11 results about "Ground plane" patented technology

The present invention discloses a portable personal communication device with an extendable helical antenna. This helical antenna is made of an elastic conductive spring, configured to change its height over a ground plane and along the antenna axis, mainly having two positions: a stowed position where the antenna is pressed down between the ground plane and a rigid cover, achieving a low profile; and an operational position where the rigid cover is removed and the antenna is extended by its own spring force, to a higher height, improving antenna gain. Normally, a second planar antenna may be placed over the same ground plane, not exceeding the footprint of the helical antenna, thus utilizing a compactly small volume and yet achieving a considerable electromagnetic decoupling between the antennas, due to their different radiation patterns. According to one embodiment, these antennas are installed in a Personal Locator Beacon (PLB) for Search and Rescue (SAR) of people in distress, where the planar antenna is coupled to a Global Navigation Satellite System (GNSS, such as GPS) receiver, and the helical antenna is coupled to a VHF/UHF radio.

An antenna arrangement of an electronic device and a device is disclosed. The antenna arrangement includes two radiator elements. The first radiator element of the two radiator elements is connected to a feed element. A second radiator element of the two radiator elements is a passive element and connected to a ground plane. The first radiator element is arranged to feed the second radiator element by radiating energy.

The invention discloses a measurement circuit and method for an insulation monitoring instrument fault circuit. The measurement method comprises the steps that firstly, a low-frequency square-wave pulse signal with the positive electrode and the negative electrode symmetrical is generated inside an insulation monitoring instrument; secondly, a measurement loop is formed through high negative voltage, a full ground plane and an insulation resistor Rf-dc; thirdly, a sample voltage is generated on a sampling resistor Rm through current in the measurement loop; fourthly, the sample voltage is sent to a built-in microprocessor for acquisition, and the numerical value of the insulation resistor Rf-dc can be obtained by conducting calculation according to the redundant binary algorithm. The measurement circuit and method for the insulation monitoring instrument fault circuit have the advantages the measurement precision is high, reliability is high, safety is high, and the circuit and method are suitable for different environments.

The invention discloses a common-mode noise suppression circuit adopting a complementary structure. The common-mode noise suppression circuit comprises a dielectric substrate, a differential coupling circuit, a reference grounding layer and a filter circuit, wherein the differential coupling circuit is attached to the upper surface of the dielectric substrate; the reference grounding layer and the filter circuit are attached to the lower surface of the dielectric substrate; the reference grounding layer and the filter circuit are formed by attaching a metal layer to the lower surface of the dielectric substrate and then adopting an etching process on the metal layer; the filter circuit comprises two resonator groups and two Z-shaped short-circuit branch line groups; each resonator group is composed of two complementary quarter-wavelength resonators; and each Z-shaped short-circuit branch line group is composed of two Z-shaped short-circuit branch lines. The common-mode noise suppression circuit has the advantages of being simple in structure, small in size, low in cost, wide in suppression bandwidth, deep in suppression depth and capable of guaranteeing signal integrity of differential signal transmission while achieving common-mode noise suppression.

The invention discloses a method for quickly and safely overturning a large mold, and aims to provide an overturning method which is simple to operate and quick in overturning process. According to the technical scheme, the method comprises the steps that a mathematical model of a rectangular body surrounding a module is constructed with the help of CAE software, the gravity center position of a mold is found out, a calculated gravity center point A of the mold is vertically projected to the end face of one side in the length direction of the mold, and a projection point B is obtained; Respectively calculating two translation transfer starting points C and two translation starting points D on the end surface of one side of the mold at a quarter of the width size and a half of the height size of the mold; Lifting direction, Arbitrarily doing a point E, The corner angle of the right side edge of the mold serves as a supporting point of the mold contacting the ground when the mold is overturned clockwise, a right triangle is formed by perpendicularly connecting a point E with a ground plane of a gravity center projection point B of the mold, a point F is made at will in the same sidedirection of an overturning starting point E, and the height H1 of the right angle meets the requirement that the bottom edge is larger than or equal to 100 mm and smaller than or equal to 300 mm.

The invention provides a transmission line. The transmission line comprises a first grounding layer, a second grounding layer, a signal layer which is located between the first grounding layer and thesecond grounding layer, and a base material layer which is located between the first grounding layer and the signal layer or between the signal layer and the second grounding layer. The distance between the signal layer and the first grounding layer is not equal to the distance between the signal layer and the second grounding layer.