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Symmetry Versus Balance in Balancing Networks for Dipolar Antennas

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Symmetry Versus Balance in Balancing Networks for Dipolar Antennas University of Texas Rio Grande Valley ScholarWorks @ UTRGV Electrical and Computer Engineering Faculty Publications and Presentations College of Engineering and Computer Science 4-2020 Symmetry Versus Balance in Balancing Networks for Dipolar Antennas James McLean Heinrich D. Foltz The University of Texas Rio Grande Valley, [email protected] Follow this and additional works at: https://scholarworks.utrgv.edu/ece_fac Part of the Electrical and Computer Engineering Commons Recommended Citation J. S. McLean and H. D. Foltz, "Symmetry Versus Balance in Balancing Networks for Dipolar Antennas," in IEEE Transactions on Electromagnetic Compatibility, vol. 62, no. 4, pp. 1406-1418, Aug. 2020, doi: 10.1109/TEMC.2020.2978445. This Article is brought to you for free and open access by the College of Engineering and Computer Science at ScholarWorks @ UTRGV. It has been accepted for inclusion in Electrical and Computer Engineering Faculty Publications and Presentations by an authorized administrator of ScholarWorks @ UTRGV. For more information, please contact [email protected], [email protected]. Symmetry vs. Balance in Balancing Networks for Dipolar Antennas James McLean1 and Heinrich Foltz2 1 TDK R&D Corp. Cedar Park, TX, USA [email protected] 2 University of Texas Rio Grande Valley Edinburg, TX, USA [email protected] Abstract—Imperfect balancing networks (baluns) have been avoid errors caused by a null in the transmission due to identified as a source of error in emission and site attenuation destructive interference between the line-of-sight (LOS) and measurements. For this reason performance tests have been ground-bounce rays [2], [5]. Symmetry problems with baluns developed to characterize the symmetry of baluns. We draw a distinction between symmetry and balance as they relate for vertically-polarized measurements on OATS were first to baluns and describe both quantitatively in terms of 3-port noticed by M. J. Alexander and this approach for symmetry network parameters. It is shown that a symmetric balun alone testing was originally developed at NPL [6]–[9]. does not necessarily eliminate common-mode (CM) current on The purpose of this paper is to address the operation of the feed transmission line. Common-mode current on the feed the balun as it pertains to symmetry and to draw a distinction transmission line is minimized by use of a current balun. However, for a given implementation such as a transmission- between balance and symmetry. Strictly speaking, it is anti- line transformer, some types of baluns are more difficult to symmetry that is required. If phase sensitive detection is em- implement than others and an imperfect, asymmetric current ployed the ideally anti-symmetric antenna/balun combination balun may perform worse than another type of balun (e.g. would provide identical insertion loss when inverted but 180 ◦ voltage) which is more symmetric. The case of a vertically- difference in insertion phase. Nevertheless, we will use the polarized biconical antenna situated over a ground plane and driven from a coaxial feed line via a balun is examined for three term symmetry here as the interpretation seems clear. As will symmetric baluns: a voltage balun, a current balun, and a 180◦ be seen a symmetric balun does not necessarily eliminate CM power divider. It is shown that although all three baluns are current on the feed transmission line. We note that in order symmetric, only the current balun maintains the dipolar pattern for the two sets of insertion loss data to be identical, it is only under the asymmetrical influence of the ground plane. necessary that the balun (which is inverted) is symmetric. This Index Terms—Balancing network (balun), antenna symmetry, site attenuation (SA), biconical antenna, dipole antenna, hybrid is still true even if phase sensitive detection is used. That is, current balance is not requisite for the two sets of insertion I. INTRODUCTION loss data to be identical and for the insertion phase to change by 180◦ when the AUT is inverted. Therefore, we seek to This paper is an extended version of a paper presented at concretely define the term “symmetric” as it applies to baluns. the 2019 IEEE International Symposium on Electromagnetic As has been noted, a symmetric or dipolar antenna driven Compatibility in New Orleans [1]. Several contemporary stan- from a coaxial feed transmission line and operated over a dards for electromagnetic compatibility call for symmetry tests ground plane can, in some cases, be rigorously represented on dipolar antennas driven from coaxial transmission line via by a 3-terminal, 2-port network [10]. This is particularly true balancing networks (baluns) such as biconical antennas and when the balun is a shielded 3-port and the physical location tuned dipoles [2]–[4]. Both of the ANSI- and CISPR-mandated of these terminals can be taken as shown in Fig. 2 so that tests call for an antenna-to-antenna transmission or insertion the terminals and ports satisfy the rigorous definitions of loss measurement to be made over an open area test site such [11]. The 3-terminal, 2-port load representing the antenna (OATS) between the antenna under test (AUT) and (usually) and the exterior of balun and feed transmission line can then a known-good reference antenna with the two antennas in take the form of a T/Y or Π/Δ network as shown in Fig. 3. vertical polarization as shown in Fig. 1. In these tests the As is noted and supported with measurements in ref. [10], AUT is typically the receive antenna. The measurement is this 3-terminal representation is asymmetric in the case of then repeated with the AUT inverted (rotated 180 ◦ about a vertical dipole over a ground plane. That is, in Fig. 3 its bore-sight axis) and the two sets of insertion loss data YA = YC and ZA = ZC. Only a true current balun will are compared. Scanning is sometimes employed in order to drive or force balanced currents in this asymmetric situation. This paper is for the Special Section and is an expanded version from the This approach might be less than satisfying, but what can 2019 IEEE International Symposium on EMC and SIPI in New Orleans be stated with some assurance is that a 2-terminal, isolated Port Reference Plane Radiating Element Balun Antenna Equivalent Circuit I 2 T2 + V 2 ZA Not to Scale - ZB T 0 - Co axi al Co n n ect o r s V 3 ZC + Co axi al I3 T Input/Output 3 Coaxial Transmission Line Port 2 T2 Sh i el d ed So u r ce/ 3-port Shielded T Rec ei v er Bal un 0 Antenna Equivalent Circuit Co axi al Port 3 T Port 1 3 Balun Input/Output YA I2 T2 + Bul khead V Shields Connected Here -2 T 0 - YB V3 + I3 T3 Y Radiating Element C Fig. 3. Equivalent T and Π networks for the terminals shown in Fig. 2. The terminals and ports correspond to those in Fig. 2. The positive current direction Fig. 2. Biconical antenna driven by 3-port, shielded, “connectorized” balun: for each port is into the port of the balun and thus out of the equivalent network The location of the three terminals for a sound physical port representation of the antenna. are indicated by T0, T2,andT3 [11]. Port 2 comprises terminals T2 and T0 while port 3 comprises terminals T3 and T0. with the following form: ⎡ ⎤ ⎡ ⎤ ⎡ ⎤ ⎡ ⎤ I1 V1 AB−B V1 ⎣ ⎦ ⎣ ⎦ ⎣ ⎦ ⎣ ⎦ I2 =[Y ] V2 = BC−C . V2 , I3 V3 −B −CC V3 (1) impedance, i.e. YA = YC =0, representation of the above- described antenna is very much inadequate. The 2-terminal where A, B,andC are complex, frequency-dependent ad- load representation itself enforces current balance and thus, mittances. Note that for a lossless 3-port network, these ad- cannot represent imperfect operation of the balun. This is true mittance parameters would be purely imaginary and thus, the even for horizontal polarization where the load is symmetric, matrix could be written with a scalar factor of j multiplying a i.e. YA = YC =0 . In this case, a finite common-mode purely real matrix. Also note that the corresponding impedance −1 antenna input impedance, ZCM =(YA + YC ) , will allow matrix for the lossless 3-port network would also be purely an asymmetric balun to drive unbalanced currents. Of course, imaginary. One can see from Eqn. 1 that I 3 = −I2 for any load the isolated, 2-terminal impedance will not. configuration. If the balun of the vertically-polarized antenna referred to earlier has the admittance matrix representation A rigorous definition of balun is prerequisite to a formal in Eqn. 1, no amount of coupling to the ground including discussion of balance and symmetry. We define a balancing the tip of the lower element making galvanic contact to the network or balun as a 3-port network with port 1 being ground can cause the balun output currents to be unbalanced. the input that enforces balance of one of a pair of power- An ideal voltage balun would naturally be represented by an conjugate variables [10], [12] (e.g. voltage, current, power- impedance matrix with the same form as Eqn. 1. However, normalized wave amplitude) at the output ports, ports 2 and 3. one might notice that the matrix in Eqn. 1 is singular and thus The other power-conjugate variable at each output port is then the impedance matrix representation of a current balun does determined by the load. For example, voltage can be balanced not exist. The 180◦ power divider (which balances outgoing at ports 2 and 3 leaving the currents to be determined by the power-normalized wave amplitudes at ports 2 and 3) would 3-terminal load or currents can be balanced at ports 2 and 3 be represented by a scattering matrix with the same form.
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