Showing papers on "Feed line published in 1979"

Corner fed electric non rectangular microstrip dipole antennas

Abstract: A corner fed electric microstrip dipole antenna consisting of a thin eleccally conducting, four-sided non-rectangular shaped radiating element having two opposite sides parallel formed on one surface of a dielectric substrate, the ground plane being on the opposite surface. The feed point is located at one corner of the antenna element and the input impedance is matched with a matching microstrip transmission feed line connected to the corner of the antenna. The length of the radiating element determines the resonant frequency along the Y axis (i.e., length dimension) and the width determines the resonant frequency along the Z axis (i.e., width dimension). This antenna is capable of generating linear, elliptical and circular polarized radiation using a single element and single feed point.

Multiple omnidirectional antenna

Abstract: A multiple omnidirectional antenna, utilizing individual antennae for different frequencies, and/or different polarizations, disposed along a common axis, and employing a multiple coaxial feed from one side only, in which the omnidirectional antenna which is remote from the feed side, is in the form of an axial wave-guide section, with the portion defining the walls thereof being connected to the outer conductor of the innermost coaxial feed line, and at least, in effect, defining at least one slot therein which runs transversely to the desired polarization direction of such antenna, with the inner conductor of the innermost coaxial feed line forming the exciting element therefor and projecting into the interior of said wave-guide, and/or at least one other omnidirectional antenna in the form of a coaxial line section, the walls of which are connected to the outer conductor of another coaxial feed line, and are provided with at least one slot therein which runs transversely to the desired polarization direction of said antenna, with the inner conductor of such other coaxial line passing through the interior of said coaxial line section. Combinations of horizontal, vertical and circular polarizations may be employed.

Means for distributing electrolyte into electrolytic cells

Abstract: The present invention provides an electrolyte feed system for feeding an individual supply of electrolyte to electrolytic cells in a filter press cell circuit. The system includes a primary electrolyte feed line, having one closed end and a plurality of outlets, or orifices, therein spaced along the length of the line. The primary feed line is encased in a larger, secondary feed line. The secondary feed line has a plurality of outlets, or orifices, therein spaced along its length corresponding to the outlets in the primary feed line. In a preferred embodiment, the feed lines are circular in cross-section and are in the form of pipes or tubes. The outlets in the primary and secondary feed lines are spacedly aligned, and the outlets in the secondary feed line are communicatively connected with the electrolyte inlets in the cell compartments of the individual cells in the cell circuit. Preferably, the outlets in the secondary feed line and the inlets in the cell compartments are approximately the same size and the outlets in the primary feed line are substantially smaller. In operation, a supply of electrolyte enters the system through the primary feed line and initially fills both the primary feed line and the secondary feed line. The incoming electrolyte is jetted through the smaller outlets of the primary feed line, through the internal space between the primary and secondary feed lines, through the outlets in the secondary feed line and into the electrolyte compartments. The relatively small openings of the outlets in the primary feed line minimize the adverse effect that a drop in pressure in the electrolytic source line would have on the electrolyte level in the electrolyte in the electrolyte compartment of the cell circuit. If the outlets in the primary feed line do become clogged, the electrolyte compartments receive a supply of electrolyte from the secondary feed line.

Dipole antenna fed by coaxial active rod

Abstract: An antenna for transmission or reception of broadcast signals has a primary element and a secondary element coupled to one another capacitively and inductively. The primary element has a continuous center conductor surrounded by a concentric conductor interrupted at its midpoint to present two adjacent feed line terminals. The corresponding outer ends of the conductors are electrically joined. The secondary element is parallel to the primary element and overlaps its complete length. It is preferably tubular, to encase and seal the primary element.

Harmonic filtering device for radio transmitter

Abstract: A harmonic filtering device placed in a high frequency line connecting a radio transmitter to its load with at least one cell in parallel on the line, constituted by an anti-resonant circuit (at the transmission frequency of the transmitter) in series with a resistor, whose value is approximately 1/20th of the characteristic impedance of the line. This cell is made of a coaxial line with four conductors in which inset elements (short-circuit, capacitor, load) form the inductor and the capacitor of the anti-resonant circuit and the resistor. The resistor of this cell has no effect at the transmission frequency of the transmitter and creates insulation between the load and the transmitter for harmonic frequencies.

Electric wave lens element

Abstract: PURPOSE:To obtain a good electric wave lens element over a wide range of frequency and in an easy way, by forming the phase shifter which connects the reception antenna and the radiation antenna with the slot line or the slot line having a partial malformation. CONSTITUTION:The both ends of the slot line 3c of the phase shifter 7 are connected to the slot lines 3a and 3b which form the part of the reception antenna 5 and the radiation antenna 6. In case when the electric wave S1 having the linear polarized wave arrives, the horn 4 forming the antenna 5 receives the incident electric wave. And this received wave goes into the line 3a and then into the slot line 3c of the shifter 7. The line 3c can be cut into such a length as to cause a desired change of position, and thus the wave delay effect can be changed. Thus the electric wave coming out of the line 3c has a certain delay of phase. The electric wave coming out of the shifter 7 goes into the line 3b to be radiated into the space through the horn 4.

Turbine gland seal

Abstract: PURPOSE:To seal up a low-pressure gland by low-enthalpy bleed except in start and in stop, by connecting a low-enthalpy bleed branch line to a low-pressure gland steam feed line. CONSTITUTION:A bleed line 13 extending from low-pressure turbines 11a, 11b is connected to one end of a branch line 14 connected at the other end to a sealing steam feed line 3. A check valve 15, which permits steam to flow only to the sealing steam feed line 3, and an orifice 16 are installed in the line 13. When the pressure of the line 13 exceeds that of the line 3, steam flows into the line 3 from the line 13 through the check valve 15 and the orifice 16 and is then supplied to each gland part of the low-pressure turbines 11a, 11b through conduits 7, 8. At that time, steam leaking from a high-pressure turbine 9 and having high enthalpy is recovered to a low-pressure bleeding line from a gland steam regulator 1 through a valve 18.

Splitter/combiner network

Abstract: A dual splitter/combiner network for a single channel duplex radio transmitter/receiver has a length of transmission line 1/8 wavelength electrical length at the carrier frequency with a diode detector connected thereto at each end. A local oscillator, which is frequency modulated in the transmit mode, is connector to one end of the transmission line and an antenna to the other end. Signals from the antenna, in the receive mode, mix with the oscillator output and the difference frequency output signals at each detector will be in quadrature, suitable for subsequent processing in a direct conversion (zero I.F.) receiver circuit. In the transmit mode the frequency modulated local oscillator signal is transmitted from the antenna.

Longitudinal balance arrangements for two-to-four wire telecommunication line circuits

Abstract: A conventional interface for 2-wire telephone lines to a digital switch includes line current feed resistors and a bridge circuit where the line impedance is compared with a compromise balance network. The accuracy of the balance determines the proportion of the signal received on the receive pair being retransmitted in the transmit direction. The ratio of these signals is known as the Trans-Hybrid loss and should be as high as possible for good quality speech. In practice the telephone line impedance increases with length as also does the DC resistance of the line and thus the line current, assuming a constant voltage source. It is proposed that the line current feed resistors be formed on a common substrate using well-established film deposition techniques and the balance resistor be formed on the same substrate using a material having a negative temperature coefficient. Thus on short lines the dissipation in the line feed resistors is high, raising the temperature of the substrate, thus reducing the value of the balance resistor and hence improving the balance.

Distributor for two=phase flow such as air level mixt. - has discharge lines symmetrical to centre axis of feed line

Abstract: The device is for uniform distribution of a two-phase flow containing a liquid and a gaseous component. It is especially intended for feeding several discharge lines with a fuel-air mixture. The discharge lines (5) are symmetrical to the centre axis (8) of the feed line (4) and can be at an angle to the axis (8). Specifically, they open into the feed line at an acute angle to this centre axis. At this entry point there may be a distribution chamber (12,13), conically tapering towards the discharge lines.

Microwave measuring device

Abstract: A device for measuring the power in a microwave transmission and for providing a measuring port at the output of a microwave signal generator or transmitter. First and second quarter wavelength transmission line sections, coupled in series with one another and having characteristic impedances Z2 and Z1 respectively, where Z2 >>Z1, are coupled at the first section to a predetermined point on a transmission line to be monitored. A port at the free end of the second section allows for the connection of two independent measuring circuits to the transmission line.

Antenna feed system

Abstract: An antennae feed or take-off for a plurality of antennae where the transmission line, connecting the antennae to the termination of the line, is in a closed loop whereby signal flows either direction and transmission line phase shifts are largely compensated.

Television Receiving Antenna System Component Measurements

Abstract: Relative gain of fifteen television receiving antennas was measured as a function of frequency and azimuth angle. Input voltage standing-wave ratio was measured as a function of frequency to determine the scalar impedance properties of the antennas. These antennas, a sample of those available from sources likely to be utilized by TV antenna installation technicians as well as consumers, ranged in price from $1.00 to $78.00 and in length from 18 cm to 400 cm. Insertion loss of a sample of system components, balanced-to-unbalanced line transformers and VHF/UHF signal splitters, was measured, and transmission line attenuation was obtained from manufacturers' data. Antenna gain, component insertion loss, transmission line attenuation, and calculated dipole antenna constant are the significant components of a power budget equation relating power flow in the TV signal field incident upon the antenna to the signal power available at the receiver. Results for four simple types of home installations are given. The range of the power budget data for best and worst combinat.ions of antennas, transmission lines, and other system components illustrates the range of the power available at the receiver versus frequency for a specified power flow in the signal field.