A Double-Sided Parallel-Strip Line Push–Pull Oscillator

Chen, J.-X.; Lau, Kwok Wai; Chan, Kwok Hung; Chin, Chun-Chieh; Xue, Quan; Chan, Chi Hou

doi:10.1109/lmwc.2008.922124

Cited by 23 publications

(11 citation statements)

References 10 publications

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“…The most common low phase noise oscillator integrates with single highquality-factor (high-Q) resonator such as dielectric resonator [6]. The microwave oscillator achieves the frequency stabilization with the employment oft these high-Q resonators as a popular technique in the series feedback configuration [3]. The microwave oscillator can also be implemented by placing the bandpass filter in the feedback path for frequency selection in the parallel feedback configuration.…”

Section: Bandpass Filtermentioning

confidence: 99%

“…Two oscillator configurations can be generalized for microwave oscillator design using three-terminal transistors: series feedback and parallel feedback [6]. The series feedback topology is more suitable for wideband oscillation generation while the parallel feedback topology is more suitable for narrowband signal generation like WPT system for its lower phase noise with the insertion of high quality factor resonator [3,11]. Therefore, this paper presents a unit of injection-locked antenna array and demonstrate that such a small unit can be scaled up to large scale array to implement a WPT system that meets the system requirement with reduced bill-of-materials (BOM).…”

Section: Introductionmentioning

confidence: 99%

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Design of Continuous Beam Steerable and Scalable Unit Module for Wireless Power Transmission Using Injection-Locked Oscillator Array

Zhang¹,

Wang²,

Teo³

2016

PIER C

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Long-range wireless power transmission (WPT) is implemented with the beamforming using the phased array transmitter technology, which has been extensively applied in the radar systems. The cost of a conventional phased array transmitter module scales up in proportion to the number of antenna elements, as the massive number of transmit channels results in the increasing complexity of hardware and feeding antenna elements. Besides, the conventional phase-shifting transmitter architecture has lower DC to RF power conversion efficiency due to the insertion loss of power combining network at microwave frequency. In this paper, the concept of spatial power combining transmitter is utilized, and the upconversion circuit is greatly simplified to an injection locked oscillator. Our WPT system is implemented with the technology of oscillator array antenna at 2.4 GHz, which converts DC power to RF power and radiates into the air directly. The feedback voltage controlled oscillator (VCO) is implemented as the microwave source using a off-the-shelf bandpass filter, and the external signal is injected to the oscillator via a microstrip coupler. The oscillator core shows the DC-to-RF conversion efficiency of 45.87% with the injected power of 0 dBm at 2.4 GHz. Then the digital phase shifter is used to phase shifting the injected signal to extend the beam coverage. From the link budget analysis, the overall DC-to-DC efficiency of our highly-integrated system shows 1.5 times (0.22%) of the conventional phased array (0.15%) when the separation between the transmit array and the receive horn antenna is 1.2 meters. Therefore, as an modularized array, the proposed system demonstrates the promising capability of upscaling to an efficient massive array with greatly reduced bill-of-materials (BOM).

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Section: Bandpass Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Continuous Beam Steerable and Scalable Unit Module for Wireless Power Transmission Using Injection-Locked Oscillator Array

Zhang¹,

Wang²,

Teo³

2016

PIER C

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“…Therefore, the two sub-oscillators generate differential fundamental signals [10], and the frequency and amplitude of the output signals are identical. The output signals i osc1 and i osc2 can be expressed by (1) and (2) shown as follows [12].…”

Section: Psl Differential Oscillatormentioning

confidence: 99%

“…Recently, several differential oscillators [6][7][8][9][10][11][12] have been extensively developed due to their improved performance such as harmonic suppression, which is desirable in most microwave systems because the most common cause of internally generated interference is harmonics of the oscillator, especially the second harmonics [13]. In these differential oscillators [7][8][9], the two sub-oscillators sharing a common resonator that exhibits an odd-mode resonance is used to couple the two sub-oscillators in anti-phase.…”

Section: Introductionmentioning

confidence: 99%

A Parallel-Strip Line Differential Oscillator with High Suppression of Second Harmonics

Chen

Shi

Bao

et al. 2009

Journal of Electromagnetic Waves and Applications

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In this paper, a differential oscillator using parallel-strip line (PSL) with an inserted ground plane is proposed. Its two identical sub-oscillators on the opposite sides of a dielectric substrate, sharing a common PSL resonator and common ground plane in the middle of the substrate, generate anti-phase fundamental signals and inphase second harmonics. At the common PSL output, the second harmonics are inherently cancelled out while the fundamental signals are well combined. The combination circuits, as required by the conventional differential circuits, are no longer needed. To further 2220 Chen et al.enhance the suppression of the second harmonics, the inset length of the ground plane into the PSL resonator is optimized to make the second harmonics be suppressed inside each sub-oscillator.

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“…Many different types of microwave components have been designed by researchers using DSPSL [8][9][10]. DSPSL has been introduced to filter balun design for size reduction [11], and two transmission zeros exist around the passband.…”

Section: Introductionmentioning

confidence: 99%

Realization of Microstrip Bandpass Filter Balun Using Double-Sided Parallel-Strip Line With Novel Coupling Scheme

Li¹,

Li²

2013

PIER Letters

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In this paper, we propose a microstrip filter balun adopting double-sided parallel-strip line (DSPSL) with a conductor plane inserted in the middle of the substrate. Fed by the DSPSL at input port, two microstrip filters on top and bottom layers are excited simultaneously, with the frequency-independent out-of-phase feature obtained between two output ports. The proposed filter balun exhibits excellent performance with good frequency selectivity because of multiple transmission zeros generated by a new coupling scheme. Finally, a filter balun sample is designed and fabricated, and good agreement is obtained between its measured and simulated Sparameters.

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A Double-Sided Parallel-Strip Line Push–Pull Oscillator

Cited by 23 publications

References 10 publications

Design of Continuous Beam Steerable and Scalable Unit Module for Wireless Power Transmission Using Injection-Locked Oscillator Array

Design of Continuous Beam Steerable and Scalable Unit Module for Wireless Power Transmission Using Injection-Locked Oscillator Array

A Parallel-Strip Line Differential Oscillator with High Suppression of Second Harmonics

Realization of Microstrip Bandpass Filter Balun Using Double-Sided Parallel-Strip Line With Novel Coupling Scheme

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