Showing papers on "Folded inverted conformal antenna published in 1992"
Patent•
29 Sep 1992TL;DR: In this article, a microstrip antenna with an integral member is proposed to establish an electrical connection between the microstrip element and a transmission line, which yields advantages in performance, reliability and manufacturing, among others.
Abstract: The present invention provides a microstrip antenna that includes a microstrip element with an integral member which is used to establish an electrical connection between the microstrip element and a transmission line. The use of the integral member to establish this electrical connection yields advantages in performance, reliability, and manufacturing, among others, that make the microstrip antenna particularly suitable for mobile applications. The present invention also provides a method of manufacturing such a microstrip antenna.
77 citations
TL;DR: In this article, the authors derive and verify the concept of antenna focusing by a planar "microstrip reflectarray" antenna, and demonstrate the feasibility of such an antenna with a measured overall antenna efficiency of approximately 48% at scan angles up to 30 degrees.
Abstract: The authors derive and verify the concept of antenna focusing by a planar 'microstrip reflectarray' antenna. Experimental results from schematically distributed patch radiators with microstrip delay lines are consistent with the simulation results. The advantages and disadvantages of such an antenna are described. The measured overall antenna efficiency is approximately 48% at scan angles up to 30 degrees . These results demonstrate the feasibility of such an antenna.<
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72 citations
18 Jun 1992
TL;DR: In this paper, the bias voltage across a varactor diode that is mounted between the conducting patch and the ground plane is controlled to tune the resonant frequency of the antenna over a 50% bandwidth.
Abstract: Experimental and theoretical results are reported for a circular microstrip patch antenna whose scattering and radiation responses are tuned by controlling the bias voltage across a varactor diode that is mounted between the conducting patch and the ground plane. This tunable microstrip patch antenna enjoys a substantially wider impedance bandwidth than the same microstrip antenna without the varactor. In addition, the scattering response of the antenna can be tuned to minimize the return at threat frequencies. By varying the diode bias from 0 to 20 V, it was possible to tune the resonant frequency of the antenna over a 50% bandwidth. >
35 citations
Patent•
17 Aug 1992
TL;DR: In this article, an inductive dielectric element was added to an inverted F-formed antenna to obtain a multi-frequency resonance characteristic and to easily manufacture the antenna of a wide band as the synthetic characteristic.
Abstract: PURPOSE:To obtain a multi-frequency resonance characteristic and to easily manufacture the antenna of a wide band as the synthetic characteristic by providing an inductive dielectric element in parallel to an inverted F-formed antenna and raising composite resonance. CONSTITUTION:The inverted F-formed antenna 1 and the inductive dielectric element 2 are formed on a circuit substrate 10 formed by polyimide as a printed wiring pattern where they are arranged in parallel. In the inverted F-formed antenna 1 and the inductive dielectric element 2, the ground ends 1G and 2G are provided on the end surface of the circuit substrate 10, and the feeding part 1F of the inverted F-formed antenna 1 is provided on the side of the circuit substrate 10. When the inverted F-formed antenna 1 and the inductive dielectric element 2 are arranged in parallel, the impedance characteristic of a stagger- form which can consider the frequencies of them as one valley when they are approximated can be obtained. When the inductive dielectric elements 2 are provided on the both sides of the inverted F-formed antenna 1, the composite resonance for the total number of the number of the antennas and the elements is generated, and the other frequency can be shared, whereby the band can be made wide.
31 citations
18 Jun 1992
TL;DR: A planar inverted F antenna (PIFA) fed by electromagnetic field coupling, which has the advantage of compactness and simplicity of feeding structure, is presented in this article, where analysis of this rather complicated antenna was successfully carried out by the FD-TD (finite-difference time-domain) method.
Abstract: A planar inverted F antenna (PIFA) fed by electromagnetic field coupling, which has the advantage of compactness and simplicity of feeding structure, is presented. Analysis of this rather complicated antenna was successfully carried out by the FD-TD (finite-difference time-domain) method. The effectiveness of this antenna was demonstrated by numerical data of input impedance and radiation pattern. >
25 citations
18 Jun 1992
TL;DR: In this article, the structure and experimental results of the see-through microstrip antenna with parallel-wire structure are described, and a simplified calculation model for the method of moments is then shown.
Abstract: The structure and experimental results of the see-through microstrip antenna with parallel-wire structure are described. A simplified calculation model for the method of moments is then shown. Finally, some calculated results are demonstrated. A parallel-wire structure instead of the mesh could be used to improve the transparency of the antenna without deteriorating the performance of the antenna. >
23 citations
TL;DR: In this paper, the characteristics of a planar inverted-F antenna on an infinite ground plane are analyzed by means of the spatial network method, and an approximate formula is investigated for the resonant frequency as a function of the width of the short-circuit plate, dimensions of the planar element and antenna height.
Abstract: By means of the spatial network method, the characteristics of a planar inverted-F antenna on an infinite ground plane are analyzed. The electric field between the planar element and ground plane and the surface current distribution on the antenna for different values of the width of the short-circuit plate are found. In addition, by Fourier transform of the impulse response of the antenna, the resonant frequency and the bandwidth are derived. The relationship between the width of the short-circuit plate and the path length of the antenna current flowing on the planar element, short-circuit plate and ground lane also is studied. An approximate formula is investigated for the resonant frequency as a function of the width of the short-circuit plate, dimensions of the planar element and antenna height. Further, by comparison with the measured results, the validity of the analysis results is confirmed.
13 citations
18 Jun 1992
TL;DR: A theoretical analysis of a microstrip antenna on a conical surface, fed by a coaxial line through the ground surface, is presented in this article, where a particular example of the microstrip patch antenna operating in its fundamental mode is examined.
Abstract: A theoretical analysis of a microstrip antenna on a conical surface, fed by a coaxial line through the ground surface, is presented. A particular example of a microstrip patch antenna operating in its fundamental mode is examined. Results on the input impedance, radiation pattern, quality factor, and efficiency are presented. >
10 citations
18 Jun 1992
TL;DR: In this article, a dual-band microstrip antenna is demonstrated, where the resonant frequencies can be varied over a wide frequency range and the input impedances are easily matched for both resonance frequencies.
Abstract: A novel dual-band microstrip antenna is demonstrated. The resonant frequencies can be varied over a wide frequency range and the input impedances are easily matched for both resonance frequencies. The radiation pattern is not affected by the modification for the dual-frequency operation. The design process is physically intuitive and relatively simple. >
7 citations
TL;DR: In this article, a coaxially fed microstrip antenna is analyzed by using the transmission line model and the excited field under the patch is Fourier decomposed into its modal components.
Abstract: A coaxially fed microstrip antenna is analysed by using the transmission line model. The excited field under the patch is Fourier decomposed into its modal components. The influence of the higher order modes on the impedance behaviour and far field patterns is shown and illustrated for a particular antenna.
6 citations
22 Mar 1992
TL;DR: The authors describe the initial RF performance of a 16 element, X-band circularly polarised (CP) microstrip patch array where a novel sequential rotation scheme is used.
01 Aug 1992
TL;DR: In this paper, the TM 01 mode of a circular resonant microstrip cavity has been used to produce an omni-directional, vertically polarized antenna with a broadside null.
Abstract: The TM 01 mode of a circular resonant microstrip cavity has been used to produce an omni-directional, vertically polarized antenna with a broadside null. Interlaced circumferential slots were added resulting in reductions in the resonant frequency of up to 50%. The performance of this antenna when mounted on the roof of an automobile has been analyzed through the application of the Geometric Theory of Diffraction (GTD).
TL;DR: In this paper, the effects of dielectric constant and thickness of substrate on the directional pattern of a circular microstrip disk antenna, excited at higher order modes, were studied theoretically using the stratified dyadic Green s function method based on reflection and transmission matrices.
Abstract: The effects of dielectric constant and thickness of substrate on the directional pattern of a circular microstrip disk antenna, excited at higher order modes, is studied theoretically using the stratified dyadic Green s function method based on reflection and transmission matrices. Substrate with dielectric constant ≈ 6 is found to give highest directional gain for 0.1 λ0 thickness value. It is suggested that the higher order modes such as TM13 mode can be effectively used in antenna arrays by a judicious choice of array synthesis.