A surge protector (10) comprises a surge protector having a front plate (24), a rear plate (26), and hollow cylindrical body (28) bridging the front and rear plates. A coaxial cable connector interface (14) extends from the front plate (24), and is constructed and arranged to detachably engage with a mating coaxial cable connector at the end of a first coaxial cable. A cable attachment interface (16) extends from the rear plate (26), and the cable attachment interface is constructed and arranged to attach directly to a prepared end of a second coaxial cable free of another coaxial cable connector interface. The surge protector connector (10) includes a curvilinear quarter-wavelength shorting stub (40) having a first portion extending in a generally radial direction from the inner conductor (32) through a gap in the outer conductor (38) and a second portion extending in a generally annular direction circumscribing the outer conductor (38) between the outer conductor and the cylindrical body (28).

Surge protector connector

A strip-line filter is provided with upper- and lower-stage resonators having the same electromagnetic characteristics. Each of the resonators has a one-wavelength square-shaped strip line and four open-end transmission lines connected to four coupling points A,C,B and D (or E,G,F and H) of each resonator which are spaced 90 degrees in electric length in that order. The square-shaped strip lines have a pair of parallel coupling lines closely placed in parallel to each other to electromagnetically couple the resonators. Therefore, the filter can be manufactured in a small size. A first microwave resonated in each resonator is electromagnetically influenced by two open-end transmission lines connected to two coupling points A and B (or E and F), and a second microwave resonated in each resonator is electromagnetically influenced by two open-end transmission lines connected to two coupling points C and D (or G and H). Therefore, resonance wavelengths of the microwaves can be longer than a line length of each square-shaped strip line. Also, the resonance wavelengths can be adjusted by trimming the transmission lines. Also, because all constitutional elements are made of strip lines, the filter can be made plane.

Plane type strip-line filter in which strip line is shortened and dual mode resonator in which two types microwaves are independently resonated

A strip dual mode filter consists of a strip line ring resonator (33) having an electric length equivalent to a resonance wavelength λ o for resonating microwaves at the resonance wavelength λ o according to a characteristic impedance thereof, an input coupling capacitor (34) for transmitting the microwaves from an input terminal (32) to a coupling point A of the ring resonator, an output coupling capacitor (38) for outputting the microwaves resonated in the ring resonator from a coupling point B of the ring resonator to an output terminal (38), and a phase-shifting circuit (37) connected to a coupling point C and a coupling point D of the ring resonator for changing the characteristic impedance of the ring resonator by shifting a phase of the microwave by a multiple of a half-wave length of the microwaves. The coupling point B is spaced a quarter-wave length of the microwaves apart from the coupling point A, the coupling point C is spaced the half-wave length of the microwaves apart from the coupling point A, and the coupling point D is spaced the half-wave length of the microwaves apart from the coupling point B.

Strip dual mode filter in which a resonance width of a microwave is adjusted and dual mode multistage filter in which the strip dual mode filters are arranged in series

Transmitter combining apparatus includes up to five RF filters (100) coupled to a microstrip combiner (300) for combining up to five input signals for application to a common antenna. The RF filter (100) includes a ceramic resonator (116) sandwiched between first and second compensating discs (114 and 120) and first and second shield plates (142 and 148) for temperature compensation, low loss mounting and heat sinking of the ceramic resonator (116). Good thermal contact between the ceramic resonator (116), discs (114 and 120) and shield plates (142 and 148) is produced by a compressive force exerted by springs (144-147) of shield plate (142) when the top cover (112) is attached to the aluminum housing (124). The resonant frequency of the RF filter is tuned by means of an aluminum tuning shaft (102) and ceramic tuning core (118) which are positioned by brass bushing (133) in top cover (112). Input signals are coupled to each RF filter via respective input coupling loops (122) and output signals are coupled via corresponding output coupling loops (311) to the microstrip combiner (300). The microstrip combiner (300) includes a circuit board (310) having five transmission lines (601-605) and a short-circuited tuning transmission line (610), all coupled to a junction (620). The microstrip combiner (300) is tuned by means a variable impedance produced by varying the position of a dielectric tuning plate (630) with respect to the tuning transmission line (610).

Ceramic resonator filter with electromagnetic shielding

Transmitter combining apparatus includes up to five RF filters (100) coupled to a microstrip combiner (300) for combining up to five input signals for application to a common antenna. The RF filter (100) includes a ceramic resonator (116) sandwiched between first and second compensating discs (114 and 120) and first and second shield plates (142 and 148) for temperature compensation, low loss mounting and heat sinking of the ceramic resonator (116). Good thermal contact between the ceramic resonator (116), discs (114 and 120) and shield plates (142 and 148) is produced by a compressive force exerted by springs (144-147) of shield plate (142) when the top cover (112) is attached to the aluminum housing (124). The resonant frequency of the RF filter is tuned by means of an aluminum tuning shaft (102) and ceramic tuning core (118) which are positioned by brass bushing (133) in top cover (112). Input signals are coupled to each RF filter via respective input coupling loops (122) and output signals are coupled via corresponding output coupling loops (311) to the microstrip combiner (300). The microstrip combiner (300) includes a circuit board (310) having five transmission lines (601-605) and a short-circuited tuning transmission line (610), all coupled to a junction (620). The microstrip combiner (300) is tuned by means a variable impedance produced by varying the position of a dielectric tuning plate (630) with respect to a the tuning transmission line (610).

Ceramic transmitter combiner with variable electrical length tuning stub and coupling loop interface

A bandstop filter for very high frequency transmission lines having distributed constants, having several filtering elements each intended to prevent the transmission of a specific frequency band. The first filtering element is a quarter-wave filter, the second element an assembly of two transmission paths of a length such that the signals present at the outputs have opposite phases and cancel other, the third element being a quarter-wave filter, these elements being grouped such that they form an extremely compact filter which is little sensitive to proximity effects.

Bandstop filter for very high frequency transmission lines and biassing circuit for a very high frequency transistor comprising this filter

An n-port high frequency coupler for coupling opposite strip-type ports (10a, 10c) and (20a, 20c). The coupler includes transmission line stubs (10b, 10d and 20b, 20d), each having a width less than the width of the ports and being connected at one end to the corresponding port and electrically connected at the opposite end, in a central zone (40) of the coupler to the other stubs. A resonant transmission line loop is coupled to the stubs at locations which are symmetrically-disposed with respect to the central zone. The loop has a width which is substantially equal to the width of the ports and a mean length effecting establishment of a resonant frequency just below the passband of the coupler.

N-port coupler

Microwave device comprising a conductive box containing a substrate which is spaced from one wall of the box and on its surface facing the wall is provided with a microstrip line; at least one coaxial terminal leading through another wall of the box is connected to the microstrip line, and at least one mode suppressing member is arranged symmetrically with respect to the axis of the microstrip line.

Microstrip device having mode suppressing means

Planar transducer for microwaves from a micro-strip line to a slotted line, in which a microwave strip line junction in the form of a "Y" is disposed on the upper side of a substrate, one of the strip line branches being short-circuited, the other one being open, and that a slotted line in the form of a Y, which is in the opposite direction of the first Y, is disposed at the bottom side of the substrate, one slotted line branch being open, the other being short-circuited, whereas the centers of the "Y"-structures coincide exactly.

Micro-strip to a slotted line transducer

Coupleur directionnel hyperfrequence a quatre lignes de transmission comprenant, pour la liaison des lignes de transmission (10a, 10c) et (20a, 20c), quatre troncons de ligne (10b) et (20b) perpendiculaires, de largeur inferieure a celle des lignes de transmission et relies electriquement dans leur zone centrale (40), et, superpose de facon symetrique a ces deux troncons de ligne pour realiser avec eux un couplage capacitif ou galvanique en quatre zones (11a, 21a, 11b, 21b), un anneau resonnant (30) de largeur sensiblement egale a celle des lignes de transmission et de perimetre moyen tel que la frequence de resonance soit situee juste au-dessous de la bande passante du coupleur. directional microwave four transmission lines coupler comprising, for connecting the transmission lines (10a, 10c) and (20a, 20c), four line segments (10b) and (20b) perpendicular to width smaller than that of lines transmission and electrically connected in their central zone (40), and superimposed symmetrically to the two line sections to realize with them a capacitive or galvanic coupling into four zones (11a, 21a, 11b, 21b), a resonant ring ( 30) of width substantially equal to that of the transmission lines and mean perimeter such that the resonant frequency is located just below the passband of the coupler. Application: coupleurs et circuits repartiteurs de puissance passifs. Application: splitters couplers and power circuits liabilities.

Frans Christiaan De Ronde

Papers

Bandstop filter for very high frequency transmission lines and biassing circuit for a very high frequency transistor comprising this filter

N-port coupler

Microstrip device having mode suppressing means

Micro-strip to a slotted line transducer

Microwave directional coupler with four transmission lines, and passive power distribution circuit similarly realised