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Hi friends,
I am a graduate student working in my thesis. The topic of my thesis is
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for this information?
Please send me email.

I didn't participate in this conference, I hope next year with my
design.

BR,
Ahmed

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l         Discussion on the design of quick lock connector QMA and QN

SMA and N connectors are among the earliest invented and most widely used members of the RF coaxial connector family. The operating frequency of SMA connector is DC-18GHZ£¬VSWR¡Ü1.25 and that of N connector is DC-11GHz£¬VSWR¡Ü1.25. As for the precision type of N connector, the operating frequency is DC-18GHz£¬VSWR¡Ü1.08. Another precision horizontal surface connector based on the design of N type has an operating frequency of DC-18GHZ VSWR¡Ü1.003+0.002(f) GHZ.See Figure (1).

Making use of threaded lock, both SMA and N connectors have such disadvantages as bulky in volume, in need of tools to mate and de-mate, slow in speed, and requiring additional space in operation. To overcome these weaknesses, some SMA and N connectors, which are called QMA and QN, designed by QUICK LOCK, have been published in succession in the field. These designs make effort to save the time of mating and de-mating, to be independent of tools, to save the space and to allow a 360¡ã rotation.

In 1980s, some Chinese RF engineers had once developed a quick-insertion self-locking connector on the basis of N connector. See Figure (2).These designs though worked well, were not widely used.

QMA and QN of QQ(alias,the same below) version, invented by H company(alias,the same below), are the most widely used designs in the world now. We intend to put forward some of our opinions on the QMA and QN designs of QQ version.

l          QMA (See Figure (3))

The design of QMA in QQ version is near perfect and can reach a relatively high frequency. There are just some small problems.

1)      Presently, all the QMAs available in the market have no waterproof seal rings, which may cause the invasion of harmful gas and moisture, and in turn make the contact conductor less reliable. QQ has recently published the new waterproof QMA, which is said to be compatible with the present QMA female. It is an effective resolution, though we haven¡¯t seen the sample yet.

2)      The relatively high cost of the QMA spring lock made of beryllium copper can be explained by the following facts: the high price of beryllium copper, the difficulty in processing and the need of special treatment for environment protection.  

3)      When the QMA connector is mated, the contact effective length of the inner conductor is only 1.6mm, which is too short, while that of the SMA is 2.3mm. See Figure (3).This may reduce the contact reliability of the inner conductor after being used for several times. We believe that the contact effective length of the SMA (2.3mm) should be maintained.

The above are what we think need to be improved in the present QMA of QQ version. In fact, a new edition of QMA that will soon be published by us has already successfully solved the above problems. What¡¯s more, the cost of our spring lock is only 1/10 of theirs. With good shock resistance, our QMA can fully meet the requirement of military use.

l          QN

H company has published three versions of QN in succession. The following are our assessment:

1)      2002 version (See Figure (4))

The 2002 version first successfully gets rid of the threaded structure and makes the quick insertion and auto-locking functions possible.

Advantages:

1. It improves the mating and de-mating efficiency of the connector and realizes quick insertion and auto-locking functions without tools.

2. The reduction in size and weight (20%~40%) greatly saves the consumption of copper material (20%~50%).

3. It increases the installation density of the connector, therefore saves the installation space.

4. After being installed, the connector can make a 360¡ã rotation, which ensures a good contact.

5. The training for mating and de-mating the connector is quite simple.

Disadvantages:

1. It has a high requirement for the working accuracy of the spare parts, which completely controls the clearance between the electrical contact surfaces.

2. If there are no contact forces between the surfaces because of the clearance, the standing wave and the passive inter-modulation will be affected.  

3. Without making use of the successful resources of the mature N connector, a large amount of recalculation and checkout work is required for some QN designs that deviate from the basic parameter values of the N type.

2)      2003 version (See Figure 5)

This version makes some improvement on the basis of the 2002 version.

Features:

1.      A wave spring washer is added to the contact interface of the connector to increase the axial pressure and eliminate the clearance between the contact surfaces.

2.      The contact resistance is reduced, which is helpful to improve the passive inter-modulation.

Disadvantages:

Though the adoption of wave spring washer on the contact surface of the connector solves the problem caused by the clearance, there are only a few points on the circle surface and the impedances around them are not well matched, which may cause the reflection of electromagnetic wave on these points. This kind of connector works well in DC¡ª1.5GHZ and can also work in 1.5¡ª3G. However, if it is used in 3¡ª6GHZ, the standing wave will be high, and it will be higher in 6¡ª11GHZ. 

4)      2004 version (See Figure (6))

       Further improvements are made in this version on the basis of the 2003 version.

Features:

1.      The wave spring washer on the contact surface of the connector is replaced by the radial disk spring, which increases the axial pressure, reduces the contact resistance and improves the contact stability.

2.      By using the radial disk spring, the contact between the spring and the end surface is not just a few points, but a whole circle. This is helpful to further improve the passive inter-modulation, reduce the standing wave and the insertion loss.

Disadvantages:

1. As the contact surface of the outer conductor is sharp, a relatively big axial pressure may be generated under the influence of the radial disk spring, which may improve the contact resistance. However, as the space formed by the sharp end and the spring is in an irregular shape, a deduction with the transmission theory will show that the characteristic impedance in this part is discontinuous and may cause a relatively big reflection, especially in transmitting the high-frequency electromagnetic wave. The standing wave is quite good in DC¡ª1.5GHZ and acceptable in 1.5¡ª3GHZ. It may cause trouble on some occasion when used in 3¡ª6GHZ, and may be worse in 6¡ª11GHZ.

2. As the third design still refuses to use the basic parameters of the N type, i.e. the external diameter of the inner conductor is ¦Õ3.04 and the internal diameter of the outer conductor is ¦Õ7.00, a large amount of work in redesign and checkout is required to change the N type into the quick insertion and auto-locking type. A lot of valuable design documents on the N type accumulated in tens of years will be wasted.

On some problems of QN of the newest 2004 version, we think that the following aspects need to be improved:

1£®  The wide band width and small VSWR in the three classical radio frequency coaxial connectors, i.e. SMA, N and APC-7 precision horizontal surface connector, can be explained by the zero clearance, and therefore continuous impedance and almost no reflection between the contact surfaces. However, the application of the above spring contact in QN will surely cause the discontinuity of impedance. Therefore, we believe that the rigid contact of the N type should be maintained, so as to keep the continuous impedance between the contact surfaces and the electrical property of the QN type: DC-11GHz VSWR£¼1.25. As for the precise QN type, it can even be DC-18GHZ¡Ü1.08. Our new design is in accordance with this rule and realizes zero clearance between the contact surfaces, ensuring the continuous impedance and keeping the performance index of the N type. What's more, the material used in our connector is only 80-85% of that used in the present QQ version. We will soon publish our design. See Figure (7) 

2£®  We believe that the QN design should follow the present basic parameters of the N type, namely, the inner conductor should use ¦µ3.04 instead of ¦µ2.97, and the internal diameter of the outer conductor should be ¦µ7.00 instead of ¦µ6.85. Another suggestion is on the design of the retaining ring lock of the 1980s in China. The locking face of the retaining ring can be changed into a slope of about 10¡ã. With the mechanical auto-lock principle, the 10¡ã slope can be used to overcome the clearance problem of the contact surfaces caused by the error of processing. See Figure (8). 

James.Qu

RF Team Principal

Former Director of Product Development,Tyco-AMP Shanghai

Note:

You can read the above article online at website:www.quicklock.info . For more information please contact David Zhou via email:david@...  or info@... 

my email is lichen@...


--- In IMS2007_student_group@yahoogroups.com, "lichenpkuer"
<lichenpkuer@...> wrote:
>
> Hello Everybody,
>
> I am Chen Li (male) from Peking University, China. I am the
attendee of
> IMS and RFIC 2007. I have reserved a double room at Sheraton
Waikiki
> Hotel which costs $125 a day.
>
> In order to save money, I am looking for a roommate who can share
the
> room with me. If you are interested, please give me an email:
> lichen@..., my cell phone:13810095625
>
> Best Wishes!
>
> Sincerely yours,
> Chen Li
> May 28, 2007
>

Hello Everybody,

I am Chen Li (male) from Peking University, China. I am the attendee of
IMS and RFIC 2007. I have reserved a double room at Sheraton Waikiki
Hotel which costs $125 a day.

In order to save money, I am looking for a roommate who can share the
room with me. If you are interested, please give me an email:
lichen@..., my cell phone:13810095625

Best Wishes!

Sincerely yours,
Chen Li
May 28, 2007

Handsome and Cool Bikers looking for fun!  Chat with them here:
http://coolbiker0188.googlepages.com/bikerboyz.htm

Hello,

  I only wanted to say hello to Marjan. I have just read a paper yours
about filter optimization :). This is the first time I'm going to a
Symposium and I am very excited. This is my first year in the PhD!

See you next month! Mónica

Hi Eveybody,

There are  couple of good deals for hotel rooms at www.bookit.com
..starting from 59$ and pretty close to the conference center. So you
don't need to share room with anybody else.

MARJAN






> Is anyone here going to the IMS and is considering sharing rooms? I
> probably won't be there for the whole duration. Thinking about the 5th
> to the 7th. Maybe to the 8th. Let me know.
>
> email: pokai at stanford.edu
>
>

Is anyone here going to the IMS and is considering sharing rooms? I
probably won't be there for the whole duration. Thinking about the 5th
to the 7th. Maybe to the 8th. Let me know.

email: pokai at stanford.edu

Travel grants have already been awarded (e-mails sent out April 16).
There will be no notification sent if you were not an awardee.  Thank you.


--- In IMS2007_student_group@yahoogroups.com, "moni_phd_pdh"
<moni_phd_pdh@...> wrote:
>
> Hello.
>
> I want to ask a question here...
> Will there be any notification if I am not selected for the travel
> grant?? I'd like to know it.
> Anyone knows if it has been already decided??
>
> Thank you very much!
>

Hello Everyone,

  I'm a IEEE student member from University of Western Ontario, Canada.
I will be attending the IMS2007 conference in Honolulu and was hoping
to find anyone who is willing to share a hotel room during the
conference week. The prices posted on the website seems to be quite
costly and sharing a room for the entire week would defintely save a
lot of money which can be used for other things like site-seeing etc :-
)
  If anyone is interested please let me know, we can talk more details
then. You can reach me at agujjula@... or g_amith@....

Also, sharing any details of cheap/descent hotels in honolulu will be
highly appreciated

Amith
Phone: 5196970450.

Hello.

I want to ask a question here...
Will there be any notification if I am not selected for the travel
grant?? I'd like to know it.
Anyone knows if it has been already decided??

Thank you very much!

The maximum limit on reimbursed travel grant expenses is $1,200.  Car
rental or taxi fares are eligible for reimbursement, as our lodging
expenses.  My guess is that the first two legs of your flight
(A->Hawaii and Hawaii->B) plus other expenses would already put you
over $1,200, so there would be no need to worry about the next leg of
the flight.  If this is not the case, we would apply the remainder
toward the final leg.

--- In IMS2007_student_group@yahoogroups.com, "babmem" <babmem@...> wrote:
>
> Hello,
> May I ask several questions on travel grant here?
>
> 1.
> If I go to IMS from a city A before the conference and leave for
another
> city B after it, which parts of the flight fare are covered by this
grant?
> A->Hawaii? Hawaii->B? and B->A?
>
> In the case of not all airfares are egligible for reimburstment, if
I buy this
> 3-fold ticket, how does the grant decide the individual price of
each part?
>
> 2.
> If the itinerary is like below:
> A->Hawaii (IMS at this time) ->B->Hawaii (not for the meeting)->A
> which parts are covered?
>
> 3.
> Is the car rental or taxi fares in Honolulu egligible for reimburstment?
>
> Thank you very much
>

Hello,
May I ask several questions on travel grant here?

1.
If I go to IMS from a city A before the conference and leave for another
city B after it, which parts of the flight fare are covered by this grant?
A->Hawaii? Hawaii->B? and B->A?

In the case of not all airfares are egligible for reimburstment, if I buy this
3-fold ticket, how does the grant decide the individual price of each part?

2.
If the itinerary is like below:
A->Hawaii (IMS at this time) ->B->Hawaii (not for the meeting)->A
which parts are covered?

3.
Is the car rental or taxi fares in Honolulu egligible for reimburstment?

Thank you very much

Hello,
May I ask several questions on travel grant here?

1.
If I go to IMS from a city A before the conference and leave for another
city B after it, which parts of the flight fare are covered by this grant?
A->Hawaii? Hawaii->B? and B->A?

In the case of not all airfares are egligible for reimburstment, if I buy this
3-fold ticket, how does the grant decide the individual price of each part?

2.
If the itinerary is like below:
A->Hawaii (IMS at this time) ->B->Hawaii (not for the meeting)->A
which parts are covered?

3.
Is the car rental or taxi fares in Honolulu egligible for reimburstment?

Thank you very much

Hi,

Thanks for informing us on the travel grants. The pdf file (travel
grant application) cannot be saved with the required information.
Furthermore, the instructions clearly state that soft copies are to
be e-mailed and that hard copies will not be accepted.

If possible, can you please upload the grant application form once
more to be compatible for saving information.

thanks

Srinath

--- In
IMS2007_student_group@yahoogroups.com, "ims2007_student_group"
<ims2007_student_group@...> wrote:
>
> Hi Marjan,
>
> Yes, there will be students and early-career researcher travel
grants
> available for IMS2007.  These will cover travel expenses up to
$1,200.
>  Please check the website late this week or early next week for
more
> information.  www.ims2007.org
>

Hey all,

I'm the student volunteer coordinator for the conference, and I was
wondering if any of you would like to help out during the week of the
conference?  I've uploaded a full-fledged request form (listed in
SV_request.pdf, in the Files section).  In any case, if you're
interested, please send me an email.  akagij[at]gmail.com.  Thank you.

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the IMS2007_student_group
group.

   File        : /SV_request.pdf
   Uploaded by : justmak01 <justmak01@...>
   Description : Student Volunteer Request

You can access this file at the URL:
http://groups.yahoo.com/group/IMS2007_student_group/files/SV_request.pdf

To learn more about file sharing for your group, please visit:
http://help.yahoo.com/help/us/groups/files

Regards,

justmak01 <justmak01@...>

Hi Marjan,

Yes, there will be students and early-career researcher travel grants
available for IMS2007.  These will cover travel expenses up to $1,200.
  Please check the website late this week or early next week for more
information.  www.ims2007.org

Dear Moderator,
Hi,

I am just wondering if there is any travel grant for the students who
are going to present papers at this conference?
In addition, if you are looking for volunteers to work at coneference (
registration, etc), please let me know. I was a student volunteer at
IMS 2006 in Sanfrancisco and I am almost familiar with the stuff.

Best Regards,
MARJAN