Veljko Napijalo

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This paper presents details and results of the development of a low-cost, narrow-band, long range radar (LRR) front end system at 24 GHz, intended for autonomous cruise control (ACC) and other medium and long-range automotive applications. The system uses a high directivity patch array Tx/Rx antenna and a low-cost, high sensitivity RF front end. The narrow(More)
This paper presents a theoretical analysis of a 180<sup>deg</sup> hybrid coupler based on coupled lines. The analysis is applicable for the case where the non-TEM nature of coupled lines must be considered. The method used to analyze the coupler is based on an analytical <i>T</i> matrix approach, which provides suitable expressions for the design of the(More)
This paper presents a new 180deg hybrid coupler realized in multilayer LTCC technology. Proposed coupler has non-interspersed inputs/outputs, reduced size compared to conventional rat race hybrid and is robust to LTCC layer misalignment. Non-interspersed property can ease laying out complex microwave circuits compared to the use of a conventional microstrip(More)
Tbis paper presents details and results of a low-cost ultra-wideband Rr/Tx front end design at 24GHz. for short range pulse radar applications. Whilst the entire design is based on low-cost package device technologies, the performances achieved compare well with those achieved so far with the more expensive bare-die or MMIC technologies. A NF between 4 and(More)
S-parameter measurements of packaged transistors are performed in dedicated microwave test fixtures and they provide the S-parameters with respect to reference planes usually extending to the transistor capsule. Most packaged transistors have typically an extra piece/length of the metal leads extending further from those reference planes, underneath the(More)
An I/Q active mixer in LTCC technology using packaged HEMTs as mixing devices is described. A mixer is designed for use in the 24 GHz automotive radar application. An on-tile buffer amplifier was added to compensate for the limited power available from the system oscillator. Careful choice of the type or topology for each of the passive circuits implemented(More)
This paper describes the LTCC design methodology adopted by TDK. The main aim of the new method is to reduce the number of sample iterations for mobile communication front-end modules. The main elements of the method include, extracting accurate component models, incorporating into the models an automated layout generation facility and linking the layout to(More)
The design of an LTCC self-packaged amplifier for the 24 GHz ISM band using packaged transistors is described. The amplifier utilizes to a full extent the benefits of the multilayer environment as all matching networks are realized by employing multilayer impedance transformers. Advantages of using such transformers are the elimination of dedicated DC(More)
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