Radio frequency properties of a case for a communications device

A case for a portable Radio Frequency (RF) communications device having an RF antenna, the case comprising:

• a base;
• and
• a plurality of walls, extending from the base;
• the base and the plurality of walls having requisite dimensions to receive a portable Radio (RF) having an outer surface with a first portion and a second portion, a first dielectric characteristics adjacent to the first portion having a relatively low effect on a frequency characteristic of an RF antenna arrangement;
• and a second dielectric characteristics adjacent to the second portion having a relatively high effect on the frequency characteristic of the RF antenna arrangement,
• wherein, when the communications device is disposed in the case, the case is adapted to cover part of the first portion of the communications device so as to cause:
• i. a dielectric parameter adjacent a part of the first portion of the communications device to be relatively high, and
• ii. a dielectric parameter adjacent the second portion to be relatively low;
• wherein at least a part of the base to be adjacent the first portion of the communications device when the communications is disposed in the case, includes a casing material having a relatively high dielectric parameter, which thereby causes the dielectric parameter adjacent the first portion of the communications device to be relatively high, when the communications device is disposed in the case;
• wherein the base and/or plurality of walls includes the casing material adapted to be adjacent the second portion of the communications device when the communications device is disposed in the case, wherein the casing material covers the second portion of the communications device when the communications device is disposed in the case, to thereby produce the relatively low dielectric parameter adjacent the second portion of the communications device, when the communications device is disposed in the case;
• and
• wherein the base and/or plurality of walls to be adjacent the secondary portion of the communications device when disposed in the case, are adapted to be spaced from the secondary portion via a gap between the casing material and the second portion, to thereby produce the relatively low dielectric parameter adjacent the second portion when the communications device is disposed in the case.