A novel millimeter-wave 35-GHz bandpass filter using coplanar waveguide structure is fabricated in a 0.18-?m standard complimentary metal oxide semiconductor process. The conductor-backed half-wavelength resonators are utilized to realize stopband characteristics at desired frequencies. A series LC resonant circuit can generate one transmission zero located at 58 GHz. It is also observed that the parasitic effect can create another transmission zero at 80 GHz. Furthermore, the transmission zero at 66 GHz is designed with the use of a shorter conductor-backed resonator. The selectivity of the proposed filter is much improved. Without including the dummy metal, the chip size of the proposed filter is 0.225 × 0.55 mm2. The good agreement between simulation and measurement is obtained.

A Millimeter-Wave CPW CMOS On-Chip Bandpass Filter Using Conductor-Backed Resonators

A novel configuration of balanced frequency InGaAs pseudomorphic high electron mobility transistor (PHEMT) monolithic microwave integrated circuit (MMIC) tripler is proposed. A resonant LC filter is used to eliminate the fundamental frequency and a phase delay line is employed to suppress the second harmonic. The separation of the independent phase shifters makes the tripler more compact and flexible. The conversion loss of the tripler operating from 12 to 36GHz is less than 9.4dB at 9-dBm input power. As compared to the third-harmonic frequency, the fundamental frequency is suppressed more than 21.4dB while for the second harmonic is more than 22.3dB at 36GHz

A 12-36GHz PHEMT MMIC balanced frequency tripler

A novel lowpass filter using spiral compact microstrip resonant cells (SCMRCs) for size reduction is presented. Four SCMRC resonators as open stub lines are connected at both sides of an SCMRC resonator so that the port impedance at the lowpass band is matched to 50 /spl Omega/. The proposed lowpass filter has compact circuit size and wide stop-band. A demonstration lowpass filter is designed, fabricated and measured. It shows low insertion loss, flat response in the lowpass band and wide stop-band.

Compact lowpass filter using spiral compact microstrip resonant cells

A new odd-order frequency multiplier topology is demonstrated in this work that uses a subharmonic mixer to realize a frequency tripler. A feedforward circuit is used for fundamental cancellation at the output and eliminates the need for filtering structures. For demonstrative purposes, and to validate the concept, a 1-3-GHz proof-of-concept frequency tripler circuit was fabricated. The tripler circuit achieved a measured output fundamental suppression of up to 30 dB below the third harmonic and a conversion gain of up to 3 dB. The circuit was implemented in CMOS 0.18-mum technology and the chip area was 0.8 mm2 including bonding pads.

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A Frequency Tripler Using a Subharmonic Mixer and Fundamental Cancellation

A compact-size coplanar waveguide (CPW) bandpass filter (BPF) is proposed. In this study, we use the bended stub with novel folded skill to improve the three parallel coupled-lines structure of BPF for N = 1. It gets the sharp transition band (TB) and reduces the dimension of the circuit by 66.67% at 2.45 GHz. Its center frequency can be shifted easily by adjusting the interfaces of SS and S'S' simultaneously. It is very useful for applications in the wireless communication systems.

http://ieeexplore.ieee.org/iel5/7260/27188/01208420.pdf

Compact-size coplanar waveguide bandpass filter

Proposes a novel folded skill and a simpler method than that of older methods. The advantages of this new structure reveals a better skirt factor than that of the conventional folded /spl lambda//4 series open stub, and it reduces the folded area of the conventional structure by at least 50%. Besides, by using the new folded /spl lambda//4 open stub to realize a bandpass filter, the size of the circuit will be reduced greatly and achieve better stopband rejection.

Novel reduced-size coplanar-waveguide bandpass filter using the new folded open stub structure

This letter presents a novel design for a small-size coplanar waveguide frequency tripler. In this study, a new BPF has been replaced the conventional stub lines in the output termination of the multiplier. Not only enhance the performance of the tripler, but also reduce the whole circuit size. to 2.125/spl times/2.275 cm/sup 2/ in the frequency 0.8/2.4 GHz, The spurious suppressions are 37.48, 33.38, and 32.08 dBc for the 1st, 2nd, and 4th harmonics, respectively. It reveals the best output power of -1.92 dBm for a 0 dBm input signal and maximum conversion gain of -1.92 dB. It is very useful for applications in the wireless communication and radar systems.

Novel design for small-size coplanar waveguide frequency tripler

This paper proposes a novel folded skill and the simpler way than that of the old methods. The advantage of this new structure reveals a better skirt factor than that of the conventional folded /spl lambda//4 series open stub, and reduces the folded area of the conventional structure by 50% at least. We can also increase the repeats of the fold to make the skirt factor better than that of the single folded structure.

New coplanar-waveguide folded /spl lambda//4 open stub structure

This letter presents a novel design for a small-size coplanar waveguide frequency tripler. In this study, a new BPF has been replaced the conventional stub lines in the output termination of the multiplier. Not only enhance the performance of the tripler, but also reduce the whole circuit size. to 2.125 2.275 cm in the frequency 0.8/2.4 GHz, The spurious suppressions are 37.48, 33.38, and 32.08 dBc for the 1st, 2nd, and 4th harmonics, respectively. It reveals the best output power of dBm for a 0 dBm input signal and maximum conversion gain of dB. It is very useful for applications in the wireless communication and radar systems. Index Terms—CPW structure, frequency multiplier, small-size BPF.

http://ieeexplore.ieee.org/iel5/7260/28200/01261773.pdf

Hsien-Ku Chen

Papers

Compact-size coplanar waveguide bandpass filter

Novel reduced-size coplanar-waveguide bandpass filter using the new folded open stub structure

Novel design for small-size coplanar waveguide frequency tripler

New coplanar-waveguide folded /spl lambda//4 open stub structure

Novel Design for Small-Size Coplanar