FET active slotline notch antennas for quasi-optical power combining

Leverich, W. K.; Wu, Xiushan; Chang, Kai

doi:10.1109/22.245670

Cited by 9 publications

(8 citation statements)

References 15 publications

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“…The values given by the manufacturer were 1 pF, 0.5 0.03, and 1.3 V, respectively. 1 The value for decreases to 0.5 pF due to the additional bias cut required for varactor biasing, which reduces the parallelplate approximation area by one-half. A simple model was developed to determine the frequency of operation and tuning range of the varactor-tuned oscillator antenna.…”

Section: Varactor-tunable Oscillator Antennamentioning

confidence: 98%

“…1 shows the generalized oscillator circuit for a oneport active device. The impedance of the active device can be expressed as with (1) The driving-point impedance seen by the diode is the impedance presented to the diode by the load and impedancematching network. This driving-point impedance includes the diode package parasitic effects and embedding circuits.…”

Section: Oscillator Antenna Designmentioning

confidence: 99%

“…O VER THE last few years, the direct integration of oscillator and amplifiers into antenna structures has received a great deal of attention because of the potential for reduced size, weight, and cost [1]- [3]. Self-mixing oscillators [4] and self-mixing active antennas [5] have also been demonstrated, but require careful analysis of the design tradeoffs involved.…”

Section: Introductionmentioning

confidence: 99%

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An X-band self-mixing oscillator antenna for transceiver and spatial power-combining applications

Montiel

Lu²,

Chang³

1998

IEEE Trans. Microwave Theory Techn.

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The general theory for oscillator and mixer design is applied to develop an X-band self-mixing oscillator antenna. The antenna uses a Gunn diode as the active device that provides the oscillations and self-mixing operations. The circuit uses a slotline ring resonator for frequency stabilization and can be modified to include a varactor diode for wide-band frequency tuning. The circuit performance is compared with theoretical results derived from simple transmission-line models. The radiation patterns of the self-mixing oscillator antenna are also compared with those measured from a similarly configured passive antenna. Since the radiated power also serves as the local oscillator (LO) frequency for the self-mixing operation, the circuit is useful as a half-duplex transceiver. When the self-mixing operation is not required, a single oscillator antenna can be used as a transmitter and several units can be assembled in a planar array for spatial powercombining applications.

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Section: Varactor-tunable Oscillator Antennamentioning

confidence: 98%

Section: Oscillator Antenna Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An X-band self-mixing oscillator antenna for transceiver and spatial power-combining applications

Montiel

Lu²,

Chang³

1998

IEEE Trans. Microwave Theory Techn.

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“…Among active antennas, the active integrated antenna is designed to form the antenna as a passive element and an active circuit on the same substrate and (1) is small and light-weight, (2) can make the effective length of the antenna smaller, (3) can make the bandwidth large, and (4) can reduce noise and transmission loss. As the circuit for an active integrated antenna, amplifiers [2], mixers [3], oscillators [4], and so forth can be considered. Of these, an active antenna combining the oscillator using a Gunn diode or an FET is particularly important and has been extensively studied since the feed loss, an important factor at millimeter wave frequencies, is small [59].…”

Section: Introductionmentioning

confidence: 99%

“…There are techniques to construct an array to carry out quasi-optical power combining. Studies have been conducted on the locking techniques important in the power combining [4,5,9]. In practice, however, the study of the oscillator stability affecting the transmission efficiency is limited to that of the array to enhance the power coupling stability by means of a dielectric resonator [9].…”

Section: Introductionmentioning

confidence: 99%

Active antenna using a parasitic element

Mori

Arai

2001

Electron. Comm. Jpn. Pt. I

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SUMMARYRecently, various methods of using millimeter wave communication systems have attracted attention. Of these, the active antennas consisting of active circuits and antenna elements integrated together have been studied widely. In particular, the active antenna combining an oscillator using FETs has a high degree of importance due to its advantage of low loss in the feed line. However, the Q of the active antenna combining an oscillator is degraded for the oscillator since the Q of the planar antenna connected to the FET is low. In this paper, an active antenna is proposed in which a half-wave dipole parasitic element is placed between the gate and the drain of the oscillator made of an FET and a coplanar waveguide. An experimental investigation is carried out for enhancement of the stability of the oscillation frequency and improvement of the radiation pattern by means of the parasitic element. © 2001 Scripta Technica, Electron Comm Jpn Pt 1, 84(7): 5765, 2001

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