2017 47th European Microwave Conference (EuMC), 2017
A planar implementation of groove gap waveguide is presented at Ka-band. The new structure has si... more A planar implementation of groove gap waveguide is presented at Ka-band. The new structure has similar modal characteristics to air-filled machined groove gap waveguide, but in a low-cost fabrication technology that may be readily integrated with surface mount components. The structure provides two DC isolated conducting planes while still providing a low-loss planar transmission medium. A coplanar waveguide to planar groove gap waveguide transition is designed to excite the medium. Measured results demonstrate the TE10 mode passband inside the artificially created bandgap. These de-embedded results indicate good agreement between simulated and measured results over the usable bandwidth of the waveguide (28 to 40 GHz). A cavity resonator's loss is characterised and the unloaded Q-factor of a 33.5 GHz rectangular cavity resonator is measured to be 209. This is demonstrated by measurement to be comparable to an SIW resonator on the same substrate and frequency band.
This paper presents a discussion on Passive Coherent Location (PCL) radar system using Digital-TV... more This paper presents a discussion on Passive Coherent Location (PCL) radar system using Digital-TV signals (Digital video broadcasting Terrestrial-DVB-T) as a means of radar transmission in Cape Town South Africa. It analyzes the quality of digital TV signals as an illuminator of opportunity for PCL. Digital TV signals being broadcasted in Cape Town South Africa will be analyzed by means of the ambiguity function. Furthermore, a system characterization with performance prediction.
2011 IEEE International Geoscience and Remote Sensing Symposium, 2011
Abstract This paper outlines the design of a sea clutter simulator based on the K distribution. S... more Abstract This paper outlines the design of a sea clutter simulator based on the K distribution. Sea clutter is the radar backscattered return from the sea surface. Any radar operating in maritime environment must have the ability to compensate for this clutter effect to achieve effective target detection. This is usual done by applying appropriate signal processing techniques. In order to test algorithms, modelling of clutter with appropriate distributions is the preferred technique. In this paper, a method used to generate correlated K distributed ...
Substrate integrated waveguide (SIW) technology is widely known transmission line technology adap... more Substrate integrated waveguide (SIW) technology is widely known transmission line technology adapted for use in various types of microwave circuits. This article deals with the analysis and design of a phase shifter based on the SIW technology. With simulation and measurement results obtained from the phase shifter with using air holes inside the structure, a test circuit was designed and manufactured. Results show that a phase balance of less than 10° is achieved with the experimental setup. The return loss value is better than 15 dB for working frequency band 8.85 GHz − 9GHz. The main benefit of this work is the easy of implementation air holes inside the structure and also the easy of manufacture of the circuits for antenna arrays, where a certain number of identical circuits is usually needed.
2017 IEEE Radio and Antenna Days of the Indian Ocean (RADIO), 2017
Planar groove gap waveguide (PGGWG) has similar characteristics to substrate integrated waveguide... more Planar groove gap waveguide (PGGWG) has similar characteristics to substrate integrated waveguide (SIW) in planar media, but with the advantage of DC isolated conducting planes. This work shows how this DC isolation can be exploited for device biasing by presenting an electrically tunable PGGWG resonant cavity. It is shown that varactor tuning is possible without bridging wires or concentric etched rings. A tuning range of 1.4% in a Ka-band cavity is achieved.
We present a tunable planar groove gap waveguide (PGGWG) resonant cavity at Ka-band. The cavity d... more We present a tunable planar groove gap waveguide (PGGWG) resonant cavity at Ka-band. The cavity demonstrates varactor loading and biasing without bridging wires or annular rings, as commonly is required in conventional substrate-integrated waveguide (SIW) resonant cavities. A detailed co-simulation strategy is also presented, with indicative parametric tuning data. Measured results indicate a 4.48% continuous frequency tuning range of 32.52–33.98 GHz and a Qu tuning range of 63–85, corresponding to the DC bias voltages of 0–16 V. Discrepancies between simulated and measured results are analyzed, and traced to process variation in the multi-layer printed circuit board stack, as well as unaccounted varactor parasitics and surface roughness.
2017 47th European Microwave Conference (EuMC), 2017
A planar implementation of groove gap waveguide is presented at Ka-band. The new structure has si... more A planar implementation of groove gap waveguide is presented at Ka-band. The new structure has similar modal characteristics to air-filled machined groove gap waveguide, but in a low-cost fabrication technology that may be readily integrated with surface mount components. The structure provides two DC isolated conducting planes while still providing a low-loss planar transmission medium. A coplanar waveguide to planar groove gap waveguide transition is designed to excite the medium. Measured results demonstrate the TE10 mode passband inside the artificially created bandgap. These de-embedded results indicate good agreement between simulated and measured results over the usable bandwidth of the waveguide (28 to 40 GHz). A cavity resonator's loss is characterised and the unloaded Q-factor of a 33.5 GHz rectangular cavity resonator is measured to be 209. This is demonstrated by measurement to be comparable to an SIW resonator on the same substrate and frequency band.
This paper presents a discussion on Passive Coherent Location (PCL) radar system using Digital-TV... more This paper presents a discussion on Passive Coherent Location (PCL) radar system using Digital-TV signals (Digital video broadcasting Terrestrial-DVB-T) as a means of radar transmission in Cape Town South Africa. It analyzes the quality of digital TV signals as an illuminator of opportunity for PCL. Digital TV signals being broadcasted in Cape Town South Africa will be analyzed by means of the ambiguity function. Furthermore, a system characterization with performance prediction.
2011 IEEE International Geoscience and Remote Sensing Symposium, 2011
Abstract This paper outlines the design of a sea clutter simulator based on the K distribution. S... more Abstract This paper outlines the design of a sea clutter simulator based on the K distribution. Sea clutter is the radar backscattered return from the sea surface. Any radar operating in maritime environment must have the ability to compensate for this clutter effect to achieve effective target detection. This is usual done by applying appropriate signal processing techniques. In order to test algorithms, modelling of clutter with appropriate distributions is the preferred technique. In this paper, a method used to generate correlated K distributed ...
Substrate integrated waveguide (SIW) technology is widely known transmission line technology adap... more Substrate integrated waveguide (SIW) technology is widely known transmission line technology adapted for use in various types of microwave circuits. This article deals with the analysis and design of a phase shifter based on the SIW technology. With simulation and measurement results obtained from the phase shifter with using air holes inside the structure, a test circuit was designed and manufactured. Results show that a phase balance of less than 10° is achieved with the experimental setup. The return loss value is better than 15 dB for working frequency band 8.85 GHz − 9GHz. The main benefit of this work is the easy of implementation air holes inside the structure and also the easy of manufacture of the circuits for antenna arrays, where a certain number of identical circuits is usually needed.
2017 IEEE Radio and Antenna Days of the Indian Ocean (RADIO), 2017
Planar groove gap waveguide (PGGWG) has similar characteristics to substrate integrated waveguide... more Planar groove gap waveguide (PGGWG) has similar characteristics to substrate integrated waveguide (SIW) in planar media, but with the advantage of DC isolated conducting planes. This work shows how this DC isolation can be exploited for device biasing by presenting an electrically tunable PGGWG resonant cavity. It is shown that varactor tuning is possible without bridging wires or concentric etched rings. A tuning range of 1.4% in a Ka-band cavity is achieved.
We present a tunable planar groove gap waveguide (PGGWG) resonant cavity at Ka-band. The cavity d... more We present a tunable planar groove gap waveguide (PGGWG) resonant cavity at Ka-band. The cavity demonstrates varactor loading and biasing without bridging wires or annular rings, as commonly is required in conventional substrate-integrated waveguide (SIW) resonant cavities. A detailed co-simulation strategy is also presented, with indicative parametric tuning data. Measured results indicate a 4.48% continuous frequency tuning range of 32.52–33.98 GHz and a Qu tuning range of 63–85, corresponding to the DC bias voltages of 0–16 V. Discrepancies between simulated and measured results are analyzed, and traced to process variation in the multi-layer printed circuit board stack, as well as unaccounted varactor parasitics and surface roughness.
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Papers by Titus oyedokun