Input admittance of linear antennas driven from a coaxial line

In two cases of a linear a n te!1nadriven from a eoax ialline, it is sho wn t hat t he a pparent terrmn a l a dllll ttance to t h e coax1alltne can be add ltively sep arated in to two p ar ts when t he t r a nsverse dimensions a re s mall compared with t he wavelengt h.On e of t hese two parts de p e nd ~ o nly o n t he wavelen gt h a nd t he dimensions of t he a nte nna, while t h e oth er p art can be mterpreted as a capaCItance t hat d epends only on t h e radii of t h e coaxia l line .This cap acItance may be found exactly from t he solu t ion of a n in tegral equation in t h e sense t h at furth er correction s cannot be interpreted simpl y as a capacitance.'