Project Details
Abstract
The wide-spread use of mobile phones and wireless data network, microwave circuits
fabricated on printed circuit board (PCB) are getting more and more popular. To measure the
S-parameters of the microwave circuits on PCB, vector network analyzer (VNA) are always
used. Adapters are required to connect VNAs to these PCBs. As frequency gets higher, the
adapter’s performance gets worse and affects the measurement result. To measure the real
characteristics of the circuit, TRL calibration technique is proposed. It can effectively
compute the true S-parameters of the device under test (DUT) from the measure data of the
thru, reflect and line calibration circuits. However, there is one fundamental limitation
inherent in the formulation of TRL technique. That is, the two ports must be the same.
Devices such as impedance transformers and microstrip-to-CPW transitions can never be
derived by TRL technique. To overcome this limitation, in this proposal we present a
modified TRL procedure that can measure asymmetrical 2-port devices. This technique
features the use of the original TRL technique two times on two sets of calibration kits of the
two different ports. Then, from the derived error matrices, the true S-parameters of the
asymmetrical 2-port devices can be computed. Detailed formulation of the original TRL
technique is derived. The modified TRL procedure for asymmetrical 2-port devices is
presented. Preliminary measured result of a microstrip-to-rectangular waveguide transition is
shown. Good agreement is achieved. Using the result of the TRL formulation, a TRL
procedure for 3-port device is also presented.
In the first-year project, we found the original 3-port measurement technique can only be
applied to symmetric 3-port devices. Therefore, in the second year, we propose a arbitrary
3-port measurement technique utilizing 2-port TRL calibration. Moreover, we also propose a
symmetrical 4-port measurement technique utilizing 2-port TRL calibration. Note that the
two proposed technique still are limited to reciprocal devices.
Project IDs
Project ID:PB9912-1049
External Project ID:NSC99-2221-E182-067
External Project ID:NSC99-2221-E182-067
Status | Finished |
---|---|
Effective start/end date | 01/08/10 → 31/07/11 |
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