JPS636999B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to coaxial connectors, and more particularly to coaxial connectors having a center conductor capture portion with electrical compensation.

Traditionally, a significant problem that has arisen in the field of coaxial connectors has been to design a satisfactory means of capturing the center conductor or contacts. It has been known to transmit axial and rotational loads directly or indirectly via a coaxial cable to cause it to be driven or displaced from a dielectric member or core. In other words, the problem is manifested by axial or rotational movement of the center conductor relative to the outer conductor or connector shell. It is well known that axial and rotational loads on the center conductor are often encountered during normal use of coaxial connectors, causing disturbances or interruptions in the potential signal. Furthermore, this problem is exacerbated whenever substantial tension is applied to the connected cables by the coaxial connector or by thermal shock that causes relative dimensional changes in the connector parts.

Other proposed solutions to this problem include the use of flanges, shoulders, barbs, and the like to cooperate with the supporting dielectric members. It has been observed that flanges or shoulders extending outwardly from the center conductor change the spacing between the outer conductor and the center conductor, creating an electrical disconnection that impairs performance. Conventionally, those skilled in the art
It has been assumed that the performance of coaxial connectors must always be adversely affected in terms of voltage standing wave ratio (VSWR) by the use of physical or mechanical retention means such as flanges, shoulders, barbs, and the like. It has been found that the flange or shoulder has excellent axial retention capability with little or no rotational retention capability.

In an attempt to overcome the problem of electrical disconnection and at the same time provide sufficient retention capacity, the center conductor, dielectric member, and outer conductor are secured against relative axial and rotational movement by epoxy pinning. This was common practice in the technical field. This was proposed as a means of holding the components in the desired relative positions of the assembly without creating significant electrical disconnections that would impair the electrical properties of the coaxial connector. The epoxy stop disclosed in, for example, US Pat. No. 3,292,117, however, has proven not to be entirely desirable, in part because it requires a fairly complex assembly process.

When using epoxy stoppers, the surfaces to be bonded must be clean and free of dirt, oil, grease, dirt, and other foreign matter to obtain a good bond and a satisfactory seal. This requires solvent cleaning by wiping with a clean, lint-free cloth or paper wipe moistened with a suitable solvent. The bonding operation must then be carried out as soon as possible after the final cleaning so that the surfaces are not contaminated for the time being. To this end, epoxies have a relatively short pot life (pot life).
life), requiring complete blending at the exact time of need. After applying the epoxy, it must be heat cured for several hours and/or room temperature cured for approximately one day.

To overcome some of the difficulties inherent in epoxy fixing, physical or mechanical retention means for the center conductor have been revisited. The design must take into account that the dielectric member is comprised of a relatively smooth, frictionless material, such as a synthetic resin polymer commonly sold under the trade name Teflon. It is well known that such materials do not adequately grip the center conductor frictionally to prevent axial and rotational movement of the center conductor relative to the remainder of the coaxial connector, especially after repeated engagement and disengagement. There is. Therefore, the design is
The possibility of center conductor movement resulting in improper mating and orientation of the components causing electrical isolation must be minimized. Consequently, any physical or mechanical retention means for the center conductor must necessarily satisfy all these conditions.

Accordingly, the present invention relates to a coaxial connector having a center conductor capture with electrical compensation. The coaxial connector includes an outer conductor and a dielectric member disposed within the outer conductor having an axial opening therethrough. A center conductor or contact is disposed within an axial opening in the dielectric member with electrical isolation from the outer conductor. Means are provided for capturing the center conductor with the aperture against axial and rotational movement. the coaxial connector presents an electrical impedance different from the electrical impedance at a location from which the capture means is spaced apart;
It further includes means adjacent said capture means for compensating said different electrical impedances presented by said capture means. Due to these constructional features, the coaxial connector of the present invention not only effectively captures the center conductor, but also effectively compensates for the different electrical impedances introduced thereby.

Other features of the invention include that the dielectric member is comprised of a deformable material that allows for radial outward expansion of the axial aperture. The center conductor preferably has a diameter that is approximately the same as the diameter of the axial aperture. The compensation means includes at least one undercut section of reduced diameter along the center conductor and the capture means includes at least one knurled retention section of increased diameter along the center conductor. In one preferred embodiment, the compensating means includes a pair of axially spaced undercut sections, and the capture means includes a single knurled retention section extending between the pair of undercut sections. In yet another preferred embodiment, the capture means includes a pair of axially spaced knurled retaining portions and the compensating means includes a single undercut portion of reduced diameter extending between the pair of knurled retaining portions. .

As is clear, the concept of the present invention is based on an outer conductor and
For use in any coaxial connector of the type comprising a deformable dielectric member having an axial hole disposed within and extending through the outer conductor and a center conductor electrically insulated from the outer conductor and disposed within the axial hole. well suited for Capturing the center conductor against axial and rotational movement within the axial bore is provided by a suitable conductor retaining section, which section is preferably generally cylindrical in shape and is arranged concentrically with respect to the center conductor. The arrangement provides an electrical impedance different from that of the spaced locations which is compensated for by adjacent means. While the conductor retaining portion provides a center conductor capture, the compensation means provides for electrical compensation of said different electrical impedances thereby provided, and the center conductor of a coaxial connector of the above-mentioned type without the problems inherent in the prior art. permitting the use of physical or mechanical retention.

As previously mentioned, the conductor retaining portion has a diameter greater than the diameter of the axial bore so as to cooperate with the dielectric member in an interference fit therewith. The compensation means may include a pair of undercut portions of reduced diameter disposed along the center conductor on each side of the conductor retaining portion. It has been found advantageous that the retaining portion has a knurled outer surface for cooperating in a gripping manner with the dielectric member. The conductor holding portion is characterized in that it presents an electrical impedance that is lower than the electrical impedance of a portion spaced therefrom. However, the compensating means provides an electrical impedance that is higher than the electrical impedance of the conductor retaining portion and higher than the electrical impedance of a location spaced therefrom, such that the conductor retaining portion and the compensating means are selected to provide matched impedances.

In another embodiment, a pair of spaced apart conductor retention portions serve to capture the center conductor against axial and rotational movement within the axial bore of the dielectric member. The conductor holding portion has a cylindrical shape and is arranged concentrically with the center conductor to provide an electrical impedance lower than that of a portion spaced apart therefrom. Adjacent thereto are means for compensating for the low electrical impedance produced by the conductor holding portion.

The conductor retaining portion has a diameter greater than the diameter of the axial bore so as to cooperate with the dielectric member in an interference fit manner. The compensation means includes a single undercut portion of reduced diameter arranged along the center conductor and extending between the conductor retaining portions. It also has a knurled outer surface for cooperating in a gripping manner with the dielectric member of the conductor holding portion. The compensating means is adapted to provide an electrical impedance higher than the electrical impedance of the conductor retaining portion and higher than the electrical impedance of a location spaced therefrom, such that the conductor retaining portion and the compensating means are selected to provide an impedance balance.

The present invention is therefore directed to a coaxial connector having a center conductor capture with electrical compensation.
It is an object of the present invention to capture the center conductor against physical or mechanical axial and rotational movement relative to the dielectric member of a coaxial connector, while impeding the connector caused by the physical or mechanical capture. The object of the present invention is to electrically compensate for the misaligned sections. Other objects and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Referring first to FIGS. 1-7, the numeral 10 generally indicates the coaxial connector of the present invention. Coaxial connector 10 includes an outer conductor 12 and a dielectric member 14 arranged within outer conductor 12 having an axial opening 16 extending therethrough. A center conductor or contact 18 is arranged in electrical isolation from the outer conductor 12 within an axial opening 16 in the dielectric member 14, with means for capturing the center conductor 18 against axial and rotational movement within the opening 16. Equipped with The coaxial connector 10 is further characterized in that the capture means 20 provides a different electrical impedance from the electrical impedance at a distance from the capture means, and the capture means 20 provides a different electrical impedance from the electrical impedance at a distance from the capture means and compensates for the different electrical impedances provided by the capture means 20. It includes adjacent means 22. With these structural features, the present invention not only effectively captures the center conductor 18, but also effectively compensates for the different electrical impedances introduced thereby.

In a preferred embodiment, dielectric member 14 is made of a deformable material to permit radial outward expansion of axial opening 16. Center conductor 18 preferably has a diameter that is approximately the same as the diameter of axial opening 16. Compensation means 2
2 includes at least one undercut portion of reduced diameter along the center conductor 18 (see FIGS. 2 and 7).

Referring to the embodiment of FIG. 1, center conductor 18 includes a pair of axially spaced, reduced diameter undercut portions 22. Referring to the embodiment of FIG. Although a single knurled retaining portion or capture means 20 extends between a pair of undercut portions 22, in other preferred embodiments a pair of knurled retaining portions 20 are provided axially spaced apart. When using this latter embodiment, a single undercut section 22 extends between a pair of knurled retaining sections 20 (see FIG. 2).

From the above explanation, the concept of the present invention is that the outer conductor 12
and a deformable dielectric member 14 having an axial hole 16 disposed within and extending through the outer conductor 12.
and the axial hole 1 is electrically insulated from the outer conductor 12.
We believe it is clear that it is well suited for use in any type of coaxial connector that includes a center conductor 18 disposed within 6. The action of trapping the central contact 18 against axial and rotational movement within the axial bore 16 is provided by a suitable conductor holding part 20, which has a cylindrical shape and which allows the central conductor 18 to be secured against axial and rotational movement.
means 2 concentrically arranged with and adjacent to the holding portion;
2 provides an electrical impedance that is different from the electrical impedance at a distance from the holding part. While the conductor retaining portion 20 provides a center conductor capture action, the compensating means 22 provides electrical compensation of the different electrical impedances resulting from the retaining portion and is suitable for coaxial connectors 10 of the type described above without the problems inherent in the prior art. center conductor 1
8 physical or mechanical retention means are permitted.

As previously mentioned, the retaining portion (capture means) 20 has a diameter greater than the diameter of the axial bore 16 so as to cooperate with the dielectric member 14 in an interference fit manner. Compensation means 2
2 may include a pair of undercut portions of reduced diameter disposed along the center conductor 18 on each side of the retaining portion 20 . Advantageously, retaining portion 20 has a knurled outer surface for cooperating with dielectric member 14 in a gripping manner. The holding portion 20 is characterized in that it provides an electrical impedance that is lower than the electrical impedance of a portion spaced apart from the holding portion. The retaining portion 20 and the compensating means 22 are selected to provide impedance matching, since the compensating means 22 provides an electrical impedance that is higher than the electrical impedance of the retaining portion 20 and higher than the electrical impedance of a location spaced from the retaining portion. Can be done.

In the embodiment shown in FIGS. 2 and 7, the coaxial connector 1
0 includes an outer conductor 12, a dielectric member 14, and a center conductor 18. Dielectric member 14 is disposed within outer conductor 12 and has an axial bore 16 therethrough. It is preferably made of a deformable material to permit radial outward expansion of the axial bore 16. A center conductor or contact 18 is disposed within the axial bore 16 in electrical isolation from the outer conductor 12. However, unlike the embodiment of FIG.
0 is provided to capture the center conductor 18 against axial and rotational movement within the axial bore 16.

As seen in FIGS. 2 and 7, the retaining portion 20 has a generally cylindrical shape and is disposed concentrically with the center conductor 18. It will be appreciated that the retaining portion 20 presents an electrical impedance that is lower than the electrical impedance at locations spaced from the retaining portion. Means 22 for compensating the low electrical impedance caused by the holding part 20 are provided adjacent to this holding part.

Other details of the embodiment of FIGS. 2 and 7 include a retaining portion 20 having a diameter greater than the diameter of the axial bore 16 for cooperating with the dielectric member 14 in an interference fit manner.
including. Compensating means 22 includes a single undercut portion of reduced diameter extending between retaining portions 20 and disposed along the center conductor. It will be appreciated that the retaining portion 20 has a knurled outer surface for cooperating with the dielectric member 14 in a gripping manner. Compensation means 22
provides an electrical impedance that is higher than the electrical impedance of the holding portion 20 and higher than the electrical impedance of a location spaced therefrom. By selecting desired design criteria, the retaining portion 20 and the compensating means 22 can be selected to provide impedance matching.

1 and 2, the deformability of dielectric member 14 is demonstrated. For example, dielectric member 14
protrudes inward at points 24 and 26 (Fig. 1),
It protrudes inward at point 28 (Figure 2). Inward protrusions 24, 26, 28 occur at corresponding undercut portions 22 of reduced diameter, where axial bore 16 attempts to return to its normal, undeformed diameter. The large diameter of each retaining part 20 is the axial hole 1
6, resulting in the creation of protrusions 24, 26, 28. The knurled outer surface of the retaining portion 20 securely holds the center conductor 18 within the axial bore 16 of the dielectric member 14 against axial and rotational movement.

If an axial load is applied to the center conductor 18 shown in FIG. 1, one of the retaining end surfaces 30 or 32 will engage the corresponding raised dielectric portion 24 or 26, thus preventing axial movement. Furthermore, the knurled surface grips the axial bore 16 of the dielectric member. Rotational loads applied to the center conductor 18 are resisted by the knurled outer surface of the retaining portion 20. Advantageously, said portions are diamond-shaped. Of course, the holding part is the dielectric member 14.
is disposed in an interference fit within the axial bore 16 of the axial bore 16, the knurled outer surface of which cooperates in a gripping manner with the surface of the dielectric member 14 defining the axial bore 16. It will be appreciated that the use of a pair of retaining portions 20 (FIG. 2) likewise provides a very effective capture of the center conductor 18. However, in this embodiment, the two conductor-retaining end faces 34, 36 of the retaining portion 20 cooperate with the dielectric member 14 to prevent axial movement.

Since the diameter of the holding portion 20 is larger than the diameter of the portion of the center conductor 18 other than the holding portion, the electrical impedance of the holding portion 20 is greater than that of the coaxial connector 10.
The characteristic electrical impedance is lower. Reduced diameter sections of center conductor 18 (as shown in FIG. 1) on either side of knurled portion 20 provide two high impedance sections. These high impedance sections substantially eliminate reflections from the low impedance sections when the diameter and length of this section are chosen to compensate for the impedance and length of the knurled portion 20. do. Electrically, this can be represented as an equivalent circuit by a "T" shaped low pass filter. The dielectric hole and capacitor C ₂ create a "T" network. Capacitor C ₁ is a discontinuous capacitance.

In practice, the diameter of the knurled retaining portion 20 is selected to provide a tight/grasp fit between the knurled retaining portion 20 and the dielectric member 14. in general,
The greater the clamping action between knurled retaining portion 20 and dielectric member 14, the greater the force required to cause axial or rotational movement of center conductor 18. but,
If the tightening action is too great, material will be removed from the surface of the dielectric member defining the axial hole 16 when the center conductor 18 is inserted. Of course, the removal of material reduces the retention of the knurled retention portion 20. Therefore, it is highly desirable that the knurled retaining portion 20 be designed to prevent this from occurring.

Referring to FIG. 2, high impedance section 22 is located between two knurled retaining portions 20 of center conductor 18. Referring to FIG. This high impedance section 22 eliminates reflections caused by the low impedance section 20 when the diameter and length of the high impedance section 22 are selected to compensate for the impedance and length of the knurled retaining section 20. do. Electrically, this can be represented as an equivalent circuit by a "Pi" type low pass filter.

Analysis has shown that the embodiments shown in FIGS. 2 and 7 generally provide lower VSWR and higher retention characteristics than the embodiment shown in FIG. VSWR curves were calculated for an uncompensated knurled retainer, a compensated high-low-high knurled retainer, a compensated low-high-low knurled retainer, and an epoxy-stopped center conductor. These calculations are 0.062 inches (approximately 1.57
Based on a minimum length for a single knurled retaining section of 0.35 inches (mm) and a minimum length for each of a pair of knurled retaining sections of 0.35 inches (approximately 8.89 mm). It has previously been determined that this is advantageous in obtaining completely acceptable axial and rotational motion capture in subminiature coaxial connectors.
VSWR was maximized by varying only the length of the high impedance section or sections 22. All of these VSWR curves are clearly shown in Figure 3. This diagram shows the concept of the present invention.
This represents what is theoretically desirable over a wide band range from 18 GHz to 18 GHz.

In developing the present invention, one design principle was to avoid the adverse effects of the aforementioned epoxy stopper.
An alternative to the epoxy fixation often used in SMA connectors was to find physical or mechanical center conductor capture means. The policy for the new method is also to provide axial and rotational movement of the center conductor that is equal to or better than the epoxy locking technique in a way that the mechanical capture means is maintained even after thermal shock or long-term exposure to high temperatures. The purpose was to provide a trapping effect. Furthermore, in addition to the mechanical capture requirements, now 1
One design strategy was to set a VSWR smaller than or equal to epoxy stop technology over a wideband range from 2 to 18 GHz.

Although the inventive concept has a wide range of applications, parameters developed for an SMA coaxial connector are described below as an example. Those skilled in the art will recognize that the inventive concepts are equally applicable and extendable to other connectors. Therefore, the parameters described below are provided as examples for the purpose of clearly expressing the concept of the present invention, and are not intended to have a limiting meaning.

It has been found that 0.050 inches for the center conductor of one SMA coaxial connector provides about 0.010 inches of tightness between the knurled retaining portion and the dielectric member. However, the larger diameter of the knurled retention portion reduces the characteristic impedance of the connector through that area by 50 to 45 ohms. For those skilled in the art, the reduction in impedance is
resulting in increased VSWR of SMA coaxial connectors,
This is illustrated graphically in Figure 3 by theoretically calculated VSWR vs. frequency for a knurled retaining section without electrical compensation.

In order to compensate for this VSWR, the high-low-high and low-high-low impedance regions were investigated theoretically and experimentally. These compensation zones can be either low impedance zones (knurled sections) separating two high impedance zones or high impedance zones (undercut sections) separating two low impedance zones.
Consisting of The high impedance zone(s) are reduced diameter sections on the center conductor that are used to substantially negate reflections from the increased diameter sections of the low impedance zone(s). As previously mentioned, the impedance range can be represented by a "T" shaped low pass filter (FIG. 1), and the low-high-low range is represented by a "Pi" shaped low pass filter.

In the high-low-high range design, the length of the knurled retaining section is set to 0.062 inches (approximately 1.57 mm),
This was done to provide the desired mechanical retention properties. The exact impedance of the knurled portion and the length of the two cut-out portions required to compensate for the impedance difference were calculated using a computer. This was done to maximize VSWR from 2 to 18 GHz by adjusting the length and impedance of the undercut, ie, high impedance. The low impedance zone has an impedance of 45 ohms, and each high impedance zone has an impedance of 0.030 inches (approx.
0.762mm) and an impedance of 55 ohms. It has been found that low VSWR can be obtained by reducing the length of the knurled retention portion, although the reduced length reduces the mechanical retention properties accordingly. A diagram of theoretically calculated VSWR versus frequency for high-low-high compensation is shown in FIG. The electrical equivalent circuit is shown in Figure 1. It should be noted that discontinuities due to steps in the center conductor are also included during the VSWR calculation.

The low-high-low design was similar to the high-low-high design. The length of the two knurled retaining parts is
The length and impedance of the undercut were calculated using a computer to provide the desired mechanical retention characteristics at 0.030 inches. These values then correspond to each 0.030 inch long knurled retaining section.
It was changed slightly by increasing it to 0.035 inches (about 0.889 mm). This slightly reduced VSWR. The lowest theoretically calculated VSWR is 45 ohms separated by a 0.047 inch long high impedance area (undercut).
A low impedance region (knurled section) of 0.035 inch (approximately 0.889 mm) length of ohm was obtained. Low-
The theoretically calculated VSWR versus frequency diagram for high-low compensation is shown in Figure 3, and the electrical equivalent circuit is shown in Figure 2.
As shown in the figure. It should be noted that discontinuities due to steps in the center conductor are included during the VSWR calculation.

An attempt was also made to analyze the impedance of the epoxy-stopped center conductor capture technique. For analysis, 2.85
The dielectric constant of This is one of the coaxial transmission lines.
This was determined by filling the section with epoxy and measuring the impedance. By knowing the inner diameter of the outer conductor and the outer diameter of the center conductor, the dielectric constant could be calculated. A plot of theoretically calculated VSWR vs. frequency for the epoxy-stopped center conductor capture technique is also shown in FIG.

A test fixture was used to test two knurled retention capture techniques: high-low-high and low-high-low. The center of the 3.5mm airline is designed to accept a short section of dielectric material containing one of the following: (1) a precision 50 ohm center conductor, (2) a 0.062 inch long (3) a center conductor with a high-low-high impedance configuration; (4) a center conductor with a low-high-low impedance configuration; and (5) an epoxy-fixed center conductor. A precision 50 ohm test section is first inserted into the aerial line and tested for the assembly.
The VSWR was measured and stored so that it could be subtracted from all future measurements. Once the precision 50 ohm test section is measured,
Once memorized, insert the remaining test sections into the aerial line and
VSWR was measured.

4-6 show that the measured VSWR generally agrees with the theoretically calculated values. Test results show that low-high-low compensation is lower than both high-low-high compensation and epoxy-stopped center conductor capture.
Indicates that VSWR occurs. Since the VSWR characteristics were within acceptable limits, the coaxial connector of the present invention was mechanically tested to determine center conductor capture retention characteristics.

To perform this mechanical test, a test fixture whose length was compatible with a standard SMA receptacle was used.
The inner dimensions of the center conductor, dielectric member, and outer conductor were the same as those of a standard SMA receptacle.
The conductors and dielectric members were assembled to worst case tolerance conditions (minimum press fit) to establish minimum axial and rotational force resistance values.

Test fixtures containing epoxy-fixed center conductors, center conductors with a single knurled retainer, and center conductors with a pair of knurled retainers were divided into groups that were exposed to various environmental conditions. Environmental conditions were ambient conditions (room temperature), thermal shock at Mil-Std.-202,
Method 107 included condition C and a temperature bake at 125° C. for 168 hours. Test data shows that physical or mechanical retention with knurled retaining sections provides greater torque resistance under all conditions, but axial force resistance is greater under ambient conditions and after thermal shock and temperature bake, the epoxy retaining center This shows that it is much smaller than the conductor trapping technique.

A comparison of electrical or mechanical test results indicates that knurling the center conductor for capture within a dielectric member is an overall improvement over epoxy-stopped center conductor capture techniques. Low-high-low compensation [0.047
Two 0.035 inch long undercuts each separated by an inch long undercut.
The knurled retention portions produce a lower VSWR than currently used epoxy-stacked center conductor capture techniques (compare Figures 5 and 6) and provide infreased retention under torque. high-low-
High compensation (one 0.062 inch long knurled retention member separated by a pair of 0.030 inch long undercut sections) can be generally comparable to epoxy-stopped center conductor capture techniques. VSWR (compare Figures 4 and 6) and provides increased holding power under torque. Both the low-high-low impedance network and the high-low-high impedance network provide completely acceptable levels of axial and rotational capture for coaxial connectors with excellent electrical operation for electrical compensation. provide.

As will be apparent to those skilled in the art, the techniques used in the above embodiments can be used to set up suitable center conductor captures with electrical compensation for a wide range of coaxial connectors. The design parameters depend in each case on the retention and compensation characteristics required for the particular connector. However, it is believed to be advantageous to first select the diameter and length of the knurled retaining portion and then the diameter and length of the undercut portion or portions such that the impedance matching can be completed.

Referring again to FIGS. 1, 2, and 7, the dielectric member 14 is
It can be seen that no means are shown for fixing the . In any practical application, dielectric member 14 needs to be captured axially and rotationally as well. Although not forming part of the inventive concept, the dielectric member may be fixedly secured by any means, including conventional means such as pinning, stud mounting, or the like.

The present invention succeeds in achieving the objective of providing a physical or mechanical retention means for capturing the center conductor of a coaxial connector. This objective is achieved by using a high impedance zone of appropriate value and location to eliminate reflections caused by the low impedance zone, which is a retentive characteristic.
The use of a knurled/clinch fit eliminates the time-consuming epoxy filling operation of the connector to provide the catch, and also eliminates the special installation of the center conductor and the lengthy curing time required for the latter. Can be done. This can be accomplished without reducing the overall efficiency of the coaxial connector in terms of electrical properties and retention characteristics. The present invention provides axial and rotational capture of a center conductor relative to the dielectric member of a coaxial connector while simultaneously achieving or exceeding the level of performance normally associated with epoxy-fixed center conductor captures. Electrically compensates for impedance mismatched sections of the connector caused by mechanical restraint.

Although the present invention has been described in detail above for purposes of illustrating embodiments, it will be apparent to those skilled in the art that various changes can be made without departing from the spirit and scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a portion of a coaxial connector utilizing a center conductor catch with electrical compensation according to the invention; FIG. 2 is a partial cross-sectional view of a coaxial connector utilizing a center conductor catch with electrical compensation according to the invention FIG. 3 is a diagram showing a theoretically calculated comparison chart of the VSWR characteristics of the embodiment of the present invention and a conventional device example, and FIG. 4 is a partial cross-sectional view of another embodiment of the present invention shown in FIG. FIG. 5 is a diagram showing a comparison chart of the calculated and measured VSWR characteristics of the embodiment of the present invention in FIG. 2;
Figure 6 shows the calculated and measured VSWR of the conventional equipment example.
FIG. 7 is a partial cross-sectional view of an exemplary coaxial connector utilizing the electrically compensated outer conductor capture portion of FIG. 2; 10...Coaxial connector, 12...Outer conductor, 1
4... Dielectric member, 16... Axial hole, 18... Center conductor or center contact, 20... Capture means or knurled retaining portion, 22... Compensation means or undercut portion, 24, 26, 28... side protrusion, 3
0,32...Conductor holding end surface.

Claims (1)

[Scope of Claims] 1. A coaxial connector in which a center conductor is disposed within an axially extending opening passing through a dielectric member disposed adjacent to an outer conductor, wherein the center conductor is axially disposed within the axially extending opening. a capturing means for capturing against directional and rotational movement; said capturing means having an electrical impedance between said capturing means and said outer conductor that is different from a characteristic electrical impedance of said center conductor and said outer conductor; compensation means for compensating for the different electrical impedances of the capture means to optimize the VSWR of the connector; the dielectric member being deformable to radially expand the axially extending opening; The capture means includes at least one retaining portion of the center conductor for radially expanding the axially extending aperture to retain the center conductor in an interference fit within the axially extending aperture. , the retaining portion of the center conductor is smaller than the characteristic electrical impedance of a portion of the center conductor other than the retaining portion between the center conductor and the outer conductor;
A coaxial connector having an electrical impedance between the center conductor and the outer conductor. 2. The holding portion of the center conductor has a substantially cylindrical shape and is located concentrically with the remainder of the center conductor;
The retaining portion of the conductor has a diameter greater than the diameter of the remainder of the center conductor and has a knurled outer surface that engages the dielectric member to prevent rotation of the conductor within the axially extending opening. A coaxial connector according to claim 1, characterized in that the coaxial connector has: 3. The compensation means includes at least one of the center conductors.
the undercut portion has a diameter smaller than the diameter of the remainder of the center conductor and an electrical impedance greater than the characteristic electrical impedance of the center conductor; A coaxial connector according to claim 1, characterized in that the coaxial connector is sized to compensate for impedance. 4. The center conductor includes a pair of undercut portions axially spaced apart along the center conductor, the retaining portion extending between the undercuts, and wherein the undercut portions 4. A coaxial connector according to claim 3, characterized in that the coaxial connector is sized to cooperatively compensate for impedance. 5. The center conductor includes a pair of the holding portions spaced apart in the axial direction along the center conductor, the undercut portion extending between the holding portions,
4. The coaxial connector of claim 3, wherein said undercut portion is sized to compensate for the low electrical impedance of said retaining portion.