Cheng-Ying Hsu

Design of Miniature Planar Dual-Band Filter Using Dual-Feeding Structures and Embedded Resonators

A new dual-band planar filter has been proposed. It is shown that the two transmission bands can be excited and designed using proposed resonators which combine different sizes of open-loop resonators. The main resonators control the low-band resonant frequency and the sub resonators control the high-band resonant frequency. With dual-feeding structures added, the performances of the filter such as frequency selectivity and insertion loss are much improved. The embedded resonators structure can further miniaturize the dimensions of the overall structure. The proposed dual-band filter will find applications in wireless communication circuits

70 GHz Folded Loop Dual-Mode Bandpass Filter Fabricated Using 0.18

This letter presents the design and implementation of a 70 GHz millimeter-wave compact folded loop dual-mode on-chip bandpass filter (BPF) using a 0.18 mum standard CMOS process. A compact BPF, consisting of such a planar ring resonator structure having dual transmission zeros was fabricated and designed. The size of the designed filter is 650 X 670 mum2. Calculated circuit model, EM simulated and measured results of the proposed filter operating at 70 GHz are shown in a good agreement and have good performance. The filter has a 3-dB bandwidth of about 18 GHz at the center frequency of 70 GHz. The measured insertion loss of the passband is about 3.6 dB and the return loss is better than 10 dB within the passband.

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This letter presents the design and implementation of a 24-/60-GHz millimeter-wave dual-band on-chip bandpass filter using a 0.18-mum standard CMOS process. The concept of quarter-wavelength stepped-impedance resonator (lambda/4 SIR) is utilized to realize stopband characteristics at desired frequencies and reduce the chip size. The structure of the open-circuited dual-behavior resonators (OC-DBRs) produces one passband with two transmission zeros on either side. The size of the designed filter is 1.030 times 0.590 mm2.

m Standard CMOS Technology

In this paper, coupled open stub circuits are applied for providing band notch in filter design. Even- and odd-mode excitations for a coupled line can be represented as the equivalent capacitance networks. The rejection bandwidth of the designed filter can be controlled by the mutual capacitance Cm . An ultra-wideband (UWB) bandpass filter with 5 GHz to 6 GHz rejection band is proposed. To inhibit the signals ranged from 5 to 6 GHz, two pairs of stepped-impedance coupled open stubs are implemented on the multiple-mode resonator (MMR) The designed UWB filter has two transmission bands. The first passband from 2.8 GHz to 5 GHz has less than 0.8 dB magnitude of insertion loss and greater than –15 dB return loss. The second passband within 6 GHz and 10.6 GHz has less than 1.5 dB magnitude of insertion loss and greater than 15 dB return loss. The rejection at 5.5 GHz is better than 50 dB. This filter can be integrated in UWB radio systems and efficiently enhance the interference immunity from WLAN.

A 24-/60-GHz CMOS On-Chip Dual-Band Bandpass Filter Using Trisection Dual-Behavior Resonators

This paper presents design and implementation of a 60-GHz millimeter-wave RFIC-on-chip bandpass filter with a 0.18-mum standard CMOS process. A planar ring resonator structure with dual transmission zeros was adopted to design this CMOS filter. The die size of the chip is 1.148 times 1.49 mm2. The measured insertion loss of a designed bandpass is less than 5 dB from 59 to 68 GHz. The investigations of sensitivity to the insertion loss and the passband bandwidth for different perturbation stub sizes are also studied. The filter has a 5-dB bandwidth of about 9 GHz at the center frequency of 64 GHz. The measured insertion loss of the passband is about 4.9 dB and the return loss is better than 10 dB within passband.

Compact Microstrip UWB Dual-Band Bandpass Filter with Tunable Rejection Band

A novel ultra-wideband (UWB) bandpass filter with 5 to 6 GHz rejection band is proposed. The multiple coupled line structure is incorporated with multiple-mode resonator (MMR) to provide wide transmission band and enhance out-of band performance. To inhibit the signals ranged from 5- to 6-GHz, four stepped-impedance open stubs are implemented on the MMR without increasing the size of the proposed filter. The design of the proposed UWB filter has two transmission bands. The first passband from 2.8 GHz to 5 GHz has less than 2 dB insertion loss and greater than 18 dB return loss. The second passband within 6 GHz and 10.6 GHz has less than 1.5 dB insertion loss and greater than 15 dB return loss. The rejection at 5.5 GHz is better than 50 dB. This filter can be integrated in UWB radio systems and efficiently enhance the interference immunity from WLAN.

Design of 60-GHz millimeter-wave CMOS RFIC-on-Chip bandpass filter

A 3-10 GHz broadband CMOS T/R switch for ultra-wideband (UWB) transceiver is presented. The broadband CMOS T/R switch is fabricated based on the 0.18 mu 1P6M standard CMOS process. On-chip measurement of the CMOS T/R switch is performed. The insertion loss of the proposed CMOS T/R Switch is about 3.1plusmn1.3dB. The return losses at both input and output terminals are higher than 14 dB. It is also characterized with 25-34dB isolation and 18-20 dBm input P1dB. The broadband CMOS T/R switch shows highly linear phase and group delay of 20plusmn10 ps from 10MHz to 15GHz. It can be easily integrated with other CMOS RFICs to form on-chip transceivers for various UWB applications

A 3-10 GHz Ultra-Wideband Bandpass Filter with 5-6GHz Rejection Band

A new dual-band planar filter has been proposed. It is shown that the two transmission bands can be excited and designed using proposed resonators which combine different size of open-loop resonators. The main resonators control the low-band resonant frequency and the sub resonators control the high-band resonant frequency. Two passbands can be easily and flexibly designed by adjusting the length of resonators. The proposed dual-band filter will find applications in wireless communication circuits.

A 3-10GHz Broadband CMOS T/R Switch for UWB Applications

A 26-/77-GHz dual-band branch-line coupler fabricated using standard 0.18-µm CMOS technology is presented. The dual-band coupler is with a compact size of 1.0 × 1.0 mm2. The simulated frequency response is to 110 GHz. The measured frequency response shows a good performance with amplitude and phase imbalnce of ± 0.5 dB and ± 5°, respectively, in the low band. The S21 in the high band is about 7.5 dB The measured isolation and the return loss are better than 15 dB within the two passbands. The on-chip coupler will be useful for the integrated design of a 26/77-GHz CMOS single-chip RF transceiver.