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Optimised Hot-Via Transition with 20 dB Return Loss for MMIC Packaging from DC to 110 GHz
Leigh E. Milner;Shyam G. Mehta;Leonard T. Hall;Simon J. Mahon;Sudipta Chakraborty;Michael C. Heimlich
A hot-via transition from a monolithic microwave integrated circuit (MMIC) to a printed circuit board (PCB) has been developed with a measured back-to-back insertion loss less than 0.88 dB and return loss higher than 20 dB from dc to 110 GHz. Two techniques are proposed to extend the maximum operating frequency of the microstrip to grounded coplanar waveguide (GCPW) transition. An oversized micros...Show More
A Broadband 25 to 42 GHz SiGe Upconverter
Leigh E. Milner;Leonard T. Hall;Sudipta Chakraborty;Charles G. Ritchie;Michael C. Heimlich
A 0.13 SiGe upconverter circuit is presented that is suitable for use in broadband millimetre-wave transmitters and active phased arrays. The circuit accepts four differential IF inputs (I+, I-, Q+, Q-) in the frequency range of DC to 13 GHz. An off-chip X-band LO passes through an on-chip tripler before being used to drive the image rejection mixer. The resultant output may be placed anywhere in ...Show More
Pattern synthesis of stub-loaded half-mode substrate-integrated leaky-wave antenna
2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting
Year: 2017 | Conference Paper |
A pattern synthesis technique for a periodically stub-loaded half-mode substrate-integrated waveguide (HMSIW) leaky-wave antenna (LWA) is studied in this paper. In this structure, the waveguide host, i.e. the HMSIW, has a fixed cross-section whilst the stub lengths in each unit-cell are varied to control the propagation constant along the guided-wave direction. The results show that pattern synthe...Show More
A 30–60 GHz SiGe transformer balun with offset radii coils for low amplitude and phase imbalance
Sudipta Chakraborty;Leigh E. Milner;Leonard T. Hall;Anthony Parker;Michael Heimlich
2017 IEEE MTT-S International Microwave Symposium (IMS)
Year: 2017 | Conference Paper |
Cited by: Papers (8)
Characterization of a wide-band transformer balun with low magnitude and phase imbalance is presented in this paper. Excellent balance over a large bandwidth is achieved by adopting two new techniques for the transformer balun design, resulting in a very low magnitude imbalance of 0.12 dB and phase imbalance of less than 1° over 30 to 60 GHz. The tradeoff between the insertion loss and the balance...Show More
Concept of a beam-steerable cavity-fed antenna with magnetic-dipole coupling elements
Nghia Nguyen-Trong;Andrew Piotrowski;Leonard Thomas Hall;Christophe Fumeaux
2017 11th European Conference on Antennas and Propagation (EUCAP)
Year: 2017 | Conference Paper |
A concept of a beam-steerable radiator based on a reconfigurable cavity antenna and coupling elements is proposed in this paper. The coupling elements are designed as magnetic dipoles which are realized using half-mode substrate-integrated cavities. Thus, the antenna exhibits vertical polarization in a planar structure. The main beam can be switched among different directions towards end-fire. Fur...Show More
Variational analysis of substrate-integrated waveguides with longitudinal slot
2017 International Applied Computational Electromagnetics Society Symposium - Italy (ACES)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
The variational analysis to solve the propagation constant of substrate-integrated waveguides with a longitudinal slot is presented in this paper. A closed-form expression for the stationary equation is given, which is solved using a well-known root-searching Newton's process. Compared to the transverse resonance method, the present analysis does not require the values of the edge impedances and t...Show More
Conformal integration of traveling-wave slot antennas in millimeter-wave regime
2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)
Year: 2017 | Conference Paper |
A design of feeding transition for conformal integration of traveling-wave slot antennas in the millimeter-wave regime is presented in this paper. The design utilizes a shielded half-mode substrate-integrated waveguide (HMSIW) bent section to provide an efficient transition from a coaxial connector to the antenna. A curved ground plane, such as the surface of a cylindrical pole, mimics an infinite...Show More
A Frequency- and Polarization-Reconfigurable Circular Cavity Antenna
Nghia Nguyen-Trong;Andrew Piotrowski;Leonard Hall;Christophe Fumeaux
The principle and experimental validation of a frequency- and polarization-reconfigurable antenna using switching PIN diodes is presented in this letter. The antenna is based on a center-fed circular cavity with switchable shorting vias along its outer edge. Turning a set of shorting vias on on one side and off on the other side creates a radiating slot with controllable length and location along ...Show More
A 25 to 45 GHz SiGe receiver MMIC
Leigh E. Milner;James T. Harvey;Michael E. Parker;Leonard T. Hall;Melissa C. Rodriguez;Michael C. Heimlich;Simon J. Mahon
2016 11th European Microwave Integrated Circuits Conference (EuMIC)
Year: 2016 | Conference Paper |
Cited by: Papers (13)
The frequency range 25-45 GHz contains point-to-point bands at 28, 32, 38 and 42 GHz, potential implementation of 5G at 28 and 39 GHz and various military applications. Traditionally, short gate length GaAs pHEMT technology has been used to develop products for these frequencies. Alternatively, SiGe HBT technology may offer lower cost solutions for systems that can tolerate lower performance. This...Show More
A reconfigurable quarter-wave patch antenna employing a folded loading stub
2016 IEEE International Symposium on Antennas and Propagation (APSURSI)
Year: 2016 | Conference Paper |
Cited by: Papers (2)
In this paper, a concept of a compact reconfigurable quarter-wave patch antenna employing a folded loading stub and a tuning varactor is presented. The structure consists of two substrate layers separated by a ground plane. The antenna is placed on the top metal layer whilst the entire feeding structure and the bias circuit are located on the bottom layer. The central result of the paper is the fo...Show More
A polyphase RC filter implemented in ring configuration for a SiGe millimetre-wave receiver
Leigh E. Milner;James T. Harvey;Leonard T. Hall;Michael E. Parker
2016 IEEE 2nd Australian Microwave Symposium (AMS)
Year: 2016 | Conference Paper |
Cited by: Papers (8)
A broadband polyphase RC Filter is presented suitable for millimetre-wave image reject receivers. A ring layout is chosen in preference to the traditional grid layout to improve symmetry. Crossover paths are implemented in microstrip and inverted microstrip with high isolation. Electromagnetic simulation shows a gain imbalance less than 1.0 dB and phase imbalance less than 1.4° from 20 to 50 GHz.Show More
Characterisation of a transformer balun for a 7–15 GHz SiGe frequency doubler
Sudipta Chakraborty;Leigh E. Milner;Leonard T. Hall;Xi Zhu;Oya Sevimli;Michael Heimlich
2016 IEEE 2nd Australian Microwave Symposium (AMS)
Year: 2016 | Conference Paper |
Cited by: Papers (1)
A compact transformer balun with less than 0.13 dB magnitude imbalance and 0.4° phase imbalance from 7 to 15 GHz is presented. The balun is suitable for use with frequency doublers using a balanced circuit architecture. Measured data for the balun is used to predict the harmonic rejection of the frequency doubler. The fundamental rejection is 29 dB and third harmonic rejection is better than 35 dB...Show More
A biasing technique for varactor-loaded reconfigurable antennas
2016 IEEE 2nd Australian Microwave Symposium (AMS)
Year: 2016 | Conference Paper |
In this paper, variations of a simple biasing technique for varactor-loaded frequency-reconfigurable antennas are discussed. The antenna chosen for the study is, without restriction of generality, a quarter-wave microstrip patch loaded with a varactor at the radiating aperture. The technique can be generalized to other antennas in which the aperture impedance is required to be varied. The study al...Show More
A $K$ -Band Frequency Doubler With 35-dB Fundamental Rejection Based on Novel Transformer Balun in 0.13- $\mu \text{m}$ SiGe Technology
Sudipta Chakraborty;Leigh E. Milner;Xi Zhu;Leonard T. Hall;Oya Sevimli;Michael C. Heimlich
IEEE Electron Device Letters
Cited by: Papers (77)
A compact balanced frequency doubler with more than 35 dB odd-harmonic rejection and fractional bandwidth of 73% is presented in this letter. Wide bandwidth and high odd-harmonic suppression is achieved by adopting a new technique for the transformer balun design, resulting in a very low magnitude imbalance of 0.13 dB and a phase imbalance of 0.4° over 7-15 GHz. The balun performance is improved b...Show More
Pattern synthesis with angular mask for leaky-wave antennas
2016 17th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM)
Year: 2016 | Conference Paper |
Cited by: Papers (3)
Recently, a method of pattern synthesis for leaky-wave antennas (LWAs) using global optimization has been proposed by the authors. This technique utilizes a lossy transmissionline model for nonuniform continuous-source LWAs, and it was shown that taking into account reflections along the line provides a significant accuracy improvement compared to the traditional formula. In this paper, further ap...Show More
Impedance matching of a frequency- and pattern-reconfigurable antenna
2016 17th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM)
Year: 2016 | Conference Paper |
Cited by: Papers (2)
The authors have recently proposed a frequency- and pattern-reconfigurable antenna based on center-shorted patch antenna, which is tuned with six stub-loaded varactors. This antenna has the capability of switching between a broadside radiation pattern and monopole-like omni-directional pattern across a frequency tuning range of 2.7 GHz to 3.5 GHz. Using a single tuning bias voltage, the measured r...Show More
Wideband Millimeter-Wave Antennas With Magnetic-Dipole Patterns Integrated in Metallic Structures
Nghia Nguyen-Trong;Leonard Hall;Thomas Kaufmann;Christophe Fumeaux
Two realizations of millimeter-wave (mm-wave) antennas with wideband and broad beam characteristics are introduced for flush integration in metallic structures. The antenna design exploits the half-mode substrate-integrated waveguide structure and its characteristic radiation loss close to cutoff. The target bandwidth extends from 30 to 40 GHz. The proposed antennas are analyzed and optimized usin...Show More
Reconfigurable antennas based on stub-loaded substrate-integrated circuits
2016 10th European Conference on Antennas and Propagation (EuCAP)
Year: 2016 | Conference Paper |
A family of reconfigurable antennas based on stub-loaded substrate-integrated circuits, including a microstrip patch, a substrate-integrated waveguide (SIW) cavity and their variations is presented. The paper summarizes the reconfiguration concept proposed in recent papers and extend its applicability to further substrate-integrated geometries. In addition, the analysis, optimization and results o...Show More
A Frequency- and Pattern-Reconfigurable Center-Shorted Microstrip Antenna
A frequency- and pattern-reconfigurable antenna based on a center-shorted microstrip patch is presented. The novel design utilizes two resonance modes of a microstrip antenna with shorting vias at the patch center. To set up the antenna tuning mechanism, two groups of varactors with a measured tuning range of [0.149, 1.304] pF are placed at two opposite sides of the antenna, followed by open-circu...Show More
Transmission-Line Model of Nonuniform Leaky-Wave Antennas
Nonuniform leaky-wave antennas (LWAs) are analyzed and synthesized using a lossy transmission line model. The analysis is based on a general waveguide circuit theory. Compared to the classical approach, the model yields a higher accuracy in the computation of both aperture field distribution and radiation patterns. The proposed analysis is also able to provide scattering parameters of the whole st...Show More
On the tuning range of a reconfigurable half-mode substrate-integrated cavity antenna
2015 International Symposium on Antennas and Propagation (ISAP)
Year: 2015 | Conference Paper |
In this paper the theoretical maximum tuning range of a frequency-reconfigurable antenna based on a half-mode substrate-integrated cavity is investigated and discussed. The antenna, which has recently been proposed by the authors, demonstrated a measured frequency tuning range of about 42% based on the capacitance range offered by practically available varactors. In the present investigation, the ...Show More
Optimization of leaky-wave antennas based on non-uniform HMSIW
Nghia Nguyen-Trong;Thomas Kaufmann;Leonard Hall;Christophe Fumeaux
2015 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)
Year: 2015 | Conference Paper |
Cited by: Papers (12)
In this paper, the optimization of leaky-wave antennas (LWAs) based on non-uniform half-mode substrate-integrated waveguides (HMSIWs) is presented. The optimization is based on a semi-analytical solution of a tapered HMSIW, which has been recently proposed by the authors in a previously published paper. This analysis is based on a transmission line model of the HMSIW, where the reflections along t...Show More
A Frequency- and Polarization-Reconfigurable Stub-Loaded Microstrip Patch Antenna
A stub-loaded microstrip patch antenna with reconfigurability in both frequency and polarization is presented. Using 12 varactors with two independent voltages, reconfigurability is achieved in a fractional bandwidth of around 40% while allowing selection between circular polarization (CP) with both rotating senses and linear polarization (LP). The design is optimized based on an analytical model,...Show More
Analysis and Design of a Reconfigurable Antenna Based on Half-Mode Substrate-Integrated Cavity
Nghia Nguyen-Trong;Thomas Kaufmann;Leonard Hall;Christophe Fumeaux
The detailed analysis, design, and optimization of a reconfigurable antenna based on a periodically stub-loaded half-mode substrate-integrated waveguide (HMSIW) cavity is presented in this paper. The analysis demonstrates an excellent prediction of the resonance frequency for the cavity with an error of less than 2% compared to numerical simulations performed over a wide range of parameters. The f...Show More
Variational Analysis of Folded Substrate-Integrated Waveguides
Nghia Nguyen-Trong;Thomas Kaufmann;Leonard Hall;Christophe Fumeaux
An accurate numerical solution describing the propagation behavior of two types of folded substrate-integrated waveguide (FSIW) is demonstrated in this letter. The computation is based on a variational method which can be carried out efficiently by solving the stationary equation corresponding to each type of FSIW. The approach can be extended to solve various folded structures, i.e., with differe...Show More
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