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Aktivní anténa se zdvojovačem kmitočtu
Tomíček, Martin ; Černý, Petr (oponent) ; Raida, Zbyněk (vedoucí práce)
Tato práce je zaměřena na analýzu planární antény pracující na dvou kmitočtech s využitím zdvojovače kmitočtu. Je zde popsán návrh antény i její modelování v programu ANSOFT Designer. Je zde kladen požadavek, aby pracovní frekvence byly 900 MHz a 1,8 GHz a aby anténa pracovala s vidy TM10 a TM01.
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Microstrip Patch Antennas Fed by Substrate Integrated Waveguide
Mikulášek, Tomáš ; Polívka,, Milan (oponent) ; Vlček, Čestmír (oponent) ; Láčík, Jaroslav (vedoucí práce)
The thesis deals with the research of microstrip patch antennas and antenna arrays fed by a substrate integrated waveguide (SIW). Exploiting an SIW structure for microstrip patch antenna feeding combines the benefits of both structures. The result is a compact antenna structure retaining advantageous properties of microstrip patch antennas and having a radiation characteristic non-effected by spurious radiation which is usually produced by a conventional feeding line. The thesis consists of two factual parts. The first one (Chapter 2) deals with the design of microstrip patch antennas and exploiting a substrate integrated waveguide for their feeding. The first two microstrip patch antennas exploit an SIW and a slot or a coaxial probe in order to excite a linearly-polarized wave. SIW-based probe feeding is further utilized for exciting a single- and dual-fed circularly-polarized microstrip patch. The functionality of the proposed antenna structures is described using parametric analyses and verified by measuring of fabricated prototypes. The proposed feeding methods represent a novel feeding approach for microstrip patch antennas exploiting SIW technology. The second part of the thesis (Chapter 3) deals with implementing the linearly-polarized aperture-coupled microstrip patch antenna structure fed by SIW into two small antenna arrays consisting of 2x2 and 1x4 radiators. An amplitude distribution is considered in the case of the linear antenna array for optimum suppression of side lobes. Both proposed antenna arrays are verified by measurements. Compared to similar antenna arrays available in the literature, they reach a wider operating frequency band and a higher gain.
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Microstrip Patch Antennas Fed by Substrate Integrated Waveguide
Mikulášek, Tomáš ; Polívka,, Milan (oponent) ; Vlček, Čestmír (oponent) ; Láčík, Jaroslav (vedoucí práce)
The thesis deals with the research of microstrip patch antennas and antenna arrays fed by a substrate integrated waveguide (SIW). Exploiting an SIW structure for microstrip patch antenna feeding combines the benefits of both structures. The result is a compact antenna structure retaining advantageous properties of microstrip patch antennas and having a radiation characteristic non-effected by spurious radiation which is usually produced by a conventional feeding line. The thesis consists of two factual parts. The first one (Chapter 2) deals with the design of microstrip patch antennas and exploiting a substrate integrated waveguide for their feeding. The first two microstrip patch antennas exploit an SIW and a slot or a coaxial probe in order to excite a linearly-polarized wave. SIW-based probe feeding is further utilized for exciting a single- and dual-fed circularly-polarized microstrip patch. The functionality of the proposed antenna structures is described using parametric analyses and verified by measuring of fabricated prototypes. The proposed feeding methods represent a novel feeding approach for microstrip patch antennas exploiting SIW technology. The second part of the thesis (Chapter 3) deals with implementing the linearly-polarized aperture-coupled microstrip patch antenna structure fed by SIW into two small antenna arrays consisting of 2x2 and 1x4 radiators. An amplitude distribution is considered in the case of the linear antenna array for optimum suppression of side lobes. Both proposed antenna arrays are verified by measurements. Compared to similar antenna arrays available in the literature, they reach a wider operating frequency band and a higher gain.
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Aktivní anténa se zdvojovačem kmitočtu
Tomíček, Martin ; Černý, Petr (oponent) ; Raida, Zbyněk (vedoucí práce)
Tato práce je zaměřena na analýzu planární antény pracující na dvou kmitočtech s využitím zdvojovače kmitočtu. Je zde popsán návrh antény i její modelování v programu ANSOFT Designer. Je zde kladen požadavek, aby pracovní frekvence byly 900 MHz a 1,8 GHz a aby anténa pracovala s vidy TM10 a TM01.
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