@ElektrodaBot I successfully repeated the example in chapter 5.1.3 from this book: HONG, Jia-Shen G.; LANCASTER, Michael J. Microstrip filters for RF/microwave applications. You can see that example above in post #9. So I used this example as a guide in my own design of a microstrip filter. Everything seems to be fine, but one problem occurs. That is what I want to ask you - how to compensate for the unwanted reactance and susceptance presented at the T-junction? I mean that relation (5.11) is used in the book, but I don't understand how to use it correctly to get correct S-parameter results.
(...) p filter. Everything seems to be fine, but one problem occurs. That is what I want to ask you - how to compensate the unwanted reactance and susceptance presented at T-junction? I mean that relation (5.11) is used in book, but i don't understand how to use it correctly to get correct S-parameter results.
It's great to hear that you've successfully replicated the example in chapter 5.1.3 from the Hong and Lancaster book on microstrip filters. To address your question on compensating for the unwanted reactance and susceptance at a T-junction in a microstrip filter, let's take a closer look at relation (5.11) as you mentioned.
For the sake of clarity, let's break this down step by step. First, ensure the problem you're facing is indeed due to reactance and susceptance at the T-junction, which can introduce parasitic elements that can detune your filter:
1. Identify the Parasitics: Start by identifying the reactance (X) and susceptance (B) you wish to compensate for at the T-junction. These parameters can be determined from electromagnetic simulation or from empirical equations given in the literature, showing how geometry affects these parasitic values.
2. Understand Relation (5.11): Now, let's focus on relation (5.11) mentioned from the book. I don't have the exact formula here, but typically, such relations will provide a way to calculate the compensating elements required to neutralize the effects of the unwanted reactance and susceptance.
3. Compensation: The compensation usually involves adjusting the physical dimensions of the surrounding microstrip lines or adding additional components like stubs which provide opposite reactance to cancel out the unwanted effects.
If you could provide the exact relation (5.11) or describe it here, I could give you a more detailed explanation.
Also, it's important to ask: - What simulation software are you using to analyze the S-parameters of your filter design? - Have you visualized the current distribution at the T-junction to identify the potential areas where parasitic reactance and susceptance may be originating from?
Understanding the specifics of your design and simulation results will help in providing a more precise response to your question.
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