31 results about "Wideband balun" patented technology

A Guanella type balun with a conductive enclosure (for example, a re-entrant box) between its coupled lines and the magnetic material enclosing its coupled lines. Some embodiments use coupled strip lines. Some embodiments have dielectric material, such as printed circuit board material inside the re-entrant box along with the coupled strip lines. Preferably, the magnetic material is ferrimagnetic. Some preferred magnetic materials are non-conductive.

A balun structure is disclosed having positive and negative going signal paths coupled to a ninety degree hybrid. The positive signal path has a circuit trace and a phase shaper structure that provides three hundred and sixty degrees of phase shift at Port 1 of the hybrid. The negative going signal path has a circuit trace and a second order phase shaper that provides four hundred and fifty degrees of phase shift at Port 2 of the hybrid. Port 1 is coupled to Port 3 of the hybrid and functions as an output port. The first order phase shaper and the second order phase shaper compensate for the signal loss caused by a signal cable coupled to the output port and provide a frequency band from DC to at least 15 GHz and a transient response having less than ten percent pre-shoot.

The invention discloses an electric bridge, which includes a non-inverting power divider and a broadband balun. The in-phase power divider is a pair of microstrip lines of equal length, and each end of the two microstrip lines is connected to form a common end for transmitting signals. The broadband balun is a pair of parallel coupled lines, one of which includes a first segment and a second segment arranged at intervals, and the first segment and the second segment are respectively connected with the other ends of the two microstrip lines to form A branch port for signal transmission; another coupling line of the broadband balun is arranged in one body and is lengthwise, capacitively coupled with the first segment and the second segment, and any end of it is a signal transmission end. Through the above method, the electric bridge of the present invention can output the in-phase signal and the anti-phase signal, realize 0° and 180° phase shift, and increase the bandwidth of the working frequency band at the same time.

The invention discloses a balun filter designed by using half-groove lines, and belongs to the technical field of basic electrical components. The balun filter includes a single-layer dielectric plate and a microstrip power divider formed by etching the upper metal layer of the single-layer dielectric plate, and the signal phase difference is 180°. The lower metal layer of the single-layer dielectric board is etched with a half-slot line structure. The half-slot line structure includes three short-circuit boundaries. The three short-circuit boundaries are two long boundaries and one short boundary respectively. The three boundaries are connected end-to-end at 90 degrees to form a continuous slot line. The three short-circuit boundaries and the boundary between the lower metal layer The metal is the floor, and the metal of the lower metal layer except the floor is the signal line. The signal line and the floor form the feeder part, and the signal line is fed through the open end of the half-slot line structure. The two long short-circuit boundaries of the slot line are respectively coupled with metal resonators of the same size, so that the inventive purpose of improving the selectivity and out-of-band suppression capability of the balun filter is achieved through a compact circuit structure.

The invention discloses a miniaturized low insertion loss broadband balun based on IPD. The unbalanced signal is fed into the first microstrip coupling line through the input port P1, and the radio frequency signal is respectively coupled to the second microstrip coupling line and the third microstrip coupling line through the first microstrip coupling line; since the signal goes from the input to the output port P2 It transmits half a wavelength more than the output port P3, and their output signals have the same amplitude and opposite phase. Therefore, the phase difference of 180° is realized between the output ports, and the unbalanced signal is converted into a balanced signal. On the basis of the traditional Marchand balun, the three-wire coupling of the invention adopts the structure of helical cross-coupling to strengthen the coupling and improve the working bandwidth of the balun. On the other hand, the miniaturization of the microstrip balun is achieved through the IPD process design, and low insertion loss and good balance of the output signal are achieved through optimization.

The invention discloses a wide-band low-profile circularly polarized antenna based on an asymmetric dipole. The antenna has a four-layer structure, and the first layer is a radiation structure printed on an upper dielectric plate with rotational symmetry, including four Asymmetrical dipoles, each dipole includes an outer long arm and an inner short arm; the second layer is an artificial magnetic conductor structure, including two square metal patches of different sizes printed on the upper layer of the medium dielectric board; the second layer The third layer is the upper floor printed on the lower dielectric board and the feed network of the lower layer, including the second-order Wilkinson power divider and 90° broadband phase shifter; the fourth layer is four broadband bars printed on the vertical dielectric board It provides a balanced feed for the radiating structure, and at the same time realizes impedance matching in a wide frequency band. This antenna has the advantages of wide frequency range, low profile, simple structure, flat gain in the band, etc. It is suitable for wireless communication fields such as electronic countermeasures, radio frequency identification systems, wireless local area networks, and global positioning systems.

The invention discloses a broadband pattern reconfigurable antenna, which comprises a substrate and a broadband coupling feed balun, two parallel and mutually spaced main radiation units of the antenna are etched on the front side of the substrate, and the back side of the substrate Etch broadband coupling feed balun; the ends of the two parallel and spaced main radiation units are each provided with a pair of "L"-shaped bent dipole radiation units; the two parallel and spaced main radiation units A pair of straight dipole units are respectively provided at the ends of the units. The broadband pattern reconfigurable antenna has the advantages of small size, light weight, simple structure, no reflector, wide bandwidth, and can realize the reconfigurable pattern of E plane and H plane at the same time, which is suitable for military and civilian radar, wireless communication, Advantages in the field of intelligent weapon guidance.