38-GHz 無線收發系統關鍵元組件技術－ 子計畫五:本地振盪電路之研製(1/3)(2/3)(3/3)
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
DOI
922219E002005
Abstract
This is a three-year project to conduct research and development of
microwave oscillator technologies. There are three major tasks involved. One is
to develop the local oscillator for the 36GHz transceiver. Two is to develop the
basic theory and experiments of oscillator array. Three is to develop the novel
applications of oscillator array.
On the basis of the phase control ability of mutually coupled oscillator
arrays, this report investigates the novel applications for the high-frequency
signal source and active antenna array systems. Both the theoretical analysis and
the experimental implement are emphasized. The three new applications
presented are an N-th harmonic oscillator, a retro-directive antenna array, and a
beam-scanning and polarization-agile antenna array. As for the local oscillator for
the 36GHz transceiver, it was given in the concise reports.
Firstly, in Chapter 3, the design concept of push-push oscillators is
extended to triple-push, quadruple-push and hence N-push harmonic oscillators.
Conventionally, this kind of problems is dealt with by linear mode analysis. The
design principle in this dissertation is based on the injection-locking theory. The
desired harmonic component can be selected by tuning the relative phases of the
coupled oscillators and the conduction angles of voltage-clamping circuits. As
the output phase-shifted signals of the coupled oscillators are properly shaped
and combined, the desired harmonic components are constructively generated
and lower-order harmonic components are suppressed. This structure can be viewed as the general case of push-push oscillators. Since the output power is
combined in a passive circuit, it does not suffer from the power limit of the
output device in the cascade structure. The circuit structure is presented and
verified experimentally in second-harmonic, third-harmonic and fourth-harmonic
oscillators.
In Chapter 4, a novel phase conjugation circuit and its application to
retro-directive antennas are presented. The phase conjugation circuit uses a
balanced circuit structure with subharmonically injection-locked self-oscillating
mixers (SILSOMs) oscillating at ω. An input signal at ω/2 is converted to its
conjugated signal with no external source required for LO signal pumping, and
the output signal frequency is locked at the same frequency of the input signal.
The developed phase conjugation circuit is implemented with active antennas to
become a retro-directive antenna array. Both the theoretical and measured results
of phase conjugation and retro-directive performance are presented.
Finally, a two-dimensional mutually coupled oscillator array is studied in
Chapter 5 for the application of a beam-scanning and polarization-agile antenna
array. In the antenna array design, the polarization agility is considered as one of
the two dimensions (or y-direction) with the other dimension (or x-direction) for
beam scanning of a two-dimensional oscillator array in x-y plane. The array
radiation direction can be scanned for the selected polarization states including
linearly polarized, left-hand and right-hand circularly polarized states.
Well-defined phase differences among oscillators for beam scanning and
polarization agility are given by utilizing the second-harmonic signal. The performances of polarization agility and beam scanning for a four-element
antenna array are verified experimentally and shown to have the potential for
adaptive antenna array applications.
Publisher
臺北市：國立臺灣大學電信工程學研究所
Type
report
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