A Design Of Feeding Network For A Dual-Linear Polarization, Stacked, Probe-Fed Microstrip Patch Antenna Array

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1 Downloded from orit.dtu.dk on: Fe 21, 2019 A Design Of Feeding Network For A Dul-Liner Polriztion, Stcked, Proe-Fed Microstrip Ptch Antenn Arry Jworski, G.; Krozer, Viktor Pulished in: 15th Intern. Conf. on Microwves, Rdr nd Wireless Communictions Puliction dte: 2004 Document Version Pulisher's PDF, lso known s Version of record Link ck to DTU Orit Cittion (APA): Jworski, G., & Krozer, V. (2004). A Design Of Feeding Network For A Dul-Liner Polriztion, Stcked, Proe- Fed Microstrip Ptch Antenn Arry. In 15th Intern. Conf. on Microwves, Rdr nd Wireless Communictions: Proc. 1st Europen Rdr Conference (pp ). IEEE. Generl rights Copyright nd morl rights for the pulictions mde ccessile in the pulic portl re retined y the uthors nd/or other copyright owners nd it is condition of ccessing pulictions tht users recognise nd ide y the legl requirements ssocited with these rights. Users my downlod nd print one copy of ny puliction from the pulic portl for the purpose of privte study or reserch. You my not further distriute the mteril or use it for ny profit-mking ctivity or commercil gin You my freely distriute the URL identifying the puliction in the pulic portl If you elieve tht this document reches copyright plese contct us providing detils, nd we will remove ccess to the work immeditely nd investigte your clim.

2 473 A DESIGN OF FEEDING NETWORK FOR A DUAL-LINEAR POLARIZATION, STACKED, PROBE-FED MICROSTRIP PATCH ANTENNA ARRAY Grzegorz Jworski, Viktor Krozer * Astrct: Components of multilyer feed network re presented for ppliction in rod-hnd dulliner polrized stcked C-hnd ntenn. Mesurement results of wide nd mtching circuits nd different types of power divider networks constituting prts of BFN demonstrte widehfld opertion. Suitle mtching of individulptches s well s stripline trnsitions hve een developed. Introduction Microstrip Ptch ntenns re widely used in modern communiction, rdr nd erospce systems [ll, [2]. In some systems, like synthetic perture rdr (SAR) dul frequency opertion nd dul-liner polriztion, with low cross-polriztion cpility re desired. Also dditionl requirements for low side-loes, coset' rdition pttern nd wide-nd opertion result in complex design of n ntenn em forming network (BFN) design. The feeding network hs to incorporte mtching circuits enling mtched wide nd opertion of ntenn elements together with different types of power dividerslcomhiners providing proper, usully nonuniform, power distriution to ntenn elements. To provide dul-liner polriztion cpility with low crosspolriztion coefficient good isoltion etween the individul prts of the BFN must e ssured. All these requirements suggest n ppliction of multilyer structure where different prts of BFN re plced on different lyers nd good isoltion cn e esily chieved, when stripline technology is pplied. Multilyer structure requires numer of interconnections etween lyers (vis). The possiility of excittion of leky modes tht cn significntly deteriorte properties of BFN must e tken into ccount. In this pper we present the design of such multilyer BFN for C-nd dul-liner polrized ntenn for rdr ppliction. The BFN rrngement The ntenn discussed in this pper opertes in C-nd nd is prt of the dul-frequency dul-liner polriztion ntenn rry presented erlier in [3]. The ntenn consists of 3x64 rditing elements rrnged in 8x8 element rry. Ech element is fed y two proes one for horizontl nd one for verticl polriztion. The feeding proe positions re rotted to provide low cross-polriztion nd low sidelohes y the method invented in DTU [4] nd re presented in Fig. 1. Fig. 1 The 8x8 elements ntenn rry ) positions of feeding proes for verticl nd horizontl polriztion ) single stcked microstrip ptch ntenn element A coset' pttern is demnded in elevtion plne. As result the power distriution is non-uniform nd the signl delivered to ech column of ntenn my must hve different mplitude nd phse. In Fig. 2 the rrngement for the feeding network in elevtion plne is presented together with the desired excittion coefficients. The scheme of this prt of BFN is identicl for oth horizontl nd verticl polriztion. In zimuth plne the uniform power distriution hve een chosen, however ecuse of the specil positioning of feeding proes 180 deg phse shift must e provided in the power divider network. As result in zimuth plne the feeding networks for horizontl nd for verticl polriztions hve different lyouts. This is presented in Fig. 3. G. Jworski nd V. Krozer (Electromgnetic Systems Section, EMI, 0rsted.DTU. Dnish Center for Remote Sensing, Technicl Universily of Denmrk, Kgs. Lyngy, Denmrk) E-mil: giworski@olurnet.ol, vk@,oersted.dlu.dk Authorized licensed use limited to: Dnmrks Tekniske Informtionscenter. Downloded on Ferury 10, 2010 t 09:49 from IEEE Xplore. Restrictions pply.

3 ~ Authorized licensed use limited to: Dnmrks Tekniske Informtionscenter. Downloded on Ferury 10, 2010 t 09:49 from IEEE Xplore. Restrictions pply. ~ i.ono ~ -13P.4I0-8S.lGO u9- Fig. 2 The BFN rrngement in elevtion plne i.noo f Z.41 v Fig. 3 The BFN rrngement in zimuth plne for verticl (red) nd horizontl (lue) polriztion Mtching circuits. In the dul-frequency stcked microstrip ptch ntenn configurtion mtched ndwidth of less thn 5% is chievle due to the restrictions in the sustrte thickness of the lyers nd the necessity of shring sustrtes [3]. High-resolution SAR systems demnd ntenn rrys with widend (round 8% or lrger reltive ndwidth) nd low return loss (415dB) cpilities, exceeding the opertionl ndwidth of microstrip ntenns without impednce mtching structures. To meet these requirements novel pproch for the mtching of individul ntenn elements of n ntenn rry hs een pplied [5]. The lyout of the mtching circuit nd the mesured results re presented in Fig. 4. Ld -.,: = -20 v v) i$ I o :., M.v. P2 4l 5,2 5,4 5,6 5,s Frequency [GHzl C Fig. 4 Mtching circuits for single ntenn element ) mtching circuit rrngement with two coupled lines sections ) mnufctured lyout of the ntenn ptch together with mtching circuits c) mesured retum loss versus frequency efore (x) nd fter (0) mtching Power dividerslcominers. In elevtion plne highly non-uniform power distriution is required for the reliztion of cosec rdition pttern. Consequently, the power division network consists of different types of power splitters providing vrious power division rtios. For moderte power division rtio (-8.6 db) the Gysel-type power dividers hve een pplied to overcome the prolem with very high nd very low trnsmission line chrcteristic impednces tht ppers in Wilkinson s power dividers [6]. For high power splitting two directionl couplers providing -21,6 db nd -25,4 db coupling hve een pplied. In Fig. 5 the lyout of 1 to 8 power divider is presented. To relize the uniform power distriution in zimuth plne the stndrd Wilkinson s type nd hyrid ring power divider hve een designed. The hyrid ring provide the desired I80 deg phse shitl etween djcent ntenn elements. The lyouts of power dividers for horizontl nd verticl polriztion re presented in Fig. 7 nd mesured performnce in Fig. 8.

4 ~ +: #1 #2 #3 #4 #5 #6 #7 #8 #9 Fig. 5 Lyout of the power divider network with non-uniform power distriution. 'sr, -40 5,2 5,4 5,s 5, ,4 5,6 5.8 Frequency [GHz] Frequency [GHr] Fig. 6 Mesured ) Return Loss nd h) Trnsmission Loss chrcteristics of the left prt of the power divider network with non-uniform power distriution Fig.7 The lyouts ofpower dividers providing uniform signl distriution in zimuth plne for ) horizontl nd h)verticl polriztion s-lo e. 511 _..i::ii... g I -20 s2z.;...:z= J11 -~~~~~~~-=~..",*~~~~~~~~ ,4 5.6 Frequency [GHzI 5,s 5.2 5,4 5,6 Frequency [GHz] 5.8 Fig. 8 Mesured ) Return Loss nd ) Trnsmission Loss chrcteristics of left prt of the power divider network with uniform power distriution (Fig. 7 h) Connections etween lyers Numerous vis hve to he employed in order to ssure necessly connections etween BFN prts plced on different lyers. Somc of these re uried inside the structure nd not ccessile fter mnufcturing. By propcr design of mnufcturing sequence it is possile to provide necessty ccess during the mnufcturing process. Presence of vi discontinuity in multilyered environment cretes the possiility of lunching leky modes [7]. As result significnt crosstlk to other lines nd deteriortion of vi trnsmission loss ppers. This phenomenon is not clerly visile from return loss chrcteristics. Severl techniques for suppression of those prsitic modes hve een reported [7], [SI. In the present BFN design, novel 'ype of strip-vis with dditionl Authorized licensed use limited to: Dnmrks Tekniske Informtionscenter. Downloded on Ferury 10, 2010 t 09:49 from IEEE Xplore. Restrictions pply.

5 Authorized licensed use limited to: Dnmrks Tekniske Informtionscenter. Downloded on Ferury 10, 2010 t 09:49 from IEEE Xplore. Restrictions pply. 476 grounding strips illustrted in Fig. 9 hve een pplied. This technique successfully inhiits the excittion of leky modes which leds to significnt reduction of vi trnsmission loss. prsitic ptch 0,o, I ,o 4,s 5,O 5.5 6,O Frequency [GHzl Fig. 9 The cross-section of multilyer ntenn structure. In the circle cross section of strip vi with two dditionl strips connected to ground plnes is presented ) comprison of mesured trnsmission loss for strip vi with (x) nd without (0) dditionl grounding strips Conclusion The pper presents successful rodnd design of emforming network for 8 x 8 ntenn rry t C- nd. The BFN employs novcl pproches in ntenn mtching nd stripline vi structure. The BFN is relised in multilyer strip-line technology on Rogen RT 5870 sustrte. The overll BFN prmeters re summrized in Tle I. Bndwidth (VSWE 1.5) Overll loss of BFN from input to ntenn element Return Loss t input Return loss t ntenn clement Overll rdition efficiency fc f 200 [MHz] SIM 2.5 [db] SIM VSWR5 1.5 in (5.2 t5.8) [GHz] M VSWRS 1.5 in ( )[GHz] M 47% S References: GHORBANI, K. nd WATERHOUSE, R. B.: Design of lrge rodnd ptch rrys, IEEE InterntionlSymposium Antenns nd Propgtion SocieQ 1999, vol. 2, pp , JAMES, P. nd POTTER, S.V.: A widcnd microstrip ptch rry for MicroSAR, Twelfth Intern. Con5 on Antenns ndpropgtion. ICAP 2003, pp I, 200 GRANHOLM, J.: Dul-Frequency nd Dul-Polriztion Antenns, Ph.D.Thesis, Deprtment of Electromgnetic Systems, Technicl University of Denmrk, August GRANHOLM, J. nd WOELDERS, K.: Dul polriztion stcked microstrip ptch ntenn rry with very low cross-polriztion, IEEE Trns. On Antenns ndpropgtion, vol. 49, no. 10, pp ,2001. JAWORSKI G.,KROZER V., Brodnd Mtching of Dul-Liner Polriztion Stcked Proe-Fed Microstrip Ptch Antenn, Sumitted to Electronic Letters. SAWICKI, A., SACHSE, K., JAWORSKI, G., KABACIK, P. Comprison ofplnr ntenn feed networks with Wilkinson nd coupled-line power dividers, Xll In!. Con5 on Microwves &Rdr MKON-98, Polnd, Krkow, My 20-22, 1998, vol. 2, pp ABHARI, R., ELEFTHERIADES, G.V. nd VAN DEVENTER, E.,: Equivlent circuit for multiple vis in prllel plte environment, Electronic Letters, vol. 36, No.17, PILLAI, E. R.: Cox Vi ~ A technique to Reduce Crosstlk nd Enhnce Impednce Mtch t Vis in High-Frequency Multilyer Pckges Verified y FDTD nd MOM Modeling, IEEE Trnsctions on Microwve Theory Tech., vol. 45, Oct. 1997, pp NGHIEM, D., WILLIAMS, J.T., JAKSON, D.R. nd OLINER A.: Suppression of Lekge on Stripline nd Microstrip Structures, IEEE MTT-SDigest, 1994.