A two-layer design of elliptic filters with enhanced bandwidth is introduced. Larger bandwidths a... more A two-layer design of elliptic filters with enhanced bandwidth is introduced. Larger bandwidths are achieved by placing square resonators on different planes to increase the strength of their coupling. Square resonators are used to control the sign of the coupling coefficient (magnetic or electric). A fourth order elliptic filter with a bandwidth of 320 MHz at 2.5 GHz is designed to demonstrate the validity of the approach. A second two-layer 4/sup th/ order elliptic filter based on a different coupling scheme and topology is also presented.
IEEE Transactions on Microwave Theory and Techniques, 2006
In-line pseudoelliptic band-reject filters with nonresonating nodes (NRNs) and/or phase shifts ar... more In-line pseudoelliptic band-reject filters with nonresonating nodes (NRNs) and/or phase shifts are introduced. It is shown that general band-reject filters with arbitrarily placed reflection zeros (RZs) can be designed by both classes. A more general low-pass network, which contains both NRNs and phase shifts, is introduced. Prior to implementation, the network, which includes phase shifts, is optimized to take into account dispersion effects and better fit the specifications. Example filters in microstrip and waveguide technologies are presented. Experimental validation of the method is demonstrated by a novel third-order waveguide band-reject filter at Ka-band with asymmetric response. It provides a transfer characteristic with all three RZs below the stopband. Excellent coincidence of the computed and measured responses of the realized filter-obtained without any post-manufacturing tuning-is achieved
IEEE MTT-S International Microwave Symposium Digest, 2005., 2005
The paper presents a new class of dual-mode microstrip filters based on triangular dual-mode micr... more The paper presents a new class of dual-mode microstrip filters based on triangular dual-mode microstrip loop resonators. The triangular shape of the loop eases the design of dual-mode filters by allowing simultaneous edge coupling to the two dual-modes from a single feed (microstrip). Two consecutive dual-mode loop resonators are also edge coupled to each other without changing the triangular shape of the resonators. Dual-mode pseudo-elliptic bandpass filters of orders two and four are designed and presented.
A new design of elliptic band reject microwave filters in microstrip technology is presented. Ins... more A new design of elliptic band reject microwave filters in microstrip technology is presented. Instead of the standard in-line configuration, compact filters are designed by exploiting the same coupling schemes that have been extensively used in designing elliptic and pseudo-elliptic bandpass filter with source-load coupling. Elliptic band reject filters of order 2 and 4 are designed using a commercial software package. To demonstrate the validity of the approach a prototype filter of fourth order was fabricated and measured.
This article aims to optimize the signal integrity of high-bandwidth memory (HBM) interconnects i... more This article aims to optimize the signal integrity of high-bandwidth memory (HBM) interconnects in silicon interposer layer that connect the memory and SoC (CPU, GPU). Based on the second-generation enhanced version of high-bandwidth memory (HBM2e), a new wiring layout with greatly reduced coupling coefficient is proposed to mitigate the crosstalk problems. Then, by taking advantage of mismatched source and load impedances, the optimized characteristic impedance of the interconnects is designed to achieve the best eye diagram for the latest third-generation high-bandwidth memory (HBM3). As a result, the eye opening of the original HBM2E can be improved from 11% to 51%, or 4.6 times improvement, for the high-speed transmission at 6.4GHz with risetime 15ps.
This paper presents the system simulation for the signal integrity of the electro-optic interconn... more This paper presents the system simulation for the signal integrity of the electro-optic interconnects operating in the high data rate. The simulation combines ADS circuit simulation for electrical part and RSoft for the optical part. The electrical design using equalizer and PAM4 has been established in the RSoft model for optical interconnects analysis. Based on the constructed models, the systems under different optical sources and modulation types have been analyzed in details. With appropriate electric design in equalizer and PAM4 modulation and selected optical components, the whole system can successfully support the data transmission up to 50Gbps.
This paper presents a 2nd-order Chebyshev bandpass filter with tunable constant fractional bandwi... more This paper presents a 2nd-order Chebyshev bandpass filter with tunable constant fractional bandwidth. The filter is designed using a short-stub loaded dual-mode resonator, which readily achieves a constant bandwidth while tuning. Two sets of varactors are used for tuning the center frequency and the return loss level. Within the tunable range of the varactors, the frequency tuning range of the proposed filter is from 1.7GHz to 2.1GHz with a 3.5% constant fractional bandwidth. Additionally, 20 dB return loss and insertion loss below 1.64dB can be achieved over the entire tuning range.
This paper discusses the enhancement on noise suppression of split power planes over an ultra wid... more This paper discusses the enhancement on noise suppression of split power planes over an ultra wide band from DC to several GHz by using electromagnetic band-gap (EBG) structures. Also proposed are a modified design formula and a new spiral EBG structure for size reduction.
A high-precision positioning prototype suitable for the Unmanned Aircraft System Traffic Manageme... more A high-precision positioning prototype suitable for the Unmanned Aircraft System Traffic Management (UTM) system is proposed. Comprised of Global Positioning System (GPS), Ultra-wideband (UWB), and Long Range (LoRa) WAN capabilities, our prototype effectively improves GPS accuracy by utilizing high-precision UWB distance measurement. A set of calibration procedures can reduce the error of UWB distance measurement within 10cm accuracy. Moreover, a novel cost function is proposed so that the longitude, latitude, and relative height errors of GPS can be effectively improved, with relative altitude error reduced from 4. 03m to 1. 74m in particular. Finally, our UWB-assisted positioning prototype significantly enhances GPS localization accuracy. The outdoor relative position error between devices under test (DUTs) can be reduced from 6 m to within 10 cm.
A two-layer design of elliptic filters with enhanced bandwidth is introduced. Larger bandwidths a... more A two-layer design of elliptic filters with enhanced bandwidth is introduced. Larger bandwidths are achieved by placing square resonators on different planes to increase the strength of their coupling. Square resonators are used to control the sign of the coupling coefficient (magnetic or electric). A fourth order elliptic filter with a bandwidth of 320 MHz at 2.5 GHz is designed to demonstrate the validity of the approach. A second two-layer 4/sup th/ order elliptic filter based on a different coupling scheme and topology is also presented.
IEEE Transactions on Microwave Theory and Techniques, 2006
In-line pseudoelliptic band-reject filters with nonresonating nodes (NRNs) and/or phase shifts ar... more In-line pseudoelliptic band-reject filters with nonresonating nodes (NRNs) and/or phase shifts are introduced. It is shown that general band-reject filters with arbitrarily placed reflection zeros (RZs) can be designed by both classes. A more general low-pass network, which contains both NRNs and phase shifts, is introduced. Prior to implementation, the network, which includes phase shifts, is optimized to take into account dispersion effects and better fit the specifications. Example filters in microstrip and waveguide technologies are presented. Experimental validation of the method is demonstrated by a novel third-order waveguide band-reject filter at Ka-band with asymmetric response. It provides a transfer characteristic with all three RZs below the stopband. Excellent coincidence of the computed and measured responses of the realized filter-obtained without any post-manufacturing tuning-is achieved
IEEE MTT-S International Microwave Symposium Digest, 2005., 2005
The paper presents a new class of dual-mode microstrip filters based on triangular dual-mode micr... more The paper presents a new class of dual-mode microstrip filters based on triangular dual-mode microstrip loop resonators. The triangular shape of the loop eases the design of dual-mode filters by allowing simultaneous edge coupling to the two dual-modes from a single feed (microstrip). Two consecutive dual-mode loop resonators are also edge coupled to each other without changing the triangular shape of the resonators. Dual-mode pseudo-elliptic bandpass filters of orders two and four are designed and presented.
A new design of elliptic band reject microwave filters in microstrip technology is presented. Ins... more A new design of elliptic band reject microwave filters in microstrip technology is presented. Instead of the standard in-line configuration, compact filters are designed by exploiting the same coupling schemes that have been extensively used in designing elliptic and pseudo-elliptic bandpass filter with source-load coupling. Elliptic band reject filters of order 2 and 4 are designed using a commercial software package. To demonstrate the validity of the approach a prototype filter of fourth order was fabricated and measured.
This article aims to optimize the signal integrity of high-bandwidth memory (HBM) interconnects i... more This article aims to optimize the signal integrity of high-bandwidth memory (HBM) interconnects in silicon interposer layer that connect the memory and SoC (CPU, GPU). Based on the second-generation enhanced version of high-bandwidth memory (HBM2e), a new wiring layout with greatly reduced coupling coefficient is proposed to mitigate the crosstalk problems. Then, by taking advantage of mismatched source and load impedances, the optimized characteristic impedance of the interconnects is designed to achieve the best eye diagram for the latest third-generation high-bandwidth memory (HBM3). As a result, the eye opening of the original HBM2E can be improved from 11% to 51%, or 4.6 times improvement, for the high-speed transmission at 6.4GHz with risetime 15ps.
This paper presents the system simulation for the signal integrity of the electro-optic interconn... more This paper presents the system simulation for the signal integrity of the electro-optic interconnects operating in the high data rate. The simulation combines ADS circuit simulation for electrical part and RSoft for the optical part. The electrical design using equalizer and PAM4 has been established in the RSoft model for optical interconnects analysis. Based on the constructed models, the systems under different optical sources and modulation types have been analyzed in details. With appropriate electric design in equalizer and PAM4 modulation and selected optical components, the whole system can successfully support the data transmission up to 50Gbps.
This paper presents a 2nd-order Chebyshev bandpass filter with tunable constant fractional bandwi... more This paper presents a 2nd-order Chebyshev bandpass filter with tunable constant fractional bandwidth. The filter is designed using a short-stub loaded dual-mode resonator, which readily achieves a constant bandwidth while tuning. Two sets of varactors are used for tuning the center frequency and the return loss level. Within the tunable range of the varactors, the frequency tuning range of the proposed filter is from 1.7GHz to 2.1GHz with a 3.5% constant fractional bandwidth. Additionally, 20 dB return loss and insertion loss below 1.64dB can be achieved over the entire tuning range.
This paper discusses the enhancement on noise suppression of split power planes over an ultra wid... more This paper discusses the enhancement on noise suppression of split power planes over an ultra wide band from DC to several GHz by using electromagnetic band-gap (EBG) structures. Also proposed are a modified design formula and a new spiral EBG structure for size reduction.
A high-precision positioning prototype suitable for the Unmanned Aircraft System Traffic Manageme... more A high-precision positioning prototype suitable for the Unmanned Aircraft System Traffic Management (UTM) system is proposed. Comprised of Global Positioning System (GPS), Ultra-wideband (UWB), and Long Range (LoRa) WAN capabilities, our prototype effectively improves GPS accuracy by utilizing high-precision UWB distance measurement. A set of calibration procedures can reduce the error of UWB distance measurement within 10cm accuracy. Moreover, a novel cost function is proposed so that the longitude, latitude, and relative height errors of GPS can be effectively improved, with relative altitude error reduced from 4. 03m to 1. 74m in particular. Finally, our UWB-assisted positioning prototype significantly enhances GPS localization accuracy. The outdoor relative position error between devices under test (DUTs) can be reduced from 6 m to within 10 cm.
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Papers by Ruey-Beei Wu