Showing papers on "Feed line published in 1997"

Microstrip antennas on synthesized low dielectric-constant substrates

Abstract: Micromachining techniques using closely spaced holes have been used underneath a microstrip antenna on a high dielectric-constant substrate (/spl epsiv//sub r/=10.8) to synthesize a localized low dielectric-constant environment (/spl epsiv//sub r/=2.3). The measured radiation efficiency of a microstrip antenna on a micromachined 635-/spl mu/m thick /spl epsiv//sub r/=10.8 Duroid 6010 substrate increased from 48/spl plusmn/3% to 73/spl plusmn/3% at 12.8-13.0 GHz (including 3.3-cm feed line losses). We believe that this technique can be applied to millimeter-wave antennas (microstrip, dipoles, slots, etc.) on silicon and GaAs substrates to result in relatively wideband (3-6%) monolithic microwave integrated circuits (MMIC) active antenna modules for phased-arrays and collision-avoidance systems.

Planar phased array antenna assembly

Abstract: A new planar phased array antenna is disclosed having M by N antenna cells with only M+N phase shifters A grid of M+N feed lines with the M feed lines at a first frequency having a uniquely controllable phase and N feed lines at a second frequency with each feed line having a uniquely controllable phase are provided separating adjacent cells in the matrix By coupling an antenna element through a mixer to one row and column feed, a phase for each antenna element in the array can be uniquely controlled through a scan, thereby providing a simplified planar array to be implemented as a patch antenna

Coplanar waveguide-fed uniplanar bow-tie antenna

Abstract: The design of coplanar waveguide (CPW)-fed bow-tie antenna for the 2.4-GHz ISM band is described. A coplanar waveguide-to-coplanar strips (CPW-to-CPS) balun is used to obtain the balanced feed line for the printed bow-tie. An analysis method based on the mixed potential integral equation method is used to characterize the input characteristics of the bow-tie antenna. The numerical results obtained are in good agreement with the experimental data. Through experiments with bow-tie antennas of various extended angles, the bow-tie antenna with a 90/spl deg/ extended angle exhibits the widest bandwidth in the desired frequency band which has a bandwidth of 17% for a VSWR <1.5:1.

Mobile radio antenna

Abstract: A narrow and light mobile radio antenna that requires convenient supporting metal fittings provided in a base station is provided. An inner conductor (1b) of a coaxial feed line (1) extends upward by a length of 1/4 wavelength from the upper end (1c) of an outer conductor (1a). This extended inner conductor (1b) forms an antenna element (3). Outside the coaxial feed line (1), a 1/4-wavelength sleeve-like metal pipe made of brass (2) is located with one end connected to the upper end (1c) of the outer conductor (1a). On a part of the inner surface of the open end of the metal pipe (2), an internal thread (2b) is formed by tapping. In the open end of the metal pipe (2), an insulating spacer (4) having an external thread (4a) formed around its periphery is inserted. In other words, the insulating spacer (4) is located between the inner wall of the metal pipe (2) and the outer conductor (1a) of the coaxial feed line (1). At the lower end (1d) of the coaxial feed line (1), a coaxial connector (5) for connection with an external circuit is provided.

Transmission-line analysis of a capacitively coupled microstrip-ring resonator

Abstract: The resonant frequencies of a microstrip-ring resonator capacitively coupled to a feed line are accurately analyzed using a transmission-line model. By making use of ABCD- and Y-admittance matrices, a compact closed-form expression for the input impedance of the ring alone is analytically derived and shows that the ring ran be equivalently viewed as a frequency-dependent capacitor. The coupling gap is then modeled by an equivalent L-network comprising a parallel and a series gap capacitance obtained by modifying Garg and Bahl's closed-form expressions for an end-to-end microstrip gap. By simplifying the parallel and series combinations of the overall equivalent circuit, the total input impedance looking from the feed line to the gap is analytically derived to predict the resonant frequencies. To verify the analysis, the resonant frequencies of the capacitively coupled ring resonator have been accurately measured, with the experimental results showing very good agreement with the theoretical predictions.

Wide frequency band transition between via RF transmission lines and planar transmission lines

Abstract: A multi-layer circuit structure including a plurality of substrate layers. At least one planar transmission line, including microstrip, stripline, or coplanar line, disposed on the plurality of substrate layers. A via transmission line connected to that at least one planar transmission line and extending through the plurality of substrate layers. The via transmission lines having the same topology as the at least one planar transmission line for providing wide frequency band transition between the via transmission lines and the at least one planar transmission line.

Microstrip wide band antenna and radome

Abstract: A Radio Frequency (RF) microstrip antenna employs a planar or curved radiator element (302) that is mounted or supported in spaced relation to a planar or curved ground plane element (304). An RF feed is attached near one edge of the radiator element for receiving and/or transmitting RF signals in a lobe that is substantially perpendicular to the ground plane element. The radiator element and the ground plane element are maintained in a converging, inclined or tilted physical relationship. When a coaxial cable (303) is employed as the antenna feed, the cable's outer insulating is secured to the ground plane element, the cable's center conductor extends away from the ground plane element to provide signal feed to the radiator element and to provide physical support for one edge of the radiator element, and two insulator posts (325, 326) extend away from the ground plane element to provide support for the opposite edge of the radiator element. A two-piece, snap-together, radome (301) is provided, wherein a bottom half (300) nonmovably supports the feed line and ground element and adjustably supports the inclined radiating element, wherein a top half (305) snap-fits to the bottom half, and wherein the top half includes internal extending tabs that engage edge portions of the ground plane member.

Double resonant wideband patch antenna and method of forming same

Abstract: A double resonant wideband patch antenna (100) includes a planar resonator (101) forms a substantially trapezoidal shape having a non-parallel edge (103) for providing a substantially wide bandwidth. A feed line (107) extends parallel to the non-parallel edge (103) for coupling while a ground plane (111) extends beneath the planar resonator for increasing radiation efficiency.

Dual band antenna for mobile communications

Abstract: A dual band antenna for mobile communications includes a rod-shaped radiating element having a first portion of a predetermined length connected to a coaxial feed line, and a second portion of a specified length integrally extended from the first portion. The coaxial feed line connects to a ground plate, and a first capacitive load connects to the first portion of the radiating element. A choke surrounds the second portion of the radiating element, and has a shorting end connected to a distal end of the second portion and an open end at a proximal end of the second portion. A second capacitive load connects to the shorting end of the choke. In a higher operating band of the dual band, the input impedance of the choke is high, such that only the first (lower) portion of the radiating element radiates. At a lower operating band of the dual band, the choke's input impedance is lower to allow for radiation from the entire length of the antenna.

Transmitter that selectively polarizes a radio wave

Abstract: A transmitter provides a radio wave with selectable polarization. The transmitter includes antenna feeds that generate orthogonal radio waves having non-linear polarizations that corresponds to the selectable phase relationships of a first and a second modulating signals. A spacial combination of the non-linear radio waves to produce a linearly polarized radio wave that has an orientation corresponding to a selected phase relationship.

Coupling element for a radio telephone antenna

Abstract: The antenna (D) of a radio telephone radiates electromagnetic RF radiation which is directed to a dielectric body block (10) according to the invention. By means of an inner and an outer conductor (1, 2) formed on the surface of the block a signal carried by the electromagnetic radiation is coupled to a coaxial cable (12) which takes it to an external antenna.

Operation and maintenance link for antenna equipment

Abstract: An operation and maintenance communications link (40) is established between an antenna near parts component (18) and transmitter and receiver (12) of a transceiver site assembly. The transmitter and receiver are connected to a remote antenna (14) by means of a radio frequency feeder (16) supporting a plurality of communications channels. A radio transceiver (42) is connected to the antenna near parts component. A communications connection comprising the operation and maintenance communications link (40 (1)) is established between the radio frequency transceiver and the transmitter and receiver over the radio frequency feeder connected to the antenna using a selected one of the supported communications channels. Another implementation further utilizes an air interface connection (40 (2)) supporting the selected communications channel to provide the operation and maintenance communications link.

Apparatus for supplying printed products to processing stations

Abstract: A conveyor (10) has a self-contained main conveyor line (12), a number of feed lines (14, 14') in the form of buffer lines and a return line (16, 16'). Each feed line (14, 14') is associated to a processing station (26, 26'). The feed lines (14, 14') are connected to the main conveyor line (12) by means of controlled switches (28) so that, viewed in the conveyor direction (F), any of the clamps (20) can be delivered to any desired processing station (26). This gives the device great flexibility and decouples the processing stations from the pickup of the pressroom products at the pickup station (24).

Apparatus and method for transmitting electrical power and broadband RF communications signals through a dielectric

Abstract: An interface device permits installation of a video system by direction broadband RF signals from an outdoors transmission line to an indoors receiver and by providing electrical power from the receiver to the transmission line for the antenna electronics without requiring a hole for passage of a coaxial cable Power transmission circuitry includes a first inductor mounted adjacent the first side of a window and connected to the first transmission line to receive DC electrical power therefrom A square wave drive signal is applied to switch apparatus that converts the DC power received by the inductor into time-varying electrical signals that produce a time-varying magnetic field A second inductor that is part of a resonant circuit mounted adjacent the dielectric layer opposite the first inductor receives the transmitted power via magnetic induction A rectifier circuit connected between the second inductor and the second transmission line converts electrical power output therefrom into DC electrical power and supplies the DC electrical power to the second transmission line A feedback circuit maintains the frequency of the drive signal at the value for maximum power transfer The RF signal transmission circuitry includes apparatus connected to the second transmission line to receive broadband RF signals therefrom and produce a pair of differentially balanced feed signals The feed signals are capacitively coupled across window glass and fed into a coaxial cable for transmission to the receiver

A reduced branch-line coupler with eight stubs

Abstract: A branch-line coupler using eight stubs is proposed for size reduction. As for the stubs, a structure consisting of two sections of high and low impedance transmission lines is presented in order to connect a low impedance stub to a signal line. According to transmission line theory, no practical differences are found in the frequency characteristics between the normal hybrid and an experimental circuit, except for slight differences in higher frequency region over the center frequency. The experimental circuit was reduced to 25% in area, and showed good agreement with theory.

Dual band antenna

Abstract: A dual band antenna for a mobile communication system which includes: a metal tube having an open end; a coaxial feed line having inner and outer conductors, with one portion of the coaxial line inserted into the metal tube, a ground plane connected to a portion of the metal tube opposite the open end and to the outer conductor of the coaxial feed line, and, a signal line electrically coupled to the inner conductor and protruding from the metal tube at the open end thereof. Preferably, the dimensions of the metal tube, the coaxial feed line and the signal line are selected such that the antenna is impedance matched to the coaxial feed line over the dual operating band, thereby obviating the need for a separate matching network.

Digital transmission network

Abstract: A digital transmission network comprises a plurality of transmission terminals and receiving terminals, which are all connected with each other by a transmission line of a metal cable or optical fiber cable in the form of loop. Signals are transmitted by timeshare multiplexing in one direction. An individual time slot which is defined for each transmission terminal by time sharing multiplexing is allocated to each of all transmitted signals. A timing device is inserted into the loop for retransmitting a signal so that the delay time is corrected to the delay time of one frame including the delay time caused by the transmission line, cable and the like so that the consecutive frames are continuous. The transmission line is in single or dual loop. In case of the single loop, the transmission terminal includes a bypass circuit for bypassing a signal input to the transmission line if necessary. In case where the transmission line is in a dual loop comprising optical fiber cables of a working line and backup line, a control signal of loop-back is transmitted to all receiving terminals from a receiving terminal which serves as a central unit to bring all receiving terminals into a state enabling signals to be input from the optical fiber cable of the backup line. A control signal is transmitted which returns the receiving terminals into a state enabling signals to be input from the working line in order of proximity to the central unit for confirming that the receiving terminals are normally operating in order of proximity to the central unit.

Transmission line pulser discharge circuit

Abstract: An RF matching network provides matching between a charged first transmission line and a relay circuit which is switched to connect the charged transmission line to one end of a second transmission line to generate a high-voltage, high-current test pulse for a DUT connected to the other end of the second transmission line. A low pass filter section of the RF matching network suppresses transient and ringing signals which might pass through the parasitic capacitance of the relay circuit and which trigger the prematurely trigger the DUT. To remove residual charge after discharging the first transmission line, the transmission line is grounded with a GND relay before leakage tests are conducted to prevent electrically stress of destruction of leakage testing circuitry if the residual charge is not dissipated before testing for leakage. Termination resistors for the first transmission line are made of material, such as ceramic, that will not change characteristics with high current and will not breakdown in the presence of high electric fields.

Interleaved planar array antenna system providing angularly adjustable linear polarization

Abstract: An interleaved planar array antenna system providing angularly adjustable linearly polarized beams comprises an array of parallel rows of transmit dipole element pairs and an array of parallel rows of receive dipole element pairs, the two arrays being interleaved. Each of the dipole element pairs includes a first dipole element and a second dipole element adjacent and orthogonal to the first dipole element. All of the first dipole elements are parallel to each other and all of the second dipole elements are parallel to each other. All of the dipole elements are on the same surface and on another surface parallel to and spaced from the first surface there is an array of transmit feed line pairs and an array of receive feed line pairs, with the arrays being interleaved with each other. The transmit feed line pairs are proximity coupled to the transmit dipole element pairs and the receive feed line pairs are proximity coupled to the receive dipole element pairs. By controlling the relative amplitudes and phases of signals applied to the two feed lines within each feed line pair, the resultant angle of linear polarization of a composite signal from the respective dipole element pairs is adjustable.

Traffic distribution analysis in a land mobile radio system

Abstract: In a system for interconnecting a plurality of radio channel units in a single trunk group with a plurality of directional antennas and/or antenna beams, each radio channel unit has a receive section and a transmit section and the system dynamically connects the receive and transmit sections of each one of the radio channel units with any one of the plurality of antennas which, on average during a sampling period, is best suited for receiving and transmitting RF signals at the operating frequency of the radio channel unit. The system further includes traffic distribution monitor for monitoring, storing and displaying information on a periodic basis indicative of the usage of each antenna and/or antenna beam. The specific antenna or antenna beam being utilized by a radio channel unit is monitored on a periodic basis during communications between the radio channel unit and a mobile radio unit, and this information is stored in a memory associated with the radio channel unit.

Small motor with speed reducer

Abstract: PROBLEM TO BE SOLVED: To enable to easily connect feed lines to a motor by providing an electric input section with a first connecting means to mount a connecting member for a connector and a second connecting means for housing and guiding and supporting a connection part of a feed line. SOLUTION: In an electric input section 70, a hollow projecting section 76 having a bottom which forms an inner space 86 is formed as an integral part of a gear case 24 and terminals 67 at the motor side are projecting from a bottom section 77. The electric input section 70 has a first connecting means 73 and a second connecting means 75. The first connecting means 73 is used for connecting the terminals 67 at the motor side and a feed line 16a in a connector 71 and is structured so as to be mounted with an adaptor 72. The second connecting means 75 is used to connect core wires 74 of a feed line 16b to the terminals 67 at the motor side and has a projecting section 76 to store a connection of the feed line 16b in its inner space 86 and two nearly U-shaped recessed sections 84 which are formed at an upper edge of an end face 80a of a side wall 80 and which guide and support the two core wires of the feed line 16d. Because of this structure, the feed lines can be easily connected to the electric input section. COPYRIGHT: (C)1998,JPO

Compact microwave terrestrial radio utilizing monolithic microwave integrated circuits

Abstract: An integrated point-to-point microwave radio frequency unit/antenna (60) has a housing (62), a microwave antenna (68) affixed to the front face of the housing (62), and a microwave radio frequency transceiver electronics package (66) within the housing (62). The transceiver electronics package (66) includes a circuit board having transmitter and receiver intermediate frequency processors (124, 138). The transceiver electronics package (66) further includes a microwave transmitter (102) and a microwave receiver (104), each utilizing monolithic microwave integrated circuit architecture. The signals of the microwave transmitter (102) and microwave receiver (104) are preferably of different frequencies and are diplexed for communication with the antenna (68).

Manhole cover antenna equipment and communication system

Abstract: PROBLEM TO BE SOLVED: To provide a manhole cover antenna capable of providing an antenna function for a manhole cover without deteriorating cover strength only by simply machining the manhole cover SOLUTION: The surface of the manhole cover 1 is slightly cut to form a through hole 1b for putting a power feed line through in a center of the cut and recessed part 1a to install a substrate antenna 2 in the part 1a A base conductor plate 2c on the rear surface of the antenna 2 is brought into contact with the cover 1 to short-circuit Through the use of the thin substrate antenna 2 as an antenna element, the machining work of the part 1a for arranging the antenna element is minimized and as only the hole 1b for inserting a cable 2d and a connector 2e is provided, the strength of the cover 1 is not deteriorated much

Broadband non-directional tap coupler

Abstract: A non-directional tap coupler for use in high power operation over a wide bandwidth is provided. The tap coupler has an input line electrically connectable to a transmission line of a distributed transmission line system, a tap line coupled to the input line and an output line coupled to the input line. The input line, tap line and output line include sections having different characteristic impedances, with all of the different characteristic impedances falling within a practical characteristic impedance range. An electrical junction where the input line electrically joins the tap line and the output line is provided with a predetermined impedance value to ensure that the sections of the tap line and the output line all fall within the practical characteristic impedance range.

Arrangement for measuring condition of antenna in mobile telephone system

Abstract: An arrangement for measuring a condition of an antenna in a mobile telephone system has a radio equipment and a transmission line connecting the radio equipment to the antenna. The transmission line has opposite end sections, whereby one of the end sections of the transmission line is closer to the antenna than the other of the end sections of the transmission line. A masthead amplifier is at the one of the end sections of the transmission line, the masthead amplifier having first and second duplex filters, an RX branch, a TX branch and an amplifier element in the RX branch, wherein the RX branch, the TX branch and the amplifier element are between the duplex filters. The standing wave ratio is measured and a measuring value calculated therefrom within the one end section of the transmission line for measuring the condition of the antenna.

Small radio transmitter receiver system

Abstract: A small radio transmitter receiver system including a transmitter equipped with a concealed transmitting antenna and a receiver equipped with a concealed receiving antenna, the system using a 1.5V-3V battery to provide the necessary working voltage and providing at least two channels for selection, the transmitter being arranged in movable or fixed type as desired, the transmitting frequency of the transmitter being set within 35 MHz to 2.5 GHz for FM stereo or mono audio radio signal transmission as desired.

Ultra-wide bandwidth dish antenna

Abstract: An ultra-wide bandwidth dish antenna includes a plurality of transmission nes embedded in feed arms extending from an edge of a reflective dish, The first transmission line is for input and is connected in parallel to two receptive transmission lines having twice the characteristic impedance of the input transmission line, where one of the receptive transmission lines is inverted relative to the other The two receptive transmission lines are each bonded and embedded within separate feed arms of the antenna. The feed arms of the dish antenna converge to a point (apex) where the conductors of the embedded transmission lines are connected. The connection forces a signal on the exterior of the feed arms creating an electric and magnetic field enabling an electromagnetic wave to be propagated down the feed arms and launched into the reflective dish to be radiated outward.

Cylindrical edge microstrip transmission line

Abstract: A transmission line arrangement providing control of signal losses through the use of conductor cross-sectional surface area-increasing and skin effect-considered bulbous additions to the rectangular conductor cross-sectional shape frequently used in semiconductor device transmission line conductors. The achieved transmission line is especially suited for use in radio frequency integrated circuit assemblies where it also includes a backplane member, encounters signals in the microwave and millimeter wavelength range and involves conductor dimensions measured in micrometers. Control of transmission line characteristic impedance at, for example, 50 ohms is disclosed as is use of semiconductor device-compatible materials and loss comparisons data.

Antenna unit for communication system for movable body

Abstract: An antenna unit for a communication system is disclosed. The communication system includes a rail, a separable power transmission line provided along the rail, carriages running along the rail while receiving power from the power transmission line, and a fixed station for establishing communications with the carriages. Communications between the carriages and the fixed station are accomplished by transmitting a signal via the power transmission line. The antenna unit is detachably located in the path of the power transmission line. The antenna unit includes an antenna device serving as a communication antenna of the fixed station and a conductive line to which the antenna device is attached. A terminal connects each end of the conductive line to an associated separate part of the power transmission line so that the conductive line is located between the separate parts of the power transmission line, thus forming a combined power/signal transmission line. Another terminal connects the antenna device to a signal line connected to the fixed station. The antenna unit permits easy installation of an antenna without having to perform difficult winding and other steps in the field.

Apparatus for bringing pressroom products to processing stations

Abstract: A conveyor (10) has a self-contained main conveyor line (12), a number of feed lines (14, 14') in the form of buffer lines and a return line (16, 16'). Each feed line (14, 14') is associated to a processing station (26, 26'). The feed lines (14, 14') are connected to the main conveyor line (12) by means of controlled switches (28) so that, viewed in the conveyor direction (F), any of the clamps (20) can be delivered to any desired processing station (26). This gives the device great flexibility and decouples the processing stations from the pickup of the pressroom products at the pickup station (24).