Question for Impedance Matching for Pad, Holes and Wires

Hello,
I have a simple questions which might not be very simple. Following is a picture of a transmission line. Most books discuss the impedance mathing between the transmission line and the load. But there are solder pads, holes and short wire stubs between the load and the transmission line. Even though these things are short, but I think they will cause reflection too.

Why not most books not to consider these things. Please give me some guide.

Thanks.

There is an easy answer: For simplicity, and for better understanding of the basics without presenting multiple issues that could appear in some cases.
By the way, the parasitics of the circuit starts to be an issue only at high frequencies.

Thanks for the answer. But what if the situation is at very high frequencies. How can we consider the impedance inconsistency at the pads, holes and short stubs.

Hi,
You have to design with a proper MW SoftWare/CAD ...
K

Except for the CADs, do we have any theorectical guids for pads, etc. If so, would you recommend. Thank you.

Every technology and every design has different sizes,substrate definitions,metalic and isolation properties and so on..
That's why, you should know the technology features and layout properties of this tech.
There is no "rule of thumb" method that can be applicable to all tech. or design etc.
Every design should be considered by stand alone..

Assuming the said discontinuities are sufficient small compared to the wavelength, they can be estimated as lumped elements (capacitors and inductors) connected to the tranmission line.

Thanks to Bigboss and FvM. The modelling of discontinuities of pads, holes and short component stubs as lumped capacitors and inductors seems to be a best explanation. Do you have any references.