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The design of a wide-band circular polarization reconfigurable antenna is detailed in this paper. The design of printed antennas with single feed having reconfigurable circular polarization has been described. The designed antennas have return loss better than −10dB and axial ratio better than 3 dB for ∼20% in C-band.
This report presents the design of a dual-port dual-band annular slot antenna suitable for use in the feed-back path of an oscillator resulting in an active antenna configuration. The proposed antenna is designed to radiate and transmit equal amounts of power. The return loss of the proposed antenna is higher than that desired for one-port antenna application at the desired dual-band frequencies....
Microstrip patch antenna with circular corner truncation is proposed to achieve polarization reconfigurability. By applying forward bias, reverse bias or zero bias to the four PIN diodes, the antenna can radiate with right hand circular polarization (RHCP), left hand circular polarization (LHCP) and linear polarization (LP). Simulations as well as experimental results show that proposed antenna demonstrates...
This paper reports analysis and design of bandstop filter utilizing E-shaped dual mode resonator. The basic structure of the bandstop filter consists of E-shaped resonator parallel to microstrip transmission line and an open stub inverter. Parametric analysis is carried out using micro-stripes software and the design is optimized to get stop band with high rejection level at 6 GHz centre frequency...
This paper reports analysis and design of novel tunable bandstop filter utilizing E-shaped dual mode resonator. The basic bandstop filter using E- shaped dual mode resonator is modified to a tunable bandstop filter with two discrete frequency states of 5 and 6 GHz having same fractional bandwidth of 5%. The centre frequency control is achieved by modifying the open stub inverter length using PIN diode...
Novel microstrip antennas with reconfigurable resonant frequency capability are proposed. The antennas consist of two radiating rectangular patches, connected by thin metallic strip incorporating a PIN diode in between. By controlling the PIN diode bias voltage, the antenna can be switched between two different frequencies. Both simulation and experimental results indicate that without any additional...
In this paper, design and modeling of different types of micromachined patch antennas are described. After initial design, these antenna geometries are optimized using commercial software tools and then fabricated on high resistivity silicon wafers. To start with, a thin dielectric film of silicon nitride or silicon dioxide is deposited on silicon substrates by radio frequency (RF) sputtering. After...
This paper details the fabrication and performance of a low-k RF MEMS capacitive switch on gallium arsenide (epsivr =12.9) substrate. The switch is fabricated using GaAs MMIC compatible MEMS specific surface micromachining techniques. The switch posses a movable metallic bridge which pulls down onto a metal/dielectric sandwich to form a capacitive contact. The bridge consists of a proof mass which...
GaAs MMIC compatible process for RF MEMS Switch using 7-layered mask set has been developed. Semi- Insulating GaAs is used as substrate. E-beam evaporated 7000 A thick Ti/Pt/Au is used as bottom metal followed by 2.5 mu thick gold plating is used for CPW structure. PECVD nitride is used as field dielectric layer. Sputtered Au metal is used as a beam layer. Different sacrificial layers are tried and...
This paper presents the basic micromachined transmission line and its characteristics. Closed form expressions to generate propagation characteristics of this line are also generated. Next, methodology for the design and development of both passive and active components operating in the microwave and millimeter wave frequency region is described. The passive circuits demonstrated are the low pass...
This paper reports the design and fabrication of a membrane-supported spurline band-stop filter. The filter was fabricated using silicon bulk micromachining technique and a CMOS compatible metal/dielectric deposition RF sputtering technique. A closed-form expression of an equivalent value of dielectric constant is also derived and introduced to account for a multi-layer dielectric stack formed as...
Heat management is a key issue in packaged Microwave active devices and circuits. Estimating the amount of heat generated in the packaged device is important in order to work out a suitable scheme for thermal management. This paper presents thermal characterization of a packaged medium power amplifier (Pd~1.8 W) working in C-Band. Junction temperature of the MMICs inside the package has been estimated...
This paper reports two variants of a membrane- supported microstrip low-pass filter (LPF) fabricated using bulk micromachining technique. The two proposed LPFs exhibit low transmission loss (< 2 dB) in the entire pass-band with high out - of-band rejection characteristics. The maximum measured rejection level is better than 50 dB. One of the proposed variant has been diligently designed to deliver...
This paper reports uniplanar linearly tapered slot antennas (LTSA) with corrugated edges exhibiting wide impedance bandwidth and improved radiation patterns with experimental verification. The antenna is fed by coplanar waveguide (CPW) and the input impedance of LTSA is matched to 50 Omega CPW feed line by means of Marchand baluns. Impedance, radiation and gain characteristics of the proposed antenna...
In this paper, we report the design and fabrication of high performance Ka-band inset- fed micromachined patch antenna using post- CMOS compatible process technology. The main emphasis of this paper is to demonstrate use of RF sputtering as potential metal-dielectric films deposition-process for rapid prototyping of many antenna structures in the absence of access to a well- established MEMS foundry...
In this paper, design of a quarter wave transformer-fed circular patch antenna is presented. The maximum size of proposed antenna is 25.4 mm by 25.4 mm. The substrate material used for this antenna has thickness of substrate 0.762 mm and relative permittivity epsivr 3.2. The design frequency of the antenna is 10 GHz. By selecting optimum parameters of proposed antenna, the measured return loss of...
In this paper design and fabrication of microstrip line fed aperture coupled patch antenna is presented at 10 GHz using 0.762 mm and .508 mm thick (epsivr=3.2) substrates. The maximum size of proposed antenna is 35.4 mm by 35.4 mm. The design is optimized by means of parameter-variation studies that have been performed using a 3D electromagnetic simulator. A novel bandwidth enhancing network is described,...
In this paper, we present a novel coplanar waveguide (CPW) fed printed monopole antenna for ultra wideband communications. The antenna was fabricated on a 0.762 mm thick GML (relative permittivity of 3.2) substrate. The antenna structure was analyzed using a transmission line matrix (TLM) method based flomerics micro-stripes (version 7). The measured 10 dB return loss impedance bandwidth of the fabricated...
In this paper, different technologies currently available for building RF to millimeter wave circuits are briefly described. These include: microstrip, suspended substrate line, dielectric integrated guide and microelectromechanical system technologies. Several major projects using the aforementioned technologies have been successfully completed at the Centre for Applied Research in Electronics (CARE)...
This paper presents methodology for the design and development of passive and active micromachined antennas operating in the microwave and millimeter wave frequency region. The passive antenna design is based on dividing the circuit into bulk feed line, micromachined line to bulk feed line transition and membrane supported micromachined antenna. Each region is modeled using full wave electromagnetic...
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