Gap excitations and series loads in microstrip lines: wide band equivalent network characterization with application to THz circuits
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gap excitations THz circuits microstrip lines↗
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Advanced Microstrip Array Antenna
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microstrip array antennas circular polarization↗
On the Bandwidth of Microstrip Reflectarrays
Several factors that govern the bandwidth performance of the.
microstrip reflectarrays bandwidth antenna array m↗
Compact dual-frequency microstrip antenna feed for future soil moisture and sea surface salinity missions
The development of a compact, lightweight, dual-frequency antenna feed for future soil moisture and sea surface salinity (SSS) missions is described.
microstrip antenna soil moisture sea surface salin↗
3-Meter Ka-Band Inflatable Microstrip Reflectarray
In order to meet the increasingly stringent budget constraints for space missions, NASA is currently developing lightweight spacecrafts with reduced stowed volume but with increased capabilities.
inflatable reflectarray microstrip antenna↗
Compact, lightweight dual-frequency microstrip antenna feed for future soil moisture and sea surface salinity missions
The development of a compact, lightweight, dual-frequency antenna feed for future soil moistur and sea surface salinity missions is described.
soil moisture↗
Gap excitations and series loads in microstrip lines: equivalent network characterization with application to THz circuits
A network was derived that accurately accounts for large gap discontinuties (with respect to a wavelength) without sufering from the limitations of available numeric techniques.
microstrip↗
A Dual-Polarized Microstrip Subarray Antenna for an Inflatable L-band Synthetic Aperture Radar
Inflatable technology has been identified as a potential solution to the problem of achieving small mass, high packaging efficiency, and reliable deployment for future NASA spaceborne synthetic aperture radar (SAR) antennas.
Microstrip↗
Microstrip antennas
It is possible to design and construct simple, efficient microwave antenna, either linearly or circularly polarized, which should be useful in phased arrays. Mounted on thin dielectric substrate, it extends slightly above ground plane. Space behind ground plane is required for feed line and mounting hardware.
Howell, J. Q.↗
Development of a microstrip UHF conformal antenna
Low profile, engineering model EMU antennas were constructed. Final data for these antennas meet most of the electrical requirements in a 6 in. x 18 in. x 1.4 in. package which weighs under 2.0 lbs. Coverage data calculated at the design frequencies very nearly meets the design goal of providing a gain greater than or equal to -10 dBi over 80% of a sphere. Recommendations are made for future work directed toward producing an efficient quality design capable of operating in a space environment.
Shields, M. W.↗
Trislot-cavity microstrip antenna
Flush-mountable assembly composed of disk radiator sandwiched between planes of metal-clad dielectric board has greater bandwidths and beamwidths than simple disk antenna. Conducting planes connect so that disk is enclosed in cavity with Y-shaped slot in top plane. Cavity is excited by microwave energy from disk and radiates from trislot aperature.
Ellis, H., Jr.↗
Multiple band circularly polarized microstrip antenna
A multiple antenna assembly for communicating electromagnetic radiation is disclosed. An antenna element stack is constructed of a plurality of elliptical lamina antenna elements mutally separated by layers of dielectric material, and separated from a ground plane by dielectric material. The antenna assembly is coupled through a feed line in contact with the top antenna element. A conductor joins the remaining antenna elements to the ground plane. Each individual antenna element is operable for communication reception and transmission within a frequency band determined by the size of the particular antenna element. The sizes of the antenna elements may be selected to provide electromagnetic radiation communication over several distinct frequency bands, or to connect the individual bands into a broad band.
Yu, I. P.↗
A 4-W 56-dB gain microstrip amplifier at 15 GHz utilizing GaAs FET's and IMPATT diodes
Performance results and design considerations are presented for an all solid-state Ku-band power amplifier which is feasible for use in PM communication systems for airborne or spacecraft transmitter applications. A six-stage GaAs FET preamplifier and a driver and balanced power amplifier utilizing GaAs IMPATT diodes operating in the injection locked oscillator mode are discussed. For high power and efficiency Schottky-Read IMPATT's with low-high-low doping profiles are employed. For improved reliability the IMPATT's incorporate a TiW barrier metallization to retard degradation of the IMPATT's. Results of accelerated life testing of the IMPATT devices are also presented.
Sokolov, V.↗
Microwave conductivity of laser ablated YBaCuO superconducting films and its relation to microstrip transmission line
The discovery of high temperature superconductor oxides has raised the possibility of a new class of millimeter and microwave devices operating at temperatures considerably higher than liquid helium temperatures. Therefore, materials properties such as conductivity, current density, and sheet resistance as a function of temperature and frequency, possible anisotropies, moisture absorption, thermal expansion, and others, have to be well characterized and understood. The millimeter wave response was studied of laser ablated YBa2Cu3O(7-x)/LaAlO3 thin films as a function of temperature and frequency. In particular, the evaluation of their microwave conductivity was emphasized, since knowledge of this parameter provides a basis for the derivation of other relevant properties of these superconducting oxides, and for using them in the fabrication of actual passive circuits. The microwave conductivity for these films was measured at frequencies from 26.5 to 40.0 GHz, in the temperature range from 20 to 300 K. The values of the conductivity are obtained from the millimeter wave power transmitted through the films, using a two fluid model.
Bhasin, K. B.↗
Analysis of reactively loaded microstrip disk antenna
The moment method solution to the problem of a reactively loaded circular patch is presented. Using the reaction integral equation in conjuction with the method of moments, parameters of the Thevenin's equivalent network for the loaded patch are obtained. From the equivalent network parameters an expression for the imput impedance of the loaded patch is derived. A design procedure for a circularly polarized disk antenna is presented. Computed results are compared with the experimental data.
Deshpande, M. D.↗
Experimental study of the cross-polarization characteristics of rectangular microstrip antennas
The cross polarization characteristics of rectantular patch antennas are studied experimentally. Data are presented showing the dependence of the copolarization to cross-polarization ratio on the aspect ratio in both the E and H planes. Three substrate thicknesses are included and the variation with resonant frequency is examined.
Lee, R. Q.↗
Microstrip subarray with coplanar and stacked parasitic elements
A parasitic subarray configuration combining the coplanar and stacked geometries is proposed and studied. It is numerically shown that a two-layer cross offers a gain enhancement of several decibels compared with either the coplanar cross or the two-layer electromagnetically coupled antenna. Preliminary experimental results appear to be in agreement with this estimate.
Lee, K. F.↗