Phase Noise Reduction of Microwave HEMT Oscillators Using a Dielectric Resonator Coupled by a High Impedance Inverter

Lee, Moon-Que Lee; Ryu, Kwangyeol; Yom, In-Bok

doi:10.4218/etrij.01.0201.0401

Cited by 16 publications

(2 citation statements)

References 2 publications

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“…The reactance slope of the DR coupled by a high-characteristic-impedance inverter of 80⍀ is steeper than that of the DR with a low-characteristic-impedance inverter of 50⍀. This means that the phase noise characteristics will be improved by using a high-impedance inverter [6].…”

Section: A Low-phase-noise Vcdromentioning

confidence: 99%

Development of EQM (engineering qualified model) local oscillator for KA‐band satellite transponder

Ryu

Lee

Yom

et al. 2003

Micro & Optical Tech Letters

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VCDRO by coupled microstriplines with a varactor diode has been demonstrated. Compared with a conventional VCDRO, the proposed VCDRO exhibits phase-noise reduction of more than 8 dBc/Hz. The proposed VC-DRO design and fabrication techniques seem to be applicable in many space and commercial products, such as the Ka-band satellite receiver, wireless LAN, and mobile-communication systems. Applying this idea to MESFET or HBT oscillators will also obtain better phase-noise-performance enhancement because these devices have an extremely low flicker noise. INTRODUCTIONDespite of the great improvements of integrated circuits, waveguides are still essential parts of millimeter-wave technology. Due to their low-loss characteristic, they are often used for antenna or filter design, as well as for connecting the different parts of circuits. Nevertheless, monolithic integrated circuits and photonics devices are increasingly being developed in the mm-wave area. Therefore microstrip-to-waveguide transitions are critical for an efficient integration of waveguides with planar circuit. Many types of transitions are known, such as the probe type transition [1], the transition via antipodal finline [2], or via a ridged waveguide [3], and they provide reasonably good results; but these transitions are designed to work at the Ka-band or lower frequencies, or they might be too large for integrated circuits. One solution in the mm-wave band has been proposed and tested [4]. It is based on slot-coupled antennas radiating into a waveguide. The difficulty of fixing the small substrate in the waveguide has been overcome by making a step in it. Instead of modifying the waveguide, we propose a E-mode coupling-based transition that consists of inserting a small microstrip antenna inside a standard W-band waveguide, as shown in Figure 1. It is similar to the probe-type transition, but the orientation of the probe (antenna) is parallel to the electric field of the propagating TE 10 mode in the waveguide. The purpose of this change is to improve the performance of the transmission at the working frequency.In this paper, we present the design and measurements of the back-to-back transition based on the principle described above within the W-band. Transmission losses due to the relatively long microstrip line used for the back-to-back transitions have been measured on wafer. DESIGN OF TRANSITIONThe aim of the design is to build a transition requiring a minimum modification of the waveguide as shown in Figure 1. The microstrip line shown in Figure 2 consists of two parts: the microstrip line outside the waveguide that is 50⍀ and the one inside the WR-10 waveguide that is enlarged (patch antenna) like a disk sector. The transition, based on the electromagnetic coupling of the TE 10 propagating mode in the standard WR10 waveguide, is performed via a patch antenna. It is printed on an alumina substrate with the ground plane removed on the other side. Furthermore, it has to be thin enough to avoid surface-wave propagation modes. Its shape is crucial ...

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Section: A Low-phase-noise Vcdromentioning

confidence: 99%

Development of EQM (engineering qualified model) local oscillator for KA‐band satellite transponder

Ryu

Lee

Yom

et al. 2003

Micro & Optical Tech Letters

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“…To increase bandwidth of L-band LNA, the circuit is designed using cascaded and cascoded techniques. The second challenge is to achieve a low phase noise, spurious free signal with a sufficient power level of voltage controlled oscillator (VCO) [4], [7]. Therefore, the local oscillator use voltage controlled oscillator combine phase locked loop frequency synthesizer.…”

Section: Introductionmentioning

confidence: 99%

Design of a Front-End for Satellite Receiver

Hoi¹,

Lanh²,

Trường³

et al. 2016

IJECE

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<p>This paper focuses on the design and implementation of a front-end for a Vinasat satellite receiver with auto-searching mechanism and auto-tracking satellite. The front-end consists of a C-band low-noise block down-converter and a L-band receiver. The receiver is designed to meet the requirements about wide-band, high sensitivity, large dynamic range, low noise figure. To reduce noise figure and increase bandwidth, the C-band low-noise amplifier is designed using T-type of matching network with negative feedback and the L-band LNA is designed using cascoded techniques. The local oscillator uses a voltage controlled oscillator combine phase locked loop to reduce the phase noise and select channels. The front-end has successfully been designed and fabricated with parameters: Input frequency is C-band; sensitivity is greater than -130 dBm for C-band receiver and is greater than -110dBm for L-band receiver; output signals are AM/FM demodulation, I/Q demodulation, baseband signals.</p>

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A low‐phase‐noise local oscillator for a Ka‐band satellite transponder

Ryu

Lee

Yom

et al. 2003

Micro & Optical Tech Letters

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ture can easily be adjusted by chancing the width of the buried ground strip. This feature will be useful for the design of the CMBCCPW circuit. REFERENCES 1. G. Ghione and C. Naldi, Coplanar waveguide for MMIC application: Effect of upper shieldings, conductor backing, finite-extent ground planes, and line-to-line coupling, IEEE Trans Microwave Theory Tech MTT-35 (1987), 260 -266. 2. S.S. Bedair and I. Wolff, Fast and accurate analytic formulas for calculating the parameters of a general broadside-coupled coplanar waveguide for (M)MIC applications, IEEE Trans Microwave Theory ABSTRACT: A low-phase-noise local oscillator (LO) is developed for a Ka-band satellite transponder. A novel dielectric resonator-voltage controlled oscillator (DR-VCO) is also designed by using a high-impedance inverter coupled with a dielectric resonator to improve the phasenoise performance out of the loop bandwidth. This LO performs the harmonic suppression characteristics above 43.83 dBc and requires 2.6watt power consumption. The phase-noise characteristics are exhibited as Ϫ102.5 dBc/Hz at 10-KHz offset frequency and Ϫ104.0 dBc/Hz at 100-KHz offset frequency, respectively, with output power of 13.50 dBm Ϯ 0.33 dB over a temperature range of Ϫ20 ϳ ϩ70°C.Key words: local oscillator; phase noise; Ka-band satellite transponder wave HEMT oscillators using a dielectric resonator coupled by a high impedance inverter, ETRI J 23 (2001), 199 -201. ABSTRACT: This paper presents a concept of a dual-band dual-port microstrip base station antenna for mobile telecommunication systems. The main part of the paper describes considerations on the antenna array configuration as well as antenna pattern synthesis. As an application example, a model of a dual-band dual-port microstrip antenna for GSM900 and GSM1800 systems, along with measured data, are described.

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Phase Noise Reduction of Microwave HEMT Oscillators Using a Dielectric Resonator Coupled by a High Impedance Inverter

Cited by 16 publications

References 2 publications

Development of EQM (engineering qualified model) local oscillator for KA‐band satellite transponder

Development of EQM (engineering qualified model) local oscillator for KA‐band satellite transponder

Design of a Front-End for Satellite Receiver

A low‐phase‐noise local oscillator for a Ka‐band satellite transponder

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