CHz. The results show that the antenna gain of 6 m reflector is about 39.7 dBic and the 1-dBbeamw idth is 1 degree. The polarization isolation between sum and difference patterns is larger than 30 dB, and the axial ratio is lower than 1.1 dB within +/- 0.5 degree range.
A Compact Dual-Band Filtering Microstrip Antenna with the Same Polarization Planes
(2012-01-01)
Lee, Yun-Jui
;
Cao, Gang-Wei
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
A novel compact dual-band filtering antenna operated in WLAN bands is presented. The proposed design is composed of a slot-loaded patch and a half-wavelength steppedimpedance resonator with the same apertured ground. Fullwave simulator HFSS is used to extract the coupling coefficients in order to determine the physical dimension of the apertures. The antenna provides good selectivity and the same polarization planes in 2.4 GHz and 5.2 GHz bands. The measurement results agree with the simulated ones.
A Compact Dual-Band Filtering Microstrip Antenna with the Same Polarization Planes
(2012-01-01)
Lee, Yun-Jui
;
Cao, Gang-Wei
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
A novel compact dual-band filtering antenna operated in WLAN bands is presented. The proposed design is composed of a slot-loaded patch and a half-wavelength steppedimpedance resonator with the same apertured ground. Fullwave simulator HFSS is used to extract the coupling coefficients in order to determine the physical dimension of the apertures. The antenna provides good selectivity and the same polarization planes in 2.4 GHz and 5.2 GHz bands. The measurement results agree with the simulated ones.
A Compact Dual-Band Pattern Diversity Antenna by Dual-Band Reconfigurable Frequency-Selective Reflectors With a Minimum Number of Switches
(2013-02-01)
Ko, Chih-Hsiang
;
Tarn, I. -Young
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
A novel compact dual-band pattern diversity antenna is proposed. Dual-band reconfigurable frequency-selective reflectors are designed and applied to form a right-angle corner reflector antenna with reconfigurable patterns. With only one switch, the reconfigurable frequency-selective reflector can be controlled to be transmissive or reflective to vertically polarized waves at 2.45 and 5.25 GHz. By changing the combinations of the switch states, multiple patterns can be obtained. A dual-band feeding antenna designed via using the coupling effects is made to achieve well-matching conditions in all circumstances corresponding to various switch states at both frequencies. The measured results show good agreement with the calculated ones and demonstrate good pattern diversity virtues.
A Compact Edge-Fed Filtering Microstrip Antenna with 0.2 dB Equal-Ripple Response
(2009)
Lin, Chin-Kai
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
A compact microstrip antenna with a second order 0.2 dB equal-ripple response and 4 % fractional bandwidth is proposed. This design follows the synthesis process of the bandpass filter. The radiating patch is fed by a new edge-fed gap-coupling mechanism. The coupling section excites the antenna, and it can be an admittance inverter for the filter design as well. Moreover, it does not occupy any additional circuit area. The proposed antenna has the size of 0.6 lambda(g) x 0.6 lambda(g), where lambda(g) is the guiding wavelength in the substrate. The antenna provides good selectivity, flat in-band antenna gain response, and good out-band rejection. The measurement results agree with the simulated ones.
A Compact Filtering 180 degrees Hybrid
(2011-12-01)
Lin, Chin-Kai
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
A novel compact filtering 180 hybrid utilizing coupled resonators is presented. The equivalent-circuit structure is just like a bandpass filter, thus the frequency response is filter-like. The sum and difference port operations respectively correspond to the symmetric and antisymmetric states; therefore, isolation between sum and difference ports is accomplished by geometrical symmetry. The synthesis method of the filtering 180 hybrid is illustrated. The proposed structure is decomposed into one power divider and one balun, which are designed separately. A second-order filtering 180 hybrid prototype centered at 2.4 GHz with 0.2-dB Chebyshev equal-ripple response and 10% fractional bandwidth is demonstrated. The passband insertion loss is about (3.0 + 0.7) dB, and the isolation between the sum and difference port is greater than 20 dB. Magnitude imbalance is less than 1 dB and phase imbalance is within 2 degrees. Good agreement between simulation and experimental results is achieved.
A Compact Filtering Microstrip Antenna With Quasi-Elliptic Broadside Antenna Gain Response
(2011)
Lin, Chin-Kai
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
Design, fabrication, and measurement of a compact filtering microstrip antenna with second-order quasi-elliptic broadside antenna gain response are presented. A U-shape radiating patch is excited by a T-shape resonator through an inset coupling structure. The U-shape patch acts as a radiator as well as the last stage of the filter, and the inset coupling structure can be treated as the admittance inverter in filter design. The design procedure follows the circuit approach-synthesis of bandpass filters. The broadside gain of the filtering antenna has two poles in passband and two broadside radiation nulls (zeros) at the band edges for improving selectivity. Compared to the conventional inset-fed microstrip antenna, with a little extra circuit area, the proposed filtering antenna has a flatter passband response, better frequency skirt selectivity, and almost twice wider bandwidth. The measurement result shows a good agreement with the simulations.
A Compact MIMO antenna System with Three Closely Spaced Multi-band Antennas for WLAN Application
(2007)
Lin, Ming-Ta
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
In this paper, a MIMO antenna system is designed for multi-band Wireless local area network (WLAN) application with standards of IEEE 802.11a/b/g/j. As shown in Fig. 1, three printed antennas, each covering the frequency bands of 2.45, 4.9, 5.25, 5.75 GHz, are designed in a compact area of 1 x h = 48mm x 28mm, which is a suitable size for PC card application. The measurement results show 10-dB return loss with bandwidth more than 350MHz in the 2.45GHz frequency band and more than 1.2GHz in the 5GHz frequency band. In addition, the radiation pattern of these antennas is complementary in all directions to realize pattern diversity. The coupling between any two of these antennas is below -8.5dB. The proposed antenna has the properties of good performance, compact size, low profile, and low cost. Hence, it is suitable for practical MIMO applications in a WLAN system.
A Compact Printed Filtering Antenna Using a Ground-Intruded Coupled Line Resonator
(2011-10-01)
Chuang, Chao-Tang
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
A compact printed filtering antenna with high bandedge gain selectivity is presented. Occupying about the same substrate area as a conventional antenna, the proposed structure not only serves as a radiator but also a second-order bandpass filter, with one filter pole provided by a Gamma-shaped antenna and the other by a newly proposed coupled line resonator. High band-edge selectivity is achieved due to two additional stop-band transmission zeros provided by the coupled line resonator. To minimize the required area and reduce the spurious radiation, a coupled line structure composed of a microstrip line and a coplanar waveguide by broadside coupling is adopted and intruded into the Gamma-shaped antenna area. According to the filter specifications, a design procedure for the proposed filtering antenna is depicted in detail. One example at 2.45 GHz with a second-order Chebyshev bandpass filter of 0.1 dB equal-ripple response is tackled. As compared to the conventional Gamma-shaped antenna, the proposed filtering antenna not only possesses a similar antenna gain but also provides better bandedge gain selectivity and flat passband gain response. The measured results, including the S-parameters, total radiated power, and antenna gains versus frequency, have good agreement with the designed ones.
A Compact Simple Structured Filtering Antenna Utilizing Filter Synthesis Technique
(2010-01-01)
Lin, Chin-Kai
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
A compact simple structured filtering antenna and its synthesis method are presented in this paper. The filtering antenna is composed of an inverted-L antenna and a quarter-wavelength transmission line which are modeled by a series RLC resonator and a shunt LC resonator, respectively. Thus, the overall filtering antenna is modeled by the prototype bandpass filter. The detail synthesis procedures are introduced. The filtering antenna is printed on one side of the FR4 substrate that structure is extremely simple. The filtering antenna is designed at 2.45 GHz with 20% bandwidth. The far-field antenna gain is omnidirectional on its H-plane, and it maintains the averaged value around 1 dBi within the passband. The measurement results show good agreement with the simulations.
A compact slot antenna utilizing a right/left-handed transmission line feed
(2008-03-01)
Wang, Yu-Shin
;
Hsu, Min-Feng
;
Chung, Shyh-Jong
;
電信工程研究所
;
Institute of Communications Engineering
A novel compact planar antenna utilizing cascaded right/left-handed transmission lines is proposed. The significance of layout planning with respect to radiation is investigated and discussed in this paper. Two segments of transmission lines of the same electrical length with opposite signs are cascaded to provide zero phase at the operation frequency. The closed-form formulas for the equivalent circuit of a transmission line are used for circuit design. Both antenna layout and radiation mechanism are discussed. For experimental demonstration, the proposed antenna operating at 2.45 GHz was implemented on an FR4 substrate. The topology using several patches has quite smaller size than the conventional patch antenna. Besides, a fairly omnidirectional radiation pattern was measured.
A Crossed-slot Coupled Patch Antenna Array with Wedge Design for DBS Reception
(2008)
Wang, Yu-Shin
;
Tsai, Y. -Y.
;
Chung, Shyh-Jong
;
交大名義發表
;
National Chiao Tung University
A Dielectric Lens Antenna Feeding with Microstrip Patch Antennas for 77GHz Long Range Radar Application
(2012)
Wang, Hsiao-Ning
;
Huang, Yen-Tse
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
A dielectric lens antenna feeding with microstrip patch antennas for long range radar application is presented. Using the microstrip patch antenna to feed the lens antenna is easy to implement due to its simple and compact size. Besides, the lens antenna can be easily achieved high gain and low side lobes. To achieve broader field of view for the radar application, two feeding microstrip patch antennas are utilized, and each of which has 10 degree of half-power beamwidth covering field of view of 20 degree. The measurement peak gain, half-power beamwidth, and side-lobe level are 20.2 dBi, 9 degree, and -16 dB, respectively. The measurement results show the input impedance of the proposed lens antenna is well matched to 50 Omega. All the measurement and simulated results are in good agreement.