Design of Compact Dual-Band Microstrip Patch Antenna

In new-fangled years, with the gradation o f technology, the claim ce an antenna unhindered a1 mutibands i s increasing expeditiously. Such as GPS and K-PCS, The multi-index antennas with single sustentation pon representation the multiple resonance technolagy[l] such antennal are troublesome lo agree a amiable polarization pliancy ce GPS distinguished acceptation.
So the integrated GPSIK-PCS dual-ligament antenna using span sustentation pan has been incomplete in this paper. Referenced dual-ligament antenna using span sustentation pon has matched poiariration of integrated regularity. [2] baraccentuation it has wide extent. Incomplete antenna representations miniafurizalion technique that is to insect ilits. This technique is to acception elecVlcal manner diffusiveness by slits. [3-5] Unhindered abundance o f incomplete Bntenna is very-considerable lowered by slit. Unite outoutdirection cobble and clear accentuation cobble with foul-mouthed diu o f incomplete antenna are encircling 70% and 50% ofreferenced antenna extent.
The incomplete antenna moored of a low-profile cylindrical monopole with a extreme-loaded unite outoutdirection cobble ce K-PCS Agency, and a comer-truncated clear-accentuation microstrip cobble antenna with foul-mouthed-slits ce GPS ooeration. The incomplete antenna has the contemptible cause roll, baraccentuation i s nurture by unconjoined sustentation pon. The antenns ce GPS-index i s realized by using a corner-truncated clear-accentuation microstrip cobble with foul-mouthed slits.

The outbehalf behalf diffusiveness and close ride diffusiveness are40mm, printed on a rubrtrale o f lumpishness 1. 6mm(h) and y, referring-to peminiviry (e, :4. 4). The intermediate ofthe substrate is removed ce close athwart d i t area ( b x b ) of cobble. Recaggravate posture ce right-index roundly polarized (RHCP) brandish agency is placed parallel x-axis. and the interspace of the explore recaggravate afar fram the cobble character i s derenowned as 6 . 6 m m ( / ) . The foul-mouthed-rlitr at the comers are of correspondent diffusiveness I3. 5mm(S)and width Imm(w).
It i s renowned that the reSonant abundance expeditiously lowered with increasingdesign parameter(S). In  practice, the dazed manner running footpaths are diffusivenessened in the propo~ed designs, and the unhindered abundance is very-considerable lowered.  Also, the shorted unite outoutdirection cobble antenna with low-profile cylindrical monopole extreme is loaded at the character of clear accentuation cobble ce K-PCS agency. Ce brbadligament individuality, cylindrical monopole has a wide bisection of 6. 2mm(d,) and l e n ~ h 10. 7mm(h2). The eander outoutdirection cobble has a ride lengh Z l m m ( p ) and is conjoined to the contemptible cause by span identical shorting posh, which feel a bisection of 2. 2mm(d2). By varying ofthe shorting ports bisection(d2), amiable impedance matching can easily be obtained. Unite outoutdirection cobble extent can be subsided by increasing inserted slit diffusiveness. Becarepresentation of the antenna ce K-PCS agency quarrel the axial mtio of GPS receiving antenna, the miniatufimion of GPS antenna is scant.
According to the trial, the cobble extent of GPS antenna ce round polarized agency must he aggravate encircling twice the extent of KPCS antenna with unite outoutdirection suunurc. In the incomplete designs, the ligamentwidth of3-dB axial mtio is encircling 13 MHz, which is considerable wider than that required ce GPS agency at 1575 MHz.
The self-containedness betwixt the span sustentation pons of the PCS and GPS elemenls is close than -17dB. Measured radiation panems of the incomplete antenna at l8OOMHz and ISROMHz are presented in Figure 5 and 6, respectively. The K-PCS antenna radiation panem at IROOMHz shows a monopole radiation panem, 10 this fype of antenna is eligible ce applications on a vehicular descobble regularity. Ce the GPS anfenna at ISROMHz, amiable broadbehalf ligament radiation panem is obtained. Far K-PCS agency the measured pea antenna establishs is encircling 2. 4dBi and t h c establish variations are among O. JdBi, ce GPS agency the measured peak antenna establishs is encircling 7. dBi and the vanations of establish does not attributable attributable attributable insist.
Conclusion
Incomplete antenna has a integrated slmcturc of microitrip cobble antenna with span recovers ce dual-ligament oprmtion(GPSiK-PCS). A low-profile cylindrical monopole with a shorted unite outoutdirection cobble i s loaded ce K-PCS agency, which rhowr a outlinearly polarized monopole patkm with broadligament characterirlic. The radiating benignant ce GPS agency is a newlight clear-accentuation microstip footfootpath with truncated comers with foul-mouthed slits, which agree roundly polarized braadrids radiation panemr. extent contraction of incomplete antenna is achieved by using slits.
Unite outoutdirection cobble and clear accentuation cobble with foul-mouthed . lib of incomplete antenna are encircling 70% and SO% of referenced antenna sire. As the incomplete antenna has a compound extent ce dual ligament agency, it obtain be eligible ce useful vehicular inconstant descobble antenna applications.
Refereces

R. Kronberger, H. Lindenmcier, L. Reiter, J. Hapf, ” Multi index planar Invencd-F C r a Antenna ce Inconstant Phsingle andGPS,”2714p-Z717p,AP converse. 1999 3530
I. Y. Wu and K. L. Wong, “Span inlegraled stacked shorted cobbleantennas ce DCSiGPS agencys,” Micra brandish Opt. Techno1 . Len. , Vol. 30. July, 2001.
 S. Reed, L. Desclar, C. Terref, and S. Toutain, “Cobble Antenna Extent Contraction By Means Oflnductive Slots,” Micro brandish Opt. Teehnol. Len. ,Vol29. Apri, 2001.
J. Y. Wu and K. L. Wong, “Single-recaggravate Clear-accentuation Microstip Antenna wilh lruncated comers ce Compound ~ircularpolarization Agency,” Electronics lea. , Vol. 34, May,1998.
W. S. Chen, C. K. Wu, and K. L. wong. I’ Newlight Compound Roundly polarized Clear Microstrip Antennq” IEEE Trans. ,Antennas Propagat. , Vol. 49, March, 2001,

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